A phase I dose-escalation study of imatinib mesylate (Gleevec/STI571) plus capecitabine (Xeloda) in advanced solid tumors.
The aim of this study was to determine the maximally tolerated dose, recommended phase II dose and toxicity profile of capecitabine plus imatinib mesylate combination.


METHODS
Twenty-four patients with advanced solid tumors were treated with capecitabine twice daily on days 1-14 and imatinib mesylate once daily on a 21-day cycle. Dose-limiting toxicity was assessed during the first cycle. Treatment continued until disease progression or undesirable toxicity.


RESULTS
Six patients were treated with capecitabine at 1000 mg/m(2) and imatinib mesylate 300 mg; unacceptable toxicity due to grade 2 intolerable hand-foot syndrome and/or grade > or = 2 diarrhea was observed. Doses were subsequently reduced to capecitabine at 750 mg/m(2) and imatinib mesylate at 300 mg; toxicities were better tolerated at the lower dose. Dose-limiting toxicities consisted of grade 3 diarrhea, anorexia and fatigue lasting > or = 4 days. Treatment-related adverse events greater than or equal to grade 3 included anemia, diarrhea, dysuria, hypophosphatemia and vertigo. Minor responses were observed in two patients: stable disease > or = 6 months was observed in two out of twenty-one evaluable patients.


CONCLUSIONS
Full doses of capecitabine and imatinib mesylate were not tolerable. The maximum tolerated dose and the recommended phase II dose for this drug combination is capecitabine at 750 mg/m(2) twice daily for 1-14 days and imatinib at 300 mg once daily on a 21-day cycle.
Dugan
Elizabeth
E
Duke University Medical Center, Durham, North Carolina 27710, USA.
Truax
Roxanne
R
Meadows
Kellen L
KL
Nixon
Andrew B
AB
Petros
William P
WP
Favaro
Justin
J
Fernando
Nishan H
NH
Morse
Michael A
MA
Blobe
Gerard C
GC
Hurwitz
Herbert I
HI
D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000008:administration & dosage* / Q000009:adverse effects*; D000077214:Becaplermin; D001549:Benzamides; D000069287:Capecitabine; D015331:Cohort Studies; D003841:Deoxycytidine / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives; D004334:Drug Administration Schedule; D005260:Female; D005472:Fluorouracil / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives; D006801:Humans; D000068877:Imatinib Mesylate; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000097:blood / Q000188:drug therapy* / Q000652:urine; D018919:Neovascularization, Physiologic / Q000187:drug effects; D010879:Piperazines / Q000008:administration & dosage / Q000009:adverse effects; D010982:Platelet-Derived Growth Factor / Q000378:metabolism; D020574:Proto-Oncogene Proteins c-sis; D011743:Pyrimidines / Q000008:administration & dosage / Q000009:adverse effects; D012867:Skin / Q000098:blood supply
D001549:Benzamides; D010879:Piperazines; D010982:Platelet-Derived Growth Factor; D020574:Proto-Oncogene Proteins c-sis; D011743:Pyrimidines; C075278:platelet-derived growth factor A; D003841:Deoxycytidine; D000077214:Becaplermin; D000069287:Capecitabine; D000068877:Imatinib Mesylate; D005472:Fluorouracil