Phase 1 trial of temozolomide plus irinotecan plus O6-benzylguanine in adults with recurrent malignant glioma.
BACKGROUND
The current study was a phase 1 clinical trial conducted with patients who had recurrent or progressive malignant glioma (MG). The trial was designed to determine the maximum tolerated dose (MTD) and toxicity of irinotecan (CPT-11) when administered with temozolomide (TMZ) and O(6)-benzylguanine (O(6)-BG).


METHODS
All 3 drugs, CPT-11, TMZ, and O(6)-BG, were administered on Day 1 of a 21-day treatment. First, patients were treated with a 1-hour bolus infusion of O(6)-BG at a dose of 120 mg/m(2) followed immediately by a 48-hour continuous infusion of O(6)-BG at a dose of 30 mg/m(2)/d. Second, within 60 minutes of the end of the 1-hour bolus infusion of O(6)-BG, TMZ was administered orally at a dose of 355 mg/m(2). Third, 1 hour after administration of TMZ, CPT-11 was infused over 90 minutes. Patients were accrued to 1 of 2 strata based on CYP3A1- and CYP3A4-inducing antiepileptic drug (EIAED) use; dose escalation was conducted independently within these strata.


RESULTS
Fifty-five patients were enrolled. In both strata, the dose-limiting toxicities were hematologic and included grade 4 neutropenia, febrile neutropenia, leukopenia, and/or thrombocytopenia. For Stratum 1 (EIAEDs), when TMZ was administered at a dose of 355 mg/m(2), the MTD of CPT-11 was determined to be 120 mg/m(2). In contrast, for Stratum 2 (no EIAEDs), when TMZ was administered at a dose of 200 mg/m(2), the MTD of CPT-11 was determined to be 80 mg/m(2).


CONCLUSIONS
The authors believe that the results of the current study provide the foundation for a phase 2 trial of O(6)-BG in combination with CPT-11 and TMZ in patients with MG.
Quinn
Jennifer A
JA
Department of Surgery, Duke University Medical Center, Durham, North Carolina, USA.
Jiang
Sara Xiaoyin
SX
Reardon
David A
DA
Desjardins
Annick
A
Vredenburgh
James J
JJ
Gururangan
Sridharan
S
Sampson
John H
JH
McLendon
Roger E
RE
Herndon
James E
JE
Friedman
Henry S
HS
D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000009:adverse effects / Q000627:therapeutic use*; D001932:Brain Neoplasms / Q000188:drug therapy*; D002166:Camptothecin / Q000008:administration & dosage / Q000031:analogs & derivatives*; D003606:Dacarbazine / Q000008:administration & dosage / Q000031:analogs & derivatives*; D018572:Disease-Free Survival; D005260:Female; D005910:Glioma / Q000188:drug therapy*; D006147:Guanine / Q000008:administration & dosage / Q000031:analogs & derivatives*; D006801:Humans; D000077146:Irinotecan; D008297:Male; D020714:Maximum Tolerated Dose; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local; D000077204:Temozolomide
C064976:O(6)-benzylguanine; D006147:Guanine; D000077146:Irinotecan; D003606:Dacarbazine; D002166:Camptothecin; D000077204:Temozolomide