Title of Invention

A NON-INTERACTING DRUG-COMBINATION FOR TREATING HYPERLIPIDAEMIA IN MAMMALS

Abstract

The invention concerns safe non-interacting drug combination of a 3-hydroxy-3-methylglutaryl coenzyme A(HMG-CoA)reductase inhibitor,which is(E)-7-[4-(4-fluorophenyl)-6-isoprophyl-2-[methyl(methylsulfonyl)amino]pyrimidin-5-yl] (3R,5S)-3,5-dihydroxyhept-6-enoic acid or a pharmaceutically acceptable salt thereof (the Agent) and a drug which is either an inducer, inhibitor or a substrate of cytochrome P450,in particular cytochrome P450 isoenzyme 3A4. Particular combination are useful in treating hyperlipidaemia in humans who are receiving immunosuppressive chemotherapy. A preferred combination is the Agent and a fibrate drug, the use of such a combination in treating hyperlipidaemia in mammals, and medicaments containing such a combination for use in such treatments.

Full Text

FORM 2 THE PATENTS ACT 1970 [39 OF 1970] & THE PATENTS RULES, 2003 COMPLETE SPECIFICATION [See Section 10; rule 13] "A NON-INTERACTING DRUG-COMBINATION FOR TREATING HYPERLIPIDAEMIA IN MAMMALS " SYNGENTA LIMITED (formerly ZENECA LIMITED), a British company of Syngenta European Regional Centre, Priestly Road, Surrey Research Park, Guildford, Surrey, GU2 7YH, England and SHIONOGI & CO. LTD., a Japanese company of 1-8 Doshomachi 3-chome, Chuo-ku, Osaka 541-0045 Japan, The following specification particularly describes the invention and the manner in which it is to be performed: The invention concerns safe non-interacting drug combinations of a 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitor, which is (E)-7-[4-5 (4-fluorophenyl)-6-isopropyl-2-[methyl(methylsulfonyl)amino]pyrimidin-5-yl] (3R,5S)-3,5-dihydroxyhept-6-enoic acid or a pharmaceutically acceptable salt thereof (the Agent) and a drug which is either an inducer, inhibitor or a substrate of cytochrome P450, in particular cytochrome P450 isoenzyme 3A4. Particular combinations are useful in treating hyperlipidaemia in humans who are receiving immunosuppressive chemotherapy. A preferred 10 combination is the Agent and a fibrate drug, the use of such a combination in treating hyperlipidaemia in mammals, and medicaments containing such a combination for use in such treatments. Hypercholesterolaemia is one of the strongest risk factors for atherosclerosis which is 15 associated with coronary artery disease (including angina pectoris, myocardial infarction and mortality), stroke (including cerebro vascular accident and transient ischaemic attack) and peripheral arterial occlusive disease. Several types of hypercholesterolaemia exist. The magnitude of hypercholesterolaemia may have consequences for the therapy, but in general, any reduction of elevated plasma cholesterol levels is generally accepted to result in an 20 improvement of the risk profile. Dietary improvement and increased exercise are essential first steps and should continue even if drug therapy is instituted, but the therapeutic potential of drug therapy is significantly larger. Several types of drug therapy for hypercholesterolaemia are currently available. Guidelines exist for the treatment of hypercholesterolaemia for example, American Heart Association (AHA) (Anon 1988), 25 Updated Sheffield treatment tables (Heart (1998) 80 Supp.2 S1-S29) and Recommendations of the task force of the European Society of Cardiology Guidelines (Pyorala 1994). HMG-CoA reductase inhibitors are the most widely used prescription medication for the treatment of hypercholesterolaemia. By inhibiting the rate-controlling step in cholesterol 30 biosynthesis, these agents effectively lower the plasma concentrations of atherogenic particles containing cholesterol such as low-density lipoprotein (LDL-C) and very low-density (VLDL-C). Partial inhibition of hepatic cholesterol synthesis causes up-regulation hepatic membrane LDL-C receptors which are responsible for the clearance of LDL-C from ihe circulation. In addition, reduced hepatic synthesis of cholesterol is thought to result in a modest reduction in the secretion of VLDL-C particles by the liver. Clinical trials with certain HMG Co A-reductase inhibitors, such as in the Scandinavian Simvastatin Survival Study, confirm a reduction in cardiovascular morbidity and mortality with such agents, and may even promote regression of atherosclerotic vascular lesions. Various HMG Co A-reductase inhibitors are marketed, and are collectively referred to as "statins". Despite the impressive benefits of statin therapy, less than optimal therapeutic results may be achieved in some subjects, particularly in the more severe classes of hypercholesterolaemia. This can be due to the occurrence of reversible increases in liver transaminase levels at higher dose levels of statins as well as differences in efficacy between different statins. Clinically important (>3 times upper limit of normal [ULN]) elevations in serum alanine aminotransferase [ALT]) have been reported for atorvastatin in 0.8 per cent of patients at low doses of atorvastatin and higher at raised doses (European Summary of Product Characteristics [SmPC] for atorvastatin [Lipitor™]). In all cases the effect is dose-related and reversible. In general it is the incidence of ALT increases which limits dose escalation of statins rather than a limit to further increases in efficacy. The first generation statins (such as lovastatin, pravastatin and simvastatin - prodrug derivatives of fungal metabolites - and fluvastatin) are categorised in that they achieve only a limited cholesterol lowering affect before the dose administered is limited by elevations in serum ALT. Second generation "superstatins" (such as atorvastatin - synthetic compounds- structurally distinct from first generation compounds) inhibitors are categorised in that they lower cholesterol levels to a much higher degree than the earlier first generation of statins before their dose is limited by serum ALT levels. Atorvastatin has been successful over the first generation of statins. Since its launch in the USA atorvastatin has reached sales in 1998, doubling from 1997, of $2.2 billion, capturing 38% of new prescriptions for cholesterol- lowering agents in the US and is now the most widely prescribed hypolipidaemic agent in the US (Warner-Lambert 1998 annual results). An additional adverse event, reported for statins in general, is myopathy, defined as symptoms of muscle pain, tenderness and weakness, with creatinine kinase (CK) values >10 x Upper Limit of Normal (ULN). This adverse event is not considered to be dose related, and in addition the adverse events are potentially more serious, and consequently more problematical. In severe cases this can lead to rhabdomyolysis, which is a rare life threatening condition sometimes associated with renal failure. The incidence of raised CK levels (>10 x ULN - on 2 occasions at least 1 week apart with symptoms = myositis according to FDA) for statins has been reported as 3.1 per cent. (SmPC for atorvastatin). Myopathy and rhabdomyolysis have been particularly associated with taking a statin in combination with gemfibrozil, niacin, cyclosporin or erythromycin, (Hunninghake H. Et al. Current Opinion in Lipidolgy (1992), 3, 22-28) which are all substrates for P450 isoenzyme 3A4. The increase in adverse events associated with taking a combination of a statin drug with one of the other drugs mentioned above is probably due to a drug:drug interaction likely related to the metabolism of most statins also by the same cytochrome P450 isoenzyme 3A4. Therefore when a drug which is also metabolised by P450 3A4 is administered alongside a statin which also is metabolised by P450 3A4, the side effects discussed above are more likely to occur. Increase in the side effects, such as muscle damage, is thought to be due to elevated statin levels in muscle cells inhibiting famesylation and geranylgeranylation of muscle proteins . Elevated levels of statins may be caused by any drug which affects P450 3A4. Therefore, currently on the labels of all commercially available statins the use of the statin in combination with drugs that are metabolised by P450 3 A4 is not recommended and is contraindicated in certain cases. Nearly all drugs are metabolised to some degree in the human, generally to a less lipid soluble compound which is more easily excreted by the kidney or in liver bile. The liver is the major site of drug metabolism and many drug metabolising enzymes occur at high concentration in the endoplasmic reticulum (which form microsomes upon homogenisation) of liver parenchymal cells (hepatocytes). Cytochrome P450 represents a major class of drug metabolising enzymes and exists as a family of isoenzymes found in hepatic microsomes. Six specific P450 isoenzymes are responsible for the metabolism of most of the commonly used 70475 drugs, namely P450 1A2,2C9, 2C19, 2D6,2E1 and 3A4. A major disadvantage of the currently available "super statin" , atorvastatin, is that atorvastatin is metabolised by cytochrome P450 enzymes, in particular 3A4, which may cause drug interactions with other drugs which are inducers, inhibitors or substrates of the same P450 enzyme which metabolises atorvastatin. All of the first generation of statins are metabolised by P450 also. However, the rate of metabolism of pravastatin is sufficiently low that it is considered less susceptible to clinically relevant drug interactions. Therefore despite the lower efficacy of pravastatin, in its currently available doses, at reducing hypercholesterolaemia this is currently the statin of choice in combination with other drugs where the possibility of drug interactions is unacceptably high. (E)-7-[4-(4-fluorophenyl)-6-isopropyl-2-[methyl(methylsulfonyl)amino]pyrimidin-5-yl] (3R,5S)-3,5-dihydroxyhept-6-enoic acid or a pharmaceutically acceptable salt thereof (the calcium salt of which is disclosed in Figure 1 below), hereinafter referred to as the Agent, is also a statin and belongs to the class of what is now starting to be called a "superstatin". The Agent is disclosed in European Patent Application, Publication No. 0521471, and in Bioorganic and Medicinal Chemistry, (1997), 5(2), 437-444 as an inhibitor of HMG-CoA reductase which is a major rate-limiting enzyme in cholesterol biosynthesis. The Agent is described as useful in the treatment of hypercholesterolaemia, hyperlipoproteinaemia and atherosclerosis. The Agent is not metabolised by cytochrome P450 3A4 and therefore does not possess the same potential for drug interaction shared with the currently available "super statin", i.e. atorvastatin, or any of the other currently available statins. Therefore we present as a feature of the invention a non-interacting drug combination comprising a HMG CoA reductase inhibitor, which is the Agent, and a drug which is an inhibitor, inducer or substrate of P450 in particular, isoenzyme 3A4. 70475 As a further feature of the invention we present use of a HMG CoA reductase inhibitor, which is the Agent, in the preparation of a medicament for use in combination therapy with a drug which is an inhibitor, inducer or substrate of P450, in particular, isoenzyme 3A4. As a further feature of the invention we present use of a drug which is an inhibitor, inducer or substrate of P450, in particular, isoenzyme 3A4 in the preparation of a medicament for use in combination therapy with a HMG CoA reductase inhibitor, which is the Agent. As a further feature of the invention we present a pharmaceutical formulation comprising the Agent, a drug which is an inducer, inhibitor or substrate of P450 isoenzyme 3A4 and a pharmaceutically-acceptable diluent, carrier or adjuvant. As a further feature of the invention we present a pharmacy pack comprising a first drug which is the Agent and a second drug which is an inducer, inhibitor or substrate of P450 isoenzyme 4A4. By the term "inducer of P450 " we mean a drug which increases the rate at which a P450 enzyme, in particular isoenzyme 3A4, metabolises a substrate, for example by increasing the activity of the P450 enzyme, decreasing the rate of biological inactivation of the P450 enzyme or by increasing the rate of transcription of the P450 gene. By the term "inhibitor of P450" we mean a drug which lowers the rate at which a P450 enzyme, in particular isoenzyme 3 A4, metabolises a substrate, for example by lowering the activity of the P450 enzyme or by lowering the rate of transcription of the P450 gene. By the term "substrate of P450" we mean a drug which is metabolised by a P450 enzyme, in particular isoenzyme 3A4. By the term "non-interacting drug combination" we mean a drug combination for which there is no adverse affect to the patient by its administration through the mechanism of drug metabolism by cytochrome P450 isoenzyme 3 A4. It is recognised that in certain instances a 70475 drug interaction may nevertheless occur between two such drugs when in combination through a completely different mechanism not involving drug metabolism, such as affecting drug absorption. Whether a drug is an inhibitor, inducer or substrate of a P450 enzyme can be easily determined by procedures known to the skilled person. Such procedures may involve the exposure of a radiolabelled drug to hepatocytes or hepatocyte microsomes or isolated P450 enzyme and the use of analytic techniques, such as HPLC, in determining metabolite formation. A specific procedure is described herein. By the term "combination" we mean either that the Agent and the drug of the combination are administered together in the same pharmaceutical formulation or that the Agent and the drug are administered separately. When administered separately components of the combination may be administered to the patient simultaneously or sequentially. We have found that the Agent is not metabolised significantly by the major cytochrome P450 isoenzymes 1A2, 2C9, 2C19, 2D6 and 3A4. This is a further feature of the invention. Preferred non-interacting combinations of the invention include those in which the Agent is combined with a drug which is also involved in lowering cholesterol and is also an inducer, inhibitor or substrate of P450 3A4. Examples include fibrates, such as bezafibrate, clofibrate, ciprofibrate, fenofibrate and gemfibrizol (preferably fenofibrate), and niacin. Specific embodiments of this preferred feature are described in Section B below. Preferred non-interacting combinations of the invention include those in which the Agent is combined with a drug which is involved in treating cardiovascular conditions and which is also an inhibitor, inducer or substrate of P450 3A4. Examples include digitoxin, diltiazem, losartan, nifedipine, quinidine, verapamil and warfarin. Preferred non-interacting combinations of the invention include those in which the Agent is combined with cyclosporin and /or tacrolimus (FK506) and therefore has utility in treating elevated cholesterol levels in patients who are about to, or have recently undergone, a transplantation operation. Specific embodiments of this preferred feature are described in Section A below. Preferred patients in which the combination of the invention is to be administered are those who suffer from myopathy or rhabdomylosis or who have already been found to suffer from myopathy or rhabdomylosis when treated with HMG Co A reductase inhibitor which is metabolised by P450 3 A4, for example atorvastatin, simvastatin and lovastatin. Other features of the invention include those described above wherein the Agent is used at doses of 5 to 80mg per day. When a dose range of 5 to 80 mg per day is referred to herein for the Agent other particular dosage ranges, which are further independent aspects of the invention, include (as appropriate) 10 to 80 mg per day, 10 to 60 mg per day, 10 to 40 mg per day, 5 to 40 mg per day, 5 to 20 mg per day, 10 to 20 mg per day, 20 to 60 mg per day, 20 to 40 mg per day and 40 to 60 mg per day. Particular dosages are 5, 10, 20, 40 and 80mg per day. A particularly suitable starting dose of the Agent in the methods referred herein is 5 to 10 mg per day, especially 10 mg per day. P450 3A4 substrates include; acetominophen, aldrin, aflentanil, amiodorane, astemizole, benzphetamine, budenoside, carbamazepine, cyclophosphamide, cyclosporin, dapsone, digitoxin, ditiazem, diazepam, erthromycin, etoposide, flutamide, hydroxyarginine, ifosphamide, imipramine, lansoprazole, lidocaine, lovatidine, losartan, lovastatin, midrazolam, nifedipine, omeprazole, quinidine, rapamycin, retenoic acid, steroids, tacrolimus, teniposide, theophyline, toremifene, triazolam, troleandomycin, verapamil, warfarin, zatosetron and zonisamide. P450 3A4 inhibitors include; clotrimazole, ethinylestradiol, gestodene, itraconazole, ketoconazole, miconazole, diltiazem, naringenin, erthromycin, cyclosporin and triacetyloleandomycin. 70475 P450 3A4 inducers include; carbamazepine, dexamethasone, phenobarbital, phenytoin, rifampin, sulfadimidine, sulfinpyrazone and triacetyloleandomycin. Examples of other P450 inducers, inhibitors or substrates include those mentioned in Drug Metabolism Reviews (1997) Vol 29, Issue 1+2, pages 413-580, Rendic, S. and Di Carlo, F. J. "Human cytochrome P450 enzymes,: A status report summarising their reactions, substrates, inducers and inhibitors". Dosages of the Agent may be administered according to the cholesterol lowering effect desired from a range of 5 to 80 mg per day in any number of unit dosages. Dosages of the drug which is an inducer, inhibitor or substrate of P450 3A4 are those which are advised for each drug, or which are commercially available. Advantageously, due to the lack of interaction at the level of P450 3A4, the skilled person may dose the Agent with a drug which is an inducer, inhibitor or substrate of P450 3A4 with out needing to make any adjustments. The dose ranges and dosages described above are further independent features of the invention. Preferably the Agent is bis[(E)-7-[4-(4-fluorophenyl)-6-isopropyl-2- [methyl(methylsulfonyl)amino]pyrimidin-5-yl](3R,5S)-3,5-dihydroxyhept-6-enoic acid] calcium salt (illustrated in figure 1). Experimental The experiment below is used to determine the in vitro metabolic fate of [14C]- labelled Agent in human hepatocytes and, in addition, to determine the specific P450 isozymes involved in [14C]- labelled Agent metabolism, if any. The latter experiment involves an investigation of the effects of P450 selective chemical inhibitors (see Table 1) on the metabolism of [14C]-labelled Agent. COMPOUND: [,4C]- labelled Agent. 70475 Chemical name: Bis [(E)-7-[4-(4-fluorophenyl)-6-isopropyl-2- [methyl(methylsulfonyl)amino]pyrimidin-5-yl](3R,5S)-3,5-dihydroxyhept-6-enoic acid] calcium salt Isomer: 3R,5S,6E Stereoisomer Molecular weight: 1001.16 (Ca salt) Formulation ingredients: The labelled Agent is dissolved in water to produce a solution suitable for addition to the incubates. TISSUE SOURCE Human liver, suitable for the preparation of microsomes and hepatocytes, obtained from The International Institute for the Advancement of Medicine (Exton, USA). Human hepatocytes may, in addition, be obtained from Biowhittaker Ltd. or United Kingdom Human Tissue Bank (Leicester, England). EXPERIMENTAL PROCEDURES (1) METABOLISM OF [14C]- LABELLED AGENT BY HUMAN HEPATOCYTES [14C]- labelled Agent (1 uM or higher concentration if required for analytical sensitivity) was incubated with hepatocytes in culture obtained from two human organ donors. Cultures were terminated with ethanol after 0, 6, 24 and 48 hours of incubation and stored at approximately -20°C until analysed. The metabolic competence of the hepatocytes was confirmed at the time of incubation by examining their ability to metabolise [14C]-ethoxycoumarin (25 uM); aliquots were removed into methanol at the same time points as for the test compound. Following incubation of [14C]-ZD4522 with hepatocytes, metabolite profiles were generated by High Performance Liquid Chromatography (HPLC). The ability of hepatocytes to metabolise [14C]-ethoxycoumarin was confirmed by HPLC. ASSESSMENT OF DATA Data generated was assessed with regard to the following:- 0475 (1) Assess whether human hepatocytes metabolise [14C]- labelled Agent. (2) Quantitate the amount of each metabolite formed. (2) ENZYMES INVOLVED IN METABOLISM OF THE AGENT [14C]- labelled Agent (at an appropriate concentration) was incubated with human hepatic microsomes in the absence and presence of selective P450 inhibitors (see Table 1). Similar incubations of [14C]- labelled Agent with individual heterologously expressed P450 isoenzymes was also performed. Incubations were terminated by the addition of an appropriate organic solvent. Metabolite profiles of the incubates are generated by HPLC. Table 1 Selective chemical inhibitors of P450 isozymes P450 isozyme Selective inhibitor 1A2 Furafylline 2C9 Sulphaphenazole 2C19 Omeprazole 2D6 Quinidine 3 A4 Ketoconazole ASSESSMENT OF DATA Data generated during this study was assessed with regard to the following:- (a) The rate and extent of metabolism of [l4C]- labelled Agent. (b) The ability of the selective P450 inhibitors to decrease the metabolism of [14C]- labelled Agent was compared in order to determine the isozyme(s) involved in the metabolism of [14C]- labelled Agent. The ability of individual expressed P450 isoforms to metabolise [14C]- labelled Agent was assessed to aid determination of the P450 isozyme(s) involved in the metabolism of [14C]- labelled Agent. 70475 (c) These in vitro data can be used to predict the variability of the pharmacokinetics of the Agent in the population and the likely effects on the pharmacokinetics of the Agent during co-administration with known P450 enzyme inhibitors/inducers. It was found that the Agent was not significantly metabolised by whole hepatocytes and that this was inhibited by sulphaphenazole and omeprazole. FOR TREATING HYPERLIPIDAEMIA AND ASSOCIATED CONDITIONS IN POST TRANSPLANT PATIENTS RECEIVING IMMUNOSUPPRESSIVE THERAPY. Two common drugs used in suppressing the human immune system, cyclosporin and tacrolimus (formerly called FK506), are known to be metabolised by cytochrome P450 3A4. In particular cyclosporin is also a known inhibitor of P450 3A4 and is therefore likely to reduce the metabolism of any other drug which is metabolised by P450 3A4. Therefore where immunosuppressive therapy is prescribed, such as with the drugs cyclosporin and tacrolimus (especially cyclosporin), the attendant physician must be cautious as to any other therapy which may be jointly presented to the patient in combination. Immunosuppressive therapy is most commonly used before, during and after human transplant operations. In particular with cardiac transplants the attendant physician may wish to also place the patient on statin drug therapy to reduce future incidents of coronary heart disease, stroke, peripheral arterial occlusive disease or peripheral vascular disease, particularly in patients with elevated cholesterol or in normolipidaemic patients with other risk factors associated with heart disease. In particular within this special patient group (human transplant patients), the patients are at high risk of developing accelerated atherosclerosis in the transplant organ in an aggressive fashion and within a short period of time due, in part, to the surgical damage to the blood vessels during transplantation, any previously underlying untreated conditions and the immunosupressive therapy. Hyperlipidaemia is common after transplantation even in patients who did not suffer hyperlipidaemia prior to transplantation, incidence 60-80% of recipients. 70475 It is known that certain immunosuppresive drugs, such as steroids, cyclosporin and tacrolimus, raise cholesterol levels in patients (Wierzbicki AS (1999) IJCP 53 (1) 54-59). In addition cyclosporin and tacrolimus may raise the levels of fibrinogen and lipoprotein (a) in the patient, further accelerating the progression of atherosclerosis in the transplant patient (Hohaye H, Clin.Transplant (1997) 11, 225-230 and Hilbrands LB, J.Am.Soc.Nephrol (1995) 5, 2073-2081). This unusually accelerated atherosclerosis is present in about 20% of heart transplant patients at 1 year and 40-65% at 5 years (Chang G. Et al. American Heart Journal (1998), 136(2), 329-334). The incidence of accelerated atherosclerosis has been reported as causing a 1-18% incidence of CHD at one year and 20-50% incidence of CHD at 3 years in cardiac transplant patients (Erdoes LS, J.Vasc.Surg. (1995) 22, 434-440). Lovastatin, pravastatin and simvastatin have all shown to lower cholesterol levels in heart transplant patients. In a placebo controlled study pravastatin increased survival of transplant patients by 1 year and significantly reduced the incidence of haemodynamic organ rejection. Because of the lower incidence of serious drug interaction with the immunosuppresive therapy pravastatin is currently the statin drug of choice in post transplant treatment regimes. However, as discussed above, pravastatin does not lower lipid/cholesterol levels to such a great extent as, for example, atorvastatin. We have discovered that the Agent is extremely effective at treating hypercholesterolaemia in patients following transplantation and that the Agent is not metabolised by cytochrome P450 isoenzyme 3A4. Therefore we have found through the use of the Agent in a clinical study that the Agent may be conveniently dosed to patients who are undertaking immunosuppressive therapy without any clinically significant side effects associated with the concomitant dosing of the Agent and the immunosuppressive drug(s) and, in addition, also achieve much higher levels of cholesterol lowering than has previously been achieved, such as by the use of pravastatin. We present as the first feature of the invention a method of providing safe non-interacting cholesterol lowering therapy to a human patient undertaking immunosuppressive chemotherapy which method comprises administering to the patient the Agent. 70475 Particular patients undertaking immunosuppressive chemotherapy who may benefit from the method of the invention are those who: 1) suffer primary (type IIa) hypercholesterolaemia (LDL-L > 135 and TG 2) suffer combined (type IIb) hypercholesterolaemia (LDL-C> 135 and TG>200); 3) patients with established CHD or other atherosclerotic disease, such a PVD, stroke or peripheral arterial occlusive disease; 4) patients who are at high risk of developing CHD or other atherosclerotic disease, such as described above, because of a combination of risk factors. The term "high risk" is defined in the "Recommendations of Second Joint Task Force of European and other Societies on Coronary Prevention", (Wood, D. et. al. European Heart Journal, Atherosclerosis and Journal of Hypertension 1998) as absolute CHD risk of > 20% over 10 years or will exceed 20% if projected to age 60 years. Whether a patient is at high risk or not may be determined by the charts which accompany the above recommendations and which charts are incorporated herein by reference. For example a male patient in his 40s who smokes and has a systolic blood pressure of 180 mm Hg or higher and a total plasma cholesterol concentration of 7 mmol/L or higher will be classified as high risk. Similarly other guidelines for reducing risk factors may be applied such as those described in; a) JAMA, June 16, 1993-Vol 629, No.23, Pages 3015-3023 - "Summary of the NCEP Adult Treatment Panel II Report" - specifically Figure 1. Page 3018-3019 which is incorporated herein by reference. b) Post Graduate Medical Journal 1993; 69(811): 359-369 - "Management of hyperlipidaemia: guidelines of the British Hyperlipidaemic Association"- specifically Table V and Table VI which are incorporated herein by reference. 70475 c) Heart 1998; 80 Supplement 2:S1-S29 - "Joint British recommendations on prevention of coronary heart disease in clinical practice" - specifically Figure 1 on pages S4-S5, which is incorporated herein by reference. d) The Lancet 1995; December 2, Vol.346,1467-1471 - "Sheffield risk and treatment table for cholesterol lowering for primary prevention of coronary heart disease" - specifically the Table appearing at page 1468, which is incorporated herein by reference. 5) patients who suffer type I or II diabetes; 6) patients who are about to or have already undertaken a heart transplant; The statin therapy may be administered so as to achieve in the patient undertaking immunosuppressive chemotherapy. 15 1) A reduction in the internal thickness of coronary artery atheroma of > 30% as measured by IVUS. 2) A reduction of LDL-C of at least 30, 40, 50%. 3) A maintenance or increase of HDL-C of at least 5, 10, 15%. 4) A change in any of the above values better than pravastatin at a similar dose and over the same period. As a further feature of the invention, and due also to the fact that the Agent is not metabolised to any significant extent by P450 isoenzymes, it is possible to administer, more safely than before, to a patient receiving immunosuppresive therapy a fibrate and the Agent. As discussed earlier the administration of a fibrate and a statin has previously been associated with a higher incidence of rhabdomyolysis and myopathy. In addition fibrate drugs do interact with cyclosporin due to both being metabolised by the same P450 isoenzyme. Therefore, the use of 70475 a statin and a fibrate drug in combination with immunosuppresive therapy was previously contraindicated due to the likelihood of possible serious interactions (Hunninghake 1992, Wanner C. Kidney Int. (1995) 52(suppl.), S60-S62; and Katznelson S. Contributions Nephrol. (1997) 120, 97-104). However, if possible, it would be advantageous to also administer a fibrate alongside a statin since fibrates are known to lower different lipoproteins than statins and therefore their combined pharmacology would be complementary in reducing even further the likelihood of CHD and other diseases mentioned above associated with the formation of atherosclerosis. Therefore the possibility of combining the Agent, which is not metabolised by P450 3 A4, with a fibrate and an immunosuppresive therapy offers the additional possibility of lowering cholesterol to a greater extent in such patients than previously achieved and more safely than could previously be achieved by the administration of a statin, a fibrate and an immunosuppresive drug. Fibrate drugs are thought to act through peroxisomal proliferating activator receptor-α (PP AR-a) and affect gene activation at a number of genes involved in atheroma. Patients on fibrate drugs show improved LDL subfraction distribution (reduced VLDL and raised HDL), reduced LDL and reduced triglyceride levels, and possible advantages through improving insulin sensitivity. Examples of fibrate drugs include, bezafibrate, ciprofibrate, fenofibrate and gemfibrozol. By use of the term "safe non-interacting statin therapy" we mean that the Agent is not metabolised by P450 3A4 and therefore does not affect the metabolism of the immunosuppresive therapy or vice versa. Diseases and conditions in which immunosuppressive therapy may be prescribed include, in addition to organ transplantation mentioned above, autoimmune diseases, including rheumatic disorders, such as, rheumatoid arthritis, osteoarthritis, lupus erthematosus; and other autoimmune disorders such as idiopathic thrombocytopenic purpura, autoimmune haemolytic anaemia and acute glomerulonephritis. 70475 The agent may be administered at the same time as the immunosuppressive chemotherapy, or if not at the same time within a short time period of administration of the immunosuppressive therapy, such as in the same day, within 6, 3, 2 or 1 hour. The Agent may be administered according to the cholesterol lowering effect desired from a range of 5-80 mg per day in any number of unit dosages, preferable once a day dosing. Ideal doses are 10, 20 and 40 mg once per day. Preferred doses are 20 and 40mg once per day. Particular immunosuppressive drugs which may be combined with the Agents are those which are metabolised by liver enzymes, such as by P450 3A4, and therefore are not likely to have a drug interaction with the Agent. Examples include those described above, cyclosporin and tacrolimus, as well as corticosteroids, which are also metabolised in the liver. Examples of corticosteroids include prednisone (especially used for organ transplantation). Preferably at least one of the immunosuppressive agents, if more than one agent is used, is either cyclosporin or tacrolimus, preferably cyclosporin. ■■■■-.# Accordingly the present invention relates to a non-interacting drug combination comprising a first drug, HMG-CoA reductase inhibitor, which is (E)-7-[4-(4-fluorophenyl)-6-isopropyl-2- rnethyl(rnethylsulfonyl)arnino]pyrirnidin-5-yl] (3R,5S)-3,5~dihydroxyhept-6-enoic acid or a pharmaceutically acceptable salt thereof and a second drug which is an inhibitor, inducer of substrate of P450 isoenzyme 3A4 of the kind such as herein described, with ratio percentages of first drug: second drug from between 0.25:99.75% w/w and 99.5:0.5% w/w. Accordingly the present invention relates to a pharmaceutical formulation comprising a non-interacting drug combination as claimed in any of the preceding claims, wherein it comprises (E)-7-[4-(4-fluorophenyl)-6-isopropyl-2-[methyl (methylsulfonyl) amino] pyrimidin-5-yl] (3R,5S)-3,5-dihydroxyhept-6-enoic acid or a pharmaceutically acceptable salt thereof, a drug which is an inducer, inhibitor or substrate of P450 isoenzyme 3A4 and a pharmaceutically-acceptable diluent, carrier or adjuvant of the kind such as herein described. Example The following non-limiting example is of a clinical trial to demonstrate the 20 performance of this aspect of the invention. 25 30 Title: Objectives: PROTOCOL A Double-blind, Parallel Group Study to Assess the Change in Coronary Artery Atheroma Burden Post Cardiac Transplantation as Measured via IVUS after 12 Months Dosing with the Agent versus Pravastatin The primary objective of the study is to measure change in maximal mean intimal thickness of the anterior descending coronary artery as assessed by intravascular ultrasonography (IVUS) (read centrally) after 12 months of treatment with the Agent or pravastatin. A change from 70475 10 15 20 25 Type and number of subjects: Trial treatment: Duration of treatment: baseline of>30% in intimal thickness is considered clinically significant. The secondary objectives of the study are to measure the effects on coronary artery atheroma burden and to compare effects of the Agent with the following assessments: • evidence of organ rejection as assessed by adverse event reports. • measurement of LDL-C, HDL-C, apoB, apoA-I, Lp (a) concentrations, ex vivo platelet aggregation, fibrinogen, PAI-I, and the concentrations of circulating markers of vascular inflammation. • comparison of lipid values after 52 weeks of treatment. • measurement of inflammatory markers after 52 weeks of treatment (HLA antigen VCAM/ICAM expression as assessed by biopsy). • to determine the drug"s safety and tolerability. Approximately 40 men and women (aged 18 years and older) post cardiac transplant with hypercholesterolemia and triglycerides Once daily doses of the Agent (10 mg) or pravastatin (10 mg) for two weeks, then titration of dose to 20 mg of the Agent or pravastatin 20 mg. After 4 weeks the dose should be titrated up to 40 mg of the Agent or 40 mg pravastatin. Patients who have had their dose titrated up to 40 mg may have their dose titrated down to 20 mg, at the discretion of the investigator. Eligible subjects randomised to 1 of 2 treatment groups, the Agent or pravastatin, for 52 weeks. 70475 Primary measure: Mean change from baseline in maximal mean intimal thickness, as assessed by IVUS (read centrally). Secondary measures: Percent change from baseline in LDL-C at 6 and 12 months. 5 Percent change from baseline in total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), LDL-C/HDL-C, TC/HDL-C, non-HDL-C/HDL-C, and triglycerides (TG). 10 Percent change from baseline in ApoB, ApoB/ApoA-1, ApoA-1, Lp (a), and particle subfractions at 6 and 12 months. Percentage of subjects on each of the possible titrated doses at 12 months. Endocardial rejection will be considered an adverse event. 15 Percent change from baseline in inflammatory markers (HLA antigen level and ICAM/VCAM expression). Safety evaluation as determined by adverse events, physical examination, and laboratory data. TRIAL DESIGN 20 This is a multicenter, randomized, double-blind, parallel-group clinical trial. Within 1 to 4 weeks post surgery, subjects are randomized to receive either the Agent or pravastatin for 52 weeks. Subjects start treatment at a dose of 10 mg of either the Agent or pravastatin at Visit 2 and the dose is titrated to 20 mg at Visit 3 during the forced titration period. At Visit 4 and subsequent visits, the investigator has the option to increase each drug up to 40 mg during 25 the optional titration period. Patients who have had their dose titrated up to 40 mg may have their dose titrated back down to 20 mg at the investigator"s discretion. 70475 TRIAL DESIGN Pre-transplant Forced Titration Optional Titration Visit 1 2 3 4 5 6 7 Week (W)/ WO W2 W4 M2 M3 M4 Month (M) 8 9 10 11 M5 M6 M9 M12 Agent (mg) 10 20 >20* PRAVASTATIN (mg) 10 20 >20* Randomisation** * Subjects who are tolerating 20 mg of the Agent or Pravastatin at Visit 4 may have their dose titrated up to 40 mg, at the discretion of the investigator. ** Subjects should be randomized within 4 weeks of cardiac transplantation and must not have received any other lipid lowering therapy post-surgery. Inclusion criteria 5 (1) have undergone cardiac transplantation up to four weeks prior to randomization (2) fasting TG concentrations of Exclusion criteria 10 Any of the following is regarded as a criterion for exclusion from the trial: (1) Use of other cholesterol lowering drugs or lipid lowering dietary supplements or food additives post-transplantation prior to entering the study (2) history of serious or hypersensitivity reactions to other HMG-CoA reductase inhibitors 15 (3) pregnant women, women who are breast feeding, and women of child bearing potential who are not using chemical or mechanical contraception or have positive serum pregnancy test (a serum P-Human chorionic gonadotropin [p-HCG] analysis) 70475 (4) Subjects with a history of diabetic ketoacidosis within the past 5 years are excluded. (5) uncontrolled hypothyroidism defined as a thyroid stimulating hormone (TSH) >1.5 times the ULN at Visit 2 or subjects whose thyroid replacement therapy was initiated within the last three months 5 (6) use of concomitant medications as detailed below - except immune suppressants and diazepam (7) current alcohol and/or drug abuse (8) active liver disease or hepatic dysfunction as defined by elevations of > 1.5 times the ULN at Visit 2 in any of the following liver function tests: ALT, AST, or bilirubin 10 (9) serum CK> 3 times ULN at Visit 2 (10) serum creatinine > 220 umol/L (2.5 mg/dl) (11) subjects with cancer or with a history of cancer who, in the opinion of the investigator, have more than a minimal chance of recurrence (12) participation in another investigational drug trial less than 4 weeks before 15 randomization into the trial (13) subjects randomized to double-blind treatment who subsequently withdrew cannot re-enter this trial (14) serious or unstable medical or psychological conditions that, in the opinion of the investigator, would compromise the subject"s safety or successful participation in the 20 trial (15) subjects taking cyclic hormone replacement therapy (HRT), cyclic oral contraceptive therapy (OCT), a depot progesterone injection, or subjects whose non-cyclic HRT or OCT was initiated within the last 3 months 25 70475 DISALLOWED MEDICATIONS CLASS OF DRUG Antibiotics/ antifungals Anti-epileptics/ antidepressants Acne treatment GENERIC NAME Erythromycin Base Erythromycin Ethyl Succinate, Acetyl Sulfisoxazole Rifampicin Fluconazole Ketaconazole Itraconzole Phenytoin Phenobarbitol Fluoxetine Carbemazepine Isotretinoin Antiulcer drugs Cimetidine Cisapride 70475 CLASS OF DRUG GENERIC NAME Systemic Steroids Triamcinolone Acetonide Triamcinolone Diacetate Betamethasone Sodium Phosphate Betamethasone Acetate Hydrocortisone Hydrocortisone Acetate Hydrocortisone Sodium Phosphate Hydrocortisone Sodium Succinate Cortisone Acetate Dexamethasone Dexamethasone Acetate Dexamethasone Sodium Prednisone Methylprednisolone Methylprenisolone Acetate Methylprednisolone Sodium Succinate Prednisolone Tebutate Prednisolone Sodium Phosphate Methyltestosterone Fluoxymesterone Antihistamine Astemizole Terfenadine 70475 CLASS OF DRUG GENERIC NAME Lipid Regulation Niacin/Nicotinic Acid Probucol Psyllium Preparations Clofibrate Cholestyramine Colestipol Hydrochloride Gemfibrozil Atorvastatin Lovastatin Pravastatin (except study medication) Simvastatin Fluvastatin Cerevestatin Fish oils (any dose) lipid lowering dietary supplements lipid lowering food additives Hormone Therapy Estrogen and progesterone combinations which are bi or tri phasic. Friedewald Equation The LDL-C level is calculated from the Friedewald equation as follows: 5 For SI units (mmol/1) LDL-C = Total cholesterol - [HDL-C + Triglycerides/2.2) For non-SI units (mg/dl): LDL-C = Total cholesterol - [HDL-C + triglycerides/5] 70475 Summary of NCEP Goals for Lipid Management"1 NCEP Risk Category Target LDL-C (NCEP) No CHD/PVD and I or no risk factors No CHD/PVD and 2 or more risk factors Clinically evident CHD/P VD 5 a Second Report of the Expert Panel on Detection, Evaluation, and Treatment of High Blood Cholesterol in Adults. Bethesda (MD): National Institutes of Health, National Heart and Lung Institute 1993 Sep Report No.: 93-3095. NCEP National Cholesterol Education Program. 10 FOR TREATING HYPERLIPIDAEMIA, AND ASSOCIATED CONDITIONS, USING A COMBINATION OF THE AGENT AND A FIBRATE DRUG Myopathy and rhabdomyolysis have been associated with taking a statin in combination with 15 gemfibrozil, niacin, cyclosporin or erythromycin, (HMG CoA reductase inhibitors, Hunninghake, Current Opinion in Lipidology (1992) 3, 22-28) which are all substrates for P450 3A4. Additionally, adverse events associated with taking a fibrate drug have also been reported to increase with concomitant statin therapy, such as a myosistis-flu like syndrome, which occasionally occurs in patients receiving gemfibrozil, increases to 5% of patients when 20 a statin is also administered. Combination of a statin with a fibrate drug is contraindicated on the labels, both in the USA and Europe, of all commercially available statins. Despite the possibility of the occurrence of serious drug interactions doctors do prescribe combination therapy of a statin and a fibrate 25 drug to patients with more severe levels of hypercholesterolaemia, such as in patients with 70475 familial combined hyperlipidaemia, where the risk of a serious drug interaction is outweighed by the benefits of the combination therapy. It is recommended that where combination therapy of a fibrate drug and a statin is prescribed that patients should have their CK value determined on a regular basis, typically every 6-weeks, until a stable pattern is established. Therapy is stopped if muscle symptoms occur in association with elevated CK activity. However, as quoted from the US label of Lipitor™ "there is no assurance that such monitoring [of CK levels] will" prevent the occurrence of severe myopathy" We have discovered that the Agent is extremely effective at treating mixed hyperlipidaemia and hypertriglyceridaemia in patients when combined with a fibrate drug and that the Agent is not metabolised by cytochrome P450 isoenzyme 3 A4. Therefore we have found through the use of the Agent in a clinical study that the Agent may be conveniently dosed to patients who are also taking a fibrate drug without any clinically significant side effects associated with the concomitant dosing of the Agent and the fibrate drug. In addition much higher levels of lipid 5 lowering than has previously been achieved can be achieved by the use of the Agent and a fibrate drug. The combination is of most use in mixed hyperlipidemia where the LDL and VLDL and TGs are all elevated. We present as the first feature of the invention a method of providing safe non-interacting lipid lowering combination therapy to a mammal, including a human patient, preferably a patient suffering mixed hyperlipidaemia and hypertriglyceridaemia, which method comprises administering to the patient the Agent and a fibrate drug. By the term "combination" as used herein we mean either (1) that the Agent and the fibrate drug of the combination are administered together in the same pharmaceutical formulation or (2) that the Agent and the drug are administered separately. When administered separately components of the combination may be administered to the patient simultaneously or sequentially. By the term "fibrate drug" we mean the class of drugs which are based around the structure/activity of fibric acid and such drugs include the following commercially available 70475 versions; bezafibrate, clofibrate, ciprofibrate, fenofibrate and gemfibrizol, preferably fenofibrate. Preferred patients in which the combination of the invention is to be administered are those who have already been found to suffer from myopathy or rhabdomylosis when treated with a statin and/or with a fibrate drug which is metabolised by P450 3 A4. Particular patients who may benefit from the method of the invention are those who: 1) suffer combined (type IIb) hypercholesterolaemia (typically LDL-C> 135 mg/dL and TG>200 mg/dL); 2) suffer familial (type IV and V) hypercholesterolaemia; 3) patients suffering secondary hypercholesterolaemia from such conditions as: a) diabetes (type I or II), b) nephrotic syndrome, c) uremia, d) hyperthyroidism, and e) obstructive liver disease. 4) patients with established CHD or other atherosclerotic disease, such a PVD, stroke or peripheral arterial occlusive disease; 5) patients who are at high risk of developing CHD or other atherosclerotic disease, such as described above, because of a combination of risk factors. The term "high risk" is defined in the "Recommendations of Second Joint Task Force of European and other Societies on Coronary Prevention", (Wood, D. et. al. European Heart Journal, Atherosclerosis and Journal of Hypertension 1998) as absolute CHD risk of > 20% over 10 years or will exceed 20% if projected to age 60 years. Whether a patient is at high risk or not may be determined by the charts which accompany the above recommendations and which charts are incorporated herein by reference. For example a male patient in his 40s who smokes and has a systolic blood pressure of 180 mm Hg or higher and a total plasma cholesterol concentration of 7 mmol/L or higher will be classified as high risk. Similarly other guidelines for reducing risk factors may be applied such as those described in; 70475 a) JAMA, June 16, 1993-Vol 629, No.23, Pages 3015-3023 - "Summary of the NCEP Adult Treatment Panel II Report" - specifically Figure 1. Page 3018-3019, which is incorporated herein by reference. b) Post Graduate Medical Journal 1993; 69(811): 359-369 - "Management of hyperlipidaemia: guidelines of the British Hyperlipidaemic Association"- specifically Table V and Table VI, which are incorporated herein by reference. c) Heart 1998; 80 Supplement 2:S1-S29 - "Joint British recommendations on prevention of coronary heart disease in clinical practice" - specifically Figure 1 on pages S4-S5, which is incorporated herein by reference. d) The Lancet 1995; December 2, Vol.346, 1467-1471 - "Sheffield risk and treatment table for cholesterol lowering for primary prevention of coronary heart disease" -specifically the Table appearing at page 1468, which is incorporated herein by reference. The statin therapy may be administered so as to achieve in the patient receiving a fibrate drug: 1) a reduction of LDL-C of at least 30, 40, 50, 60, 70 or 80%. 2) a maintenance or increase of HDL-C of at least 5, 10, 15%. 3) a reduction in triglycerides of at least 10, 20, 30 or 40%. The combination of the fibrate and the Agent may be applied as separate dosage forms, which may be taken simultaneously or sequentially, or in a combined dosage form. Doses of the Agent which are administered are at the discretion of the attendant physician generally taking into account the severity of the disease, the age, weight and sex of the patient. However typical doses will be from 5 to 80 mg per day orally, preferably as a once a day oral tablet form. Doses of the fibrate drug which are administered in the combination of the invention also are at the discretion of the attendant physician taking into account all of the above factors plus in particular which fibrate drug is used. 70475 For clofibrate (such as Atromid-S®) 20-30 mg/kg body weight daily in 2 or 3 divided oral doses after meals is typical. For bezofibrate (such as Bezalip®) 400 mg once a day orally, after food at night or in the morning, is typical. For fenofibrate (such as Lipantil®) 200 mg once a day, or 62 mg three times a day, with food is typical. For gemfibrozil (such as Lopid®) 600 mg twice a day orally is typical. For cipofibrate (such as Modalim®) 100 mg once a day orally is typical. A preferred fibrate drug is fenofibrate. The particular aspect of this invention is illustrated by the following non-limiting examples: Clinical Trial A Randomised, Non-controlled, Single-centre, Open-label, 3-way Crossover Trial to Assess the Effect of Co-administration of the Agent and Fenofibrate on the Pharmacokinetics of Each Compound in Healthy Male Volunteers Objectives: The primary objective of this trial is to assess the effect of co- administration of the Agent and fenofibrate on the pharmacokinetics of both the Agent and fenofibrate The safety of all volunteers will be ensured by clinical monitoring Type and number of 14 healthy male volunteers volunteers; Trial design: The trial will be a randomised, non-controlled, 3-way crossover study carried out at a single centre Trial treatment: This trial will consist of three 7-day treatment periods (Periods A, B, and C). Volunteers will receive, in random order, a 10 mg capsule of 70475 Duration of treatment: Primary endpoints: Secondary endpoints: the Agent once daily for 7 days, a 67 mg fenofibrate capsule 3 times daily for 7 days and the combination for 7 days. There will be a minimum of a 3-week washout between each trial period. The study will consist of 3 periods of 7-day dosing (a total of 21 dosing days) with a 3-week washout between dosing in Periods A, B and C. The primary endpoints are: • AUC(0-24) and Cmax of the Agent in the presence and absence of fenofibrate • AUC(0-8) and Cinax of fenofibrate in the presence and absence of the Agent the secondary endpoints are: • tmax t1/2, Cmin for the Agent in the presence and absence of fenofibrate • tmax t1/2, Cmin for fenofibrate in the presence and absence of the Agent • safety assessments: symptoms, blood pressure and pulse rate, ECG, clinical chemistry, haematology and urinalysis 70475 TRIAL PLAN Summary of procedures - overall plan for Trial Periods A, B and C Trial Days Medical Doses of the Agent / fenofibrate or combination P & BP 12 lead ECG Safety Blood & Urine Kinetics of the Agent Kinetics Fenofibrate Pre-trial + + + +a -1 +b 1 + +c +c 2 + +b +d +e 3 + +d +e 4 + +b 5 + 6 + +b +« +c 7 + + + +d +c 8 j^b +d 9 +d 10 +b +d Post-trial + + + +a +d "Full clinical chemistry, haematology and urine labstix. bClinical chemistry only: urea, creatinine, total protein, albumin, uric acid, total bilirubin (and unconjugated and 5 conjugated bilirubin if total bilirubin raised), alkaline phosphatase, alanine aminotransferase (ALT), aspartate aminotranseferase (AST), gamma glutamyltransferase, creatine kinase (CK), sodium, potassium, calcium, cholesterol and triglycerides. c Pre-dose all trial periods. dOnly trial periods when volunteers receive the Agent 10 eonly trial periods when volunteers receive fenofibrate P = pulse; BP = blood pressure 70475 TRIAL PLAN II Trial Day 7 in Periods A, B and C Time P & BP (L) 12 lead ECG Safety blood & urinee Kinetics of the Agentb Kinetics fenofibratec Meals & Fluids Pre-dose + + + + B Dose (0 h) D 0.5 h + + l h + + 2 h + + D 3 h + + + + 4 h + + M,F 5 h + + + + 6 h + + 8 h + + S 10 h + M 12 h + + + F 14 h S 18 h + W 24 h + + +a + 30 h + 48 h + 54 h + 72 h +a + "clinical chemistry only: urea, creatinine, total protein, albumin, uric acid, total bilirubin (and unconjugated and conjugated bilirubin if total bilirubin raised), alkaline phosphatase, ALT, AST, gamma glutamyltransferase, CK, sodium, potassium, calcium, cholesterol and triglycerides. bOnly trial periods when volunteers receive the Agent cOnly trial periods when volunteers receive fenofibrate L = lying; P = pulse; BP = blood pressure; D = drink; S = snack; M = meal; F = free access to permitted fluid and food; W = free access to water only 1 OBJECTIVES Primary objective The primary objective of this trial is to assess the effect of co-administration of the Agent and fenofibrate on the pharmacokinetics of both the Agent and fenofibrate. 70475 Secondary objective There is no secondary objective for this trial. The safety of all volunteers will be ensured by clinical monitoring. Design 5 The trial will be a randomised, non-controlled, open-label, 3-way crossover study carried out at a single centre. Volunteers will receive 3 treatment regimens in random order: • 10 mg of the Agent once daily for 7 days • fenofibrate (Lipantil™) 67 mg x 3 daily for 7 days 10 • the Agent (10 mg once daily) and fenofibrate (Lipantil™, 67 mg x 3 daily) given in combination for 7 days There will be a minimum of 3 weeks (21 days) washout between each treatment period. Inclusion criteria For inclusion in the trial, volunteers must meet all of the following criteria: 15 • male, aged between 18 and 65 years inclusive • normal clinical examination, including medical history, resting electrocardiogram (ECG) and 24-hour continuous ambulatory ECG (if not performed in the past 12 months) • negative screens for serum hepatitis B surface antigen and hepatitis C antibody and a 20 normal screen for ferritin within the previous 12 months • weight not differing by more than 20% from the desirable weight (Metropolitan Height and Weight Tables) Exclusion criteria 25 Volunteers must be excluded from the trial if any of the following criteria are met: 70475 • use of any medication or therapy, including drugs of abuse • receipt of another new chemical entity in the 4 months before dosing in this trial (a new chemical entity is defined as a compound which has not been submitted for marketing authorisation) 5 • participation in another trial within 3 months before the start of the present trial, apart from non-invasive methodology trials in which no drugs were given • any acute illness within 2 weeks before the start of the trial • any clinically significant abnormalities in clinical chemistry, haematology or urinalysis results. In addition the following clinical chemistry parameters should be 10 no greater than the upper limit of normal: total bilirubin, ALT, AST and CK • risk (in the investigator"s opinion) of transmitting, through blood or other body fluids, the agents responsible for acquired immune deficiency syndrome (AIDS), hepatitis B or hepatitis C • definite or suspected personal history or family history of adverse drug reactions, or 15 hypersensitivity to drugs with a similar chemical structure to the Agent or related statins, or fenofibrate and related fibrate drugs • history or presence of gastrointestinal, hepatic, biliary or renal disease or other condition known to interfere with absorption, distribution, metabolism or excretion of drugs 20 • history of Gilbert"s syndrome • if participation in the trial would result in the volunteer donating more than 1350 ml of blood in the 12 months before the end of the trial • excessive intake of alcohol, defined as a maximum weekly intake of greater than 28 units (1 unit equals half a pint of beer or a measure of spirits) 25 • treatment in the previous 3 months with any drug known to have a well-defined potential for hepatotoxicity (eg, halothane) 70475 • clinical judgement by the investigator or the volunteer"s general practitioner that the volunteer should not participate in the trial Volunteer restrictions Volunteers will be required to: 5 • abstain from taking any medication (including over-the-counter remedies) from 96 hours before Trial Day 1 to 72 hours after receiving the last dose of the Agent or morning dose of fenofibrate in each trial period unless the investigator has given prior consent • fast from midnight on the night before each trial day and eat a light breakfast on 10 arrival on Trial Day 1 to 7 in each trial period • refrain from driving, cycling, using machinery (drills, Sanders, sharp instruments etc.) for 24 hours after receiving first dose on Trial Day 7 in each period • remain for 24 hours after receiving first dose on Trial Day 7 in each trial period • abstain from smoking, consuming grapefruit, grapefruit juice, liquorice or caffeine- 15 containing drinks or foods (eg, coffee, tea, cocoa, chocolate and cola) from midnight before Trial Day 1 until 72 hours after receiving the last dose of the Agent or morning dose of fenofibrate in each trial period • abstain from drinking alcohol from 96 hours before Trial Day 1 until 72 hours after receiving the last dose of the Agent or morning dose fenofibrate in each trial period 20 • refrain from physical exercise from 96 hours before Trial Day 1 until 72 hours after receiving the last of the Agent or morning dose of fenofibrate in each trial period • refrain from potentially hazardous work or activities, from receiving the first dose of the Agent or fenofibrate until the post-trial medical • abstain from donating blood during the trial and for 3 months following their last 25 dose of trial treatment 70475 Formulation, presentation and storage Dosage and administration Capsules of the Agent or fenofibrate will be taken orally with 200 ml of purified water with the volunteer sitting in an upright position. On Trial Days 1 to 7 of each treatment period, volunteers will receive one of the following treatments: • 1x10 mg capsule of the Agent to be taken between 08:30 and 09:30 hours • 3 x 67 mg fenofibrate capsules - the 1st capsule to be taken between 08:30 and 09:30 hours - the 2nd capsule to be taken between 16:30 and 17:30 hours with food - the 3rd capsule to be taken between 22:30 and 23:30 hours with food- • 1x10 mg capsule of the Agnet and 3 x 67 mg fenofibrate capsules: - 1 capsule of the Agent and the 1st fenofibrate capsule to be taken simultaneously between 08:30 and 09:30 hours - the 2nd fenofibrate capsule to be taken between 16:30 and 17:30 hours with food - the 3rd fenofibrate capsule to be taken between 22:30 and 23:30 hours with food On Trial Days 1 to 6 of each trial period, volunteers will visit the unit daily and will be allowed to leave the unit immediately after administration of doses of the Agent, fenofibrate or the the Agent / fenofibrate combination, except on Trial Day 7 when volunteers will remain resident for 24 hours. In trial periods when the volunteers are randomised to fenofibrate, they will take the further 2 doses of fenofibrate at home. The volunteers will be provided with 1 pot of fenofibrate to be taken as outlined above. Volunteers will be issued with a pre-set timer to ensure that the dose is taken at the correct time, and a diary card to document the dose was taken. 70475 When the the Agent and fenofibrate are given to the volunteers, the tear-off labels will be attached to the appropriate case report form (CRF). The investigator must ensure that each volunteer receives the correct treatment. Clinical and laboratory assessments 5 Primary endpoints The following parameters will be measured as primary endpoints: • AUC(0-24) and Cmax of the Agent in the presence and absence of fenofibrate • AUC(0-8) and Cmax of fenofibrate in the presence and absence of the Agent Secondary endpoints 10 The following parameters will be measured as secondary endpoints: • tmax t1/2, Cmin for the Agent in the presence and absence of fenofibrate • tmax, t1/2 and Cmjn for fenofibrate in the presence and absence of the Agent safety assessments: symptoms, blood pressure and pulse rate, ECG, clinical chemistry, haematology and urinalysis. 15 Pharmaceutical compositions The following Example illustrates, but is not intended to limit, pharmaceutical dosage forms which are suitable for use in the invention as defined herein: 20 Capsule mg The Agent 5.0 Lactose 42.5 Cornstarch 20.0 25 Microcrystalline cellulose 32.0 Pregelatinised starch 3.3 Hydrotalcite 1.1 magnesium stearate 1.1 70475 Capsules containing 1, 2.5 or l0mg of the Agent may be obtained similarly using more or less lactose as appropriate, to maintain a total fill weight of 105mg. ABBREVIATIONS AND CONVENTIONS USED Abbreviation Term ALT ALP apo B AST AUC AUC(O-t) CABG Cmax CK CVA ECG EAS EDTA XGT HMG-CoA HDL alanine aminotransferase alkaline phosphatase apolipoprotein B 100 aspartate aminotransferase area under the concentration curve from zero to infinity area under the curve of plasma concentration against time from zero to time of last quantifiable concentration Coronary artery bypass graft maximum concentration creatinine kinase cerebrovascular accident electrocardiogram European Atherosclerosis Society ethylenediamine-tetraacetic acid Gemma glutaryl transferase 3-hydroxy-3-methylglutaryl coenzyme A high-density lipoprotein 70475 Abbreviation Term HPLC high-performance liquid chromatography HRT hormone replacement therapy IU International Units IVUS Intravascular ultrasenography LDL low density lipoprotein LDL-C low density lipoprotein cholesterol MVA mevalonic acid NC not calculable NCEP national cholesterol eduction program NDSR national data system for research THC tetrahydrocannabinol TG triglyceride t1/2 terminal elimination half-life tmax time of maximum concentration TC total cholesterol TG triglycerides TIA transient ischemic attack TSH thyroid stimulating hormone ULN upper limit of normal VLDL very low-density lipoprotein WE CLAIM: 3. A non-interacting drug combination comprising a first drug, HMG-CoA reductase inhibitor, which is (E)-7-[4-(4-fluorophenyl)-6-isopropyl-2-methyl(methylsulfonyl)amino]pyrimidin-5-yl] (3R,5S)-3,5-dihydroxyhept-6-enoic acid or a pharmaceutically acceptable salt thereof and a second drug which is an inhibitor, inducer of substrate of P450 isoenzyme 3A4 of the kind such as herein described, with ratio percentages of first drug: second drug from between 0.25:99.75% w/w and 99.5:0.5% w/w. 2. A non-interacting drug combination as claimed in claim 1, wherein the said second drug is an inhibitor or inducer of P450 isoenzyme 3A4. 3. A non-interacting drug combination as claimed in either claim 1 or claim 2, wherein each drug is administered together or each drug is administered sequentially. 4. A non-interacting drug combination as claimed in any claim from 1 to 3, wherein the said second drug is used to lower cholesterol and is an inducer, inhibitor or substrate of P450 isoenzyme 3A4. 5. A non-interacting drug combination as claimed in claim 4, wherein the said second drug is selected from bezafibrate, clofibrate, fenofibrate, gemfibrozol and niacin. 6. A non-interacting drug combination, as claimed in claim 5, wherein the said second drug is fenofibrate. 7. A non-interacting drug combination, as claimed in any claim from 1 to 3, wherein the said second drug is used in treating cardiovascular conditions and is also an inhibitor, inducer or substrate of P450 isoenzyme 3A4. 8. A non-interacting drug combination as claimed in claim 7, wherein the said second drug is selected from digitoxin, diltiazem, losartan, nifedipine, quinidine, verapamil and warfarin. 9. A non-interacting drug combination as claimed in any claim from 1 to 3, wherein the said second drug is used in immunosuppresion therapy and is an inducer, inhibitor or substrate of P450 isoenzyme 3A4. 10. A non-interacting drug combination as claimed in claim 9, wherein the second drug is selected from cyclosporine, tacrolimus and a corticosteroid. 11. A non-interacting drug combination, as claimed in any claim from 1 to 10, wherein (E)-7-[4-(4-fluorophenyl)-6~isopropyl-2-[methyl(methylsulfonyl)ammo]pyrimidin-5-yl] (3R,5S)-3,5-dihydroxyhept-6-enoic acid or a pharmaceutically acceptable salt thereof is dosed at 5, 10, 20, 40 or 80mg once per day. 12. A pharmaceutical formulation comprising a non-interacting drug combination as claimed in any of the preceding claims, wherein it comprises (E)-7-[4-(4-fluorophenyl)-6-isopropyl-2-[methyl (methylsulfonyl) amino] pyrirnidin-5-yl] (3R,5S)-3,5-dihydroxyhept-6-enoic acid or a pharmaceutically acceptable salt thereof, a drug which is an inducer, inhibitor or substrate of P450 isoenzyme 3A4 and a pharmaceuticaUy-acceptable diluent, carrier or adjuvant of the kind such as herein described. 13. A pharmaceutical formulation, as claimed in claim 12, wherein the said second drug is a substrate of P450 isoenzyme 3A4 and is selected from acetaminophen, aldrin, aflentanil, amiodorane, astemizole, benzphetamine, budenoside, carbamazepine, cyclophosphamide, cyclosporin, dapsone, digitoxin, ditiazem, diazepam, erthrornycin, etoposide, flutamide, hydroxyarginine, ifosphamide, imipramine, lansoprazole, lidocaine, lovatidine, losartan, lovastatin, midrazolam, nifedipine, omeprazole, quinidine, rapamycin, retenoic acid, steroids, tacrolimus, teniposide, theophyline, toremifene, triazolam, troleandomycin, verapamil, warfarin, zatosetron and zonisamide. 14. A pharmaceutical formulation as claimed in claim 12, wherein the said second drug is an inhibitor of P450 isoenzyme 3A4 and is selected from clotrimazole, ethinylestradiol, gestodene, itraconazole, ketoconazole, miconazole, diltiazem, naringenin, erthrornycin, cyclosporine and triacetyloleandomycin. 15. A pharmaceutical formulation as claimed in claim 12, wherein the said second drug is an inducer of P450 isoenzyme 3A4 is selected arbamazepine, dexamethasone, phenobarbital, phenytoin, rifampin, sulfadimidine, sulfinipyrazone and triacetyloleandomycin. 16. A pharmacy pack whenever comprises the non-interacting drug combination as claimed in any of the preceding claim, comprising the first drug which is (E)-7-[4-(4-fluorophenyl)-6-isopropyl-2-[methyl(methylsulfonyl)amino]pyrimidin-5-yl] (3R,5S)-3,5-dihydroxyhept-6-enoic acid or a pharmaceutically acceptable salt thereof and the second drug which is an inducer, inhibitor or substrate of P450 isoenzyme 4A4. Dated this February 04, 2000. (DR. ANUSHRI GUPTA) OF REMFRY AND SAGAR ATTORNEY FOR THE APPLICANTS

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113-MUM-2000-CORRESPONDENCE(06-10-2010).pdf

113-MUM-2000-CORRESPONDENCE(10-11-2010).pdf

113-mum-2000-correspondence(12-10-2007).pdf

113-MUM-2000-CORRESPONDENCE(14-10-2010).pdf

113-MUM-2000-CORRESPONDENCE(14-12-2010).pdf

113-mum-2000-correspondence(18-5-2010).pdf

113-MUM-2000-CORRESPONDENCE(23-8-2010).pdf

113-MUM-2000-CORRESPONDENCE(24-8-2010).pdf

113-mum-2000-correspondence(26-7-2007).pdf

113-MUM-2000-CORRESPONDENCE(5-10-2010).pdf

113-MUM-2000-CORRESPONDENCE(6-10-2010).pdf

113-mum-2000-correspondence(ipo)-(05-09-2007).pdf

113-mum-2000-correspondence(ipo)-(21-1-2008).pdf

113-mum-2000-correspondence(ipo)-(31-8-2010).pdf

113-mum-2000-description(complete)-(4-2-2000).pdf

113-mum-2000-description(granted)-(30-11-2007).pdf

113-mum-2000-drawing(28-09-2007).pdf

113-mum-2000-drawing(granted)-(30-11-2007).pdf

113-mum-2000-form 1(06-07-2007).pdf

113-mum-2000-form 13(24-8-2010).pdf

113-mum-2000-form 13(26-07-2007).pdf

113-mum-2000-form 13(26-7-2007).pdf

113-mum-2000-form 13(28-09-2007).pdf

113-mum-2000-form 13(28-9-2007).pdf

113-mum-2000-form 18(15-12-2005).pdf

113-mum-2000-form 2(complete)-(4-2-2000).pdf

113-mum-2000-form 2(granted)-(28-09-2007).doc

113-mum-2000-form 2(granted)-(28-09-2007).pdf

113-mum-2000-form 2(granted)-(30-11-2007).pdf

113-mum-2000-form 2(title page)-(complete)-(4-2-2000).pdf

113-mum-2000-form 2(title page)-(granted)-(30-11-2007).pdf

113-mum-2000-form 3(04-02-2000).pdf

113-mum-2000-form 3(06-07-2007).pdf

113-mum-2000-form 5(04-02-2000).pdf

113-mum-2000-marked copy(6-7-2007).pdf

113-MUM-2000-OTHER DOCUMENT(10-11-2010).pdf

113-MUM-2000-OTHER DOCUMENT(14-12-2010).pdf

113-mum-2000-petition under rule 137(06-07-2007).pdf

113-mum-2000-petition under rule 138(05-07-2007).pdf

113-mum-2000-petition under rule 138(26-3-2009).pdf

113-mum-2000-petition under rule 138(27-5-2009).pdf

113-mum-2000-petition under rule 138(28-09-2007).pdf

113-mum-2000-post-grant oppostion(27-1-2009).pdf

113-MUM-2000-POWER OF ATTORNEY(14-10-2010).pdf

113-MUM-2000-POWER OF ATTORNEY(23-8-2010).pdf

113-mum-2000-power of authority(05-05-2000).pdf

113-mum-2000-power of authority(06-07-2007).pdf

113-mum-2000-power of authority(28-09-2007).pdf

113-mum-2000-reply statement statement of pre-grant oppostion(26-4-2009).pdf

113-mum-2000-reply statement statement of pre-grant oppostion(29-6-2009).pdf

113-mum-2000-specification(amended)-(6-7-2007).pdf

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