REFERENCES
- Pearson , D. C. , May , G. R. , Fick , G. and Sutherland , L. R. 2000 . Azathioprine for maintaining remission of Crohn's disease . Cochrane Database Syst. Rev. , : CD000067
- Timmer , A. , McDonald , J. W. and MacDonald , J. K. 2007 . Azathioprine and 6-mercaptopurine for maintenance of remission in ulcerative colitis . Cochrane Database Syst Rev. , : CD000478
- Derijks , L. J.J. , Gilissen , L. P.L. , Engels , L. G.J.B. , Bos , L. P. , Bus , P. J. , Lohman , J. J.H.M. , van Deventer , S. J.H. , Hommes , D. W. and Hooymans , P. M. 2006 . Pharmacokinetics of 6-thioguanine in patients with inflammatory bowel disease . Ther. Drug Monit. , 28 : 45 – 50 .
- Yates , C. R. , Krynetski , E. Y. , Loennechen , T. , Fessing , M. Y. , Tai , H. L. , Pui , C. H. , Relling , M. V. and Evans , W. E. 1997 . Molecular diagnosis of thiopurine S-methyltransferase deficiency: genetic basis for azathioprine and mercaptopurine intolerance . Ann. Intern. Med. , 126 : 608 – 614 .
- Peters , G. J. and Veerkamp , J. H. 1979 . Concentration, synthesis and utilization of phosphoribosylpyrophosphate in lymphocytes of five mammalian species . Int. J. Biochem. , 10 : 885 – 888 .
- Tax , W. J. , Veerkamp , J. H. and Trijbels , J. M. 1976 . Activity of purine phosphoribosyltransferases and of two enzymes of pyrimidine biosynthesis in erythrocytes of ten mammalian species . Comp. Biochem. Physiol. B , 54 : 209 – 212 .
- Keizer-Garritsen , J. J. , Brouwer , C. , Lambooy , L. H. , Ter , R. P. , Bokkerink , J. P. , Trijbels , F. J. and De Abreu , R. A. 2003 . Measurement of thiopurine S-methyltransferase activity in human blood samples based on high-performance liquid chromatography: reference values in erythrocytes from children . Ann. Clin. Biochem. , 40 : 86 – 93 .
- Dilger , K. , Schaeffeler , E. , Lukas , M. , Strauch , U. , Herfarth , H. , Muller , R. and Schwab , M. 2007 . Monitoring of thiopurine methyltransferase activity in postsurgical patients with Crohn's disease during 1 year of treatment with azathioprine or mesalazine . Ther. Drug Monit. , 29 : 1 – 5 .
- Daperno , M. , Sostegni , R. , Canaparo , R. , Serpe , L. , Lavagna , A. , Crocella , L. , Castagno , F. , Vernetto , A. , Rigazio , C. , Ercole , E. , D’Antico , S. , Pera , A. , Zara , G. and Rocca , R. 2009 . Prospective study of the effects of concomitant medications on thiopurine metabolism in inflammatory bowel disease . Aliment. Pharmacol. Ther. , doi:10.1111/j.1365-2036.2009.04106.x-
- Schaeffeler , E. , Fischer , C. , Brockmeier , D. , Wernet , D. , Moerike , K. , Eichelbaum , M. , Zanger , U. M. and Schwab , M. 2004 . Comprehensive analysis of thiopurine S-methyltransferase phenotype-genotype correlation in a large population of German-Caucasians and identification of novel TPMT variants . Pharmacogenetics , 14 : 407 – 417 .
- Lennard , L. , Van Loon , J. A. , Lilleyman , J. S. and Weinshilboum , R. M. 1987 . Thiopurine pharmacogenetics in leukemia: correlation of erythrocyte thiopurine methyltransferase activity and 6-thioguanine nucleotide concentrations . Clin. Pharmacol. Ther. , 41 : 18 – 25 .
- Raivio , K. O. and Hovi , T. 1978 . Purine reutilization in phytohemagglutinin-stimulated human T-lymphocytes . Exp. Cell Res. , 116 : 75 – 83 .
- Peters , G. J. and Veerkamp , J. H. 1983 . Purine and pyrimidine metabolism in peripheral blood lymphocytes . Int. J. Biochem. , 15 : 115 – 123 .
- Spigelman , A. D. , Farmer , K. C. , Oliver , S. , Nugent , K. P. , Bennett , P. N. , Notarianni , L. J. , Dobrocky , P. and Phillips , R. K. 1995 . Caffeine phenotyping of cytochrome P4501A2, N-acetyltransferase, and xanthine oxidase in patients with familial adenomatous polyposis . Gut , 36 : 251 – 254 .
- Jetter , A. , Kinzig , M. , Rodamer , M. , Tomalik-Scharte , D. , Sorgel , F. and Fuhr , U. 2009 . Phenotyping of N-acetyltransferase type 2 and xanthine oxidase with caffeine: when should urine samples be collected? . Eur. J. Clin. Pharmacol. , 65 : 411 – 417 .