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[Cancer Research 54, 3723-3725, July 15, 1994]
© 1994 American Association for Cancer Research

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Metabolic Fate of Irinotecan in Humans: Correlation of Glucuronidation with Diarrhea1

Elora Gupta, Timothy M. Lestingi, Rosemarie Mick, Jacqueline Ramirez, Everett E. Vokes and Mark J. Ratain2

Section of Hematology/Oncology, Department of Medicine [E. G., T. M. L., R. M., J. R., E. E. V., M. J. R.], Committee on Clinical Pharmacology [R. M., M. J. R.], Cancer Research Center [R. M., E. E. V., M. J. R.]. and Department of Radiation and Cellular Oncology [E. E. V.], University of Chicago Pritzker School of Medicine, Chicago, Illinois 60637

Irinotecan (7-ethyl-10-[4-(1-piperidino)-1-piperidino]carbonyloxy-camptothecin (CPT-11) is hydrolyzed by the enzyme carboxyl esterase to 7-ethyl-10-hydroxycamptothecin (SN-38), which further undergoes glucuronic acid conjugation to form the corresponding SN-38 glucuronide (SN-38G). SN-38 is believed to be the cause of treatment-related diarrhea, a dose-limiting toxicity of CPT-11 observed in phase I clinical trials. This study investigated the effect of glucuronidation on the concentrations of SN-38 following CPT-11 infusion in 21 patients undergoing a phase I trial. To assess the relationship between gastrointestinal toxicity and pharmacokinetics of CPT-11 and its metabolites, we defined a "biliary index" of SN-38 which was the product of the relative area ratio of SN-38 to SN-38G and the total CPT-11 area under the plasma concentration-time curve. Nine patients with grade 3–4 diarrhea had higher biliary indexes than 12 patients with grade 0–2 diarrhea (median 2228 versus 5499, P = 0.0004). The relatively higher index values, suggestive of higher biliary concentrations of SN-38, were possibly due to low glucuronidation rates. Hence, modulation of glucuronidation may be effective in increasing the therapeutic index of CPT-11.

1 Supported in part by Grants N01-CM-07301 and CA-14599.

2 To whom requests for reprints should be addressed, at University of Chicago, 5841 S. Maryland Ave., MC2115, Chicago, IL 60637.

Received 5/31/94. Accepted 6/15/94.


Commentary

From Bedside to Bench to Bedside to Clinical Practice: An Odyssey with Irinotecan
Mark J. Ratain
Clin. Cancer Res. 2006 12: 1658-1660. [Full Text] [PDF]



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E. K. Rowinsky, T. R. Johnson, C. E. Geyer Jr, L. A. Hammond, S. G. Eckhardt, R. Drengler, L. Smetzer, J. Coyle, J. Rizzo, G. Schwartz, et al.
DX-8951f, a Hexacyclic Camptothecin Analog, on a Daily-Times-Five Schedule: A Phase I and Pharmacokinetic Study in Patients With Advanced Solid Malignancies
J. Clin. Oncol., September 17, 2000; 18(17): 3151 - 3163.
[Abstract] [Full Text] [PDF]


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Clin. Cancer Res.Home page
F. Innocenti, W. M. Stadler, L. Iyer, J. Ramírez, E. E. Vokes, and M. J. Ratain
Flavopiridol Metabolism in Cancer Patients Is Associated with the Occurrence of Diarrhea
Clin. Cancer Res., September 1, 2000; 6(9): 3400 - 3405.
[Abstract] [Full Text]


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Clin. Cancer Res.Home page
D. F. S. Kehrer, W. Yamamoto, J. Verweij, M. J. A. de Jonge, P. de Bruijn, and A. Sparreboom
Factors Involved in Prolongation of the Terminal Disposition Phase of SN-38: Clinical and Experimental Studies
Clin. Cancer Res., September 1, 2000; 6(9): 3451 - 3458.
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Clin. Cancer Res.Home page
H. C. Pitot, R. M. Goldberg, J. M. Reid, J. A. Sloan, P. A. Skaff, C. Erlichman, J. Rubin, P. A. Burch, A. A. Adjei, S. A. Alberts, et al.
Phase I Dose-finding and Pharmacokinetic Trial of Irinotecan Hydrochloride (CPT-11) Using a Once-Every-Three-Week Dosing Schedule for Patients with Advanced Solid Tumor Malignancy
Clin. Cancer Res., June 1, 2000; 6(6): 2236 - 2244.
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J. G. Slatter, L. J. Schaaf, J. P. Sams, K. L. Feenstra, M. G. Johnson, P. A. Bombardt, K. S. Cathcart, M. T. Verburg, L. K. Pearson, L. D. Compton, et al.
Pharmacokinetics, Metabolism, and Excretion of Irinotecan (CPT-11) Following I.V. Infusion of [14C]CPT-11 in Cancer Patients
Drug Metab. Dispos., April 1, 2000; 28(4): 423 - 433.
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Clin. Cancer Res.Home page
C. J. van Groeningen, W. J. F. Van der Vijgh, J. J. Baars, H. Stieltjes, K. Huibregtse, and H. M. Pinedo
Altered Pharmacokinetics and Metabolism of CPT-11 in Liver Dysfunction: A Need for Guidelines
Clin. Cancer Res., April 1, 2000; 6(4): 1342 - 1346.
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R. Humerickhouse, K. Lohrbach, L. Li, W. F. Bosron, and M. E. Dolan
Characterization of CPT-11 Hydrolysis by Human Liver Carboxylesterase Isoforms hCE-1 and hCE-2
Cancer Res., March 1, 2000; 60(5): 1189 - 1192.
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Clin. Cancer Res.Home page
M. K. Ma, W. C. Zamboni, K. M. Radomski, W. L. Furman, V. M. Santana, P. J. Houghton, S. K. Hanna, A. K. Smith, and C. F. Stewart
Pharmacokinetics of Irinotecan and Its Metabolites SN-38 and APC in Children with Recurrent Solid Tumors after Protracted Low-Dose Irinotecan
Clin. Cancer Res., March 1, 2000; 6(3): 813 - 819.
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C. H. Takimoto, G. Morrison, N. Harold, M. Quinn, B. P. Monahan, R. A. Band, J. Cottrell, A. Guemei, V. Llorens, H. Hehman, et al.
Phase I and Pharmacologic Study of Irinotecan Administered as a 96-Hour Infusion Weekly to Adult Cancer Patients
J. Clin. Oncol., February 1, 2000; 18(3): 659 - 659.
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M. J. A. de Jonge, A. Sparreboom, A. S. T. Planting, M. E. L. van der Burg, M. M. de Boer-Dennert, J. t. Steeg, C. Jacques, and J. Verweij
Phase I Study of 3-Week Schedule of Irinotecan Combined With Cisplatin in Patients With Advanced Solid Tumors
J. Clin. Oncol., January 5, 2000; 18(1): 187 - 187.
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M. J. A. de Jonge, J. Verweij, P. de Bruijn, E. Brouwer, R. H. J. Mathijssen, R. J. van Alphen, M. M. de Boer-Dennert, L. Vernillet, C. Jacques, and A. Sparreboom
Pharmacokinetic, Metabolic, and Pharmacodynamic Profiles in a Dose-Escalating Study of Irinotecan and Cisplatin
J. Clin. Oncol., January 5, 2000; 18(1): 195 - 195.
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M. Brangi, T. Litman, M. Ciotti, K. Nishiyama, G. Kohlhagen, C. Takimoto, R. Robey, Y. Pommier, T. Fojo, and S. E. Bates
Camptothecin Resistance: Role of the ATP-binding Cassette (ABC), Mitoxantrone-resistance Half-Transporter (MXR), and Potential for Glucuronidation in MXR-expressing Cells
Cancer Res., December 1, 1999; 59(23): 5938 - 5946.
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R. F. DeVore, D. H. Johnson, J. Crawford, J. Garst, I. W. Dimery, J. Eckardt, S. G. Eckhardt, G. L. Elfring, L. J. Schaaf, C. K. Hanover, et al.
Phase II Study of Irinotecan Plus Cisplatin in Patients With Advanced Non-Small-Cell Lung Cancer
J. Clin. Oncol., September 1, 1999; 17(9): 2710 - 2710.
[Abstract] [Full Text] [PDF]


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E. Wasserman, C. Cuvier, F. Lokiec, F. Goldwasser, S. Kalla, D. Mery-Mignard, M. Ouldkaci, A. Besmaine, G. Dupont-Andre, M. Mahjoubi, et al.
Combination of Oxaliplatin Plus Irinotecan in Patients With Gastrointestinal Tumors: Results of Two Independent Phase I Studies With Pharmacokinetics
J. Clin. Oncol., June 1, 1999; 17(6): 1751 - 1751.
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V. M.M. Herben, J. H.M. Schellens, M. Swart, G. Gruia, L. Vernillet, J. H. Beijnen, and W. W. ten Bokkel Huinink
Phase I and Pharmacokinetic Study of Irinotecan Administered as a Low-Dose, Continuous Intravenous Infusion Over 14 Days in Patients With Malignant Solid Tumors
J. Clin. Oncol., June 1, 1999; 17(6): 1897 - 1897.
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J. A. Skirvin and V. Relias
Review : Topoisomerase I inhibitors: 2. Irinotecan
Journal of Oncology Pharmacy Practice, June 1, 1998; 4(2): 103 - 116.
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J. G. Slatter, P. Su, J. P. Sams, L. J. Schaaf, and L. C. Wienkers
Bioactivation of the Anticancer Agent CPT-11 to SN-38 by Human Hepatic Microsomal Carboxylesterases and the in Vitro Assessment of Potential Drug Interactions
Drug Metab. Dispos., October 1, 1997; 25(10): 1157 - 1164.
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J. Pharmacol. Exp. Ther.Home page
X.-Y. Chu, Y. Kato, K. Niinuma, K.-I. Sudo, H. Hakusui, and Y. Sugiyama
Multispecific Organic Anion Transporter Is Responsible for the Biliary Excretion of the Camptothecin Derivative Irinotecan and its Metabolites in Rats
J. Pharmacol. Exp. Ther., April 1, 1997; 281(1): 304 - 314.
[Abstract] [Full Text]




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