Phase I study of irinotecan and raltitrexed in patients with advanced gastrointestinal tract adenocarcinoma.
To determine the dose-limiting toxicities (DLT) and maximum tolerated dose (MTD) of irinotecan and raltitrexed given as sequential short infusions every 3 weeks, 33 patients with pretreated gastrointestinal adenocarcinoma (31 colorectal, 2 oesophagogastric) entered this open label dose-escalation study. For the first five dose levels patients received irinotecan 175-350 mg m(-2) followed by raltitrexed 2.6 mg m(-2). Level VI was irinotecan 350 mg m(-2) plus raltitrexed 3.0 mg m(-2), level VII was irinotecan 400 mg m(-2) plus raltitrexed 2.6 mg m(-2); 261 courses were administered. Only one patient at dose levels I-V experienced DLT. At level VI, 5/12 patients experienced DLT: one had grade 3 diarrhoea and lethargy, one had grade 4 diarrhoea and one had lethargy alone. Two others had lethargy caused by disease progression. There was no first-cycle neutropenia. At level VII, 3/6 patients experienced dose-limiting lethargy, one also had grade 3 diarrhoea. Dose intensity fell from over 90% for both drugs at level VI to 83% for irinotecan and 66% for raltitrexed at level VII. Lethargy was therefore the DLT, and level VII the MTD. Pharmacokinetic data showed no measurable drug interaction; 6/30 patients (20%) had objective responses. This combination is active with manageable toxicity. Recommended doses for further evaluation are irinotecan 350 mg m(-2) and raltitrexed 3.0 mg m(-2).
Ford
H E
HE
Department of Medicine, CRC Centre for Cancer Therapeutics, Institute of Cancer Research, Sutton, Surrey, UK.
Cunningham
D
D
Ross
P J
PJ
Rao
S
S
Aherne
G W
GW
Benepal
T S
TS
Price
T
T
Massey
A
A
Vernillet
L
L
Gruia
G
G
D000230:Adenocarcinoma / Q000188:drug therapy* / Q000401:mortality; D000293:Adolescent; D000328:Adult; D000368:Aged; D000964:Antimetabolites, Antineoplastic / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000009:adverse effects / Q000493:pharmacokinetics / Q000627:therapeutic use*; D002166:Camptothecin / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000188:drug therapy* / Q000401:mortality; D006801:Humans; D000077146:Irinotecan; D008297:Male; D008875:Middle Aged; D011799:Quinazolines / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics; D015996:Survival Rate; D013876:Thiophenes / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics; D016896:Treatment Outcome
D000964:Antimetabolites, Antineoplastic; D000972:Antineoplastic Agents, Phytogenic; D011799:Quinazolines; D013876:Thiophenes; D000077146:Irinotecan; C068874:raltitrexed; D002166:Camptothecin