Phase I, pharmacokinetic study of temsirolimus administered orally to patients with advanced cancer.
An oral formulation of temsirolimus (Torisel), an inhibitor of the mammalian target of rapamycin, was evaluated on an intermittent schedule (once daily for 5 days every 2 weeks) in patients with advanced cancer. The maximum tolerated dose was determined to be 75 mg after dose-limiting toxicities of grade 3 elevated aminotransferases (1 patient) and grade 3 rash (1 patient) occurred with a 100-mg dose. The most common temsirolimus-related adverse events were mucositis, rash/maculopapular rash, and asthenia. Six of 12 patients who received the 75-mg dose required dose reductions due to temsirolimus-related adverse events. Two patients who received 75-mg temsirolimus and did not have dose reductions had minor tumor responses. Relative exposure from contributions of both temsirolimus and sirolimus, the principal metabolite, was 17.9% of the 75-mg dose. Thus, oral temsirolimus, 75 mg administered once daily for 5 days every 2 weeks, was further evaluated in patients with metastatic breast cancer.
Buckner
Jan C
JC
Mayo Clinic, Rochester, MN, USA. buckner.jan@mayo.edu
Forouzesh
Bahram
B
Erlichman
Charles
C
Hidalgo
Manuel
M
Boni
Joseph P
JP
Dukart
Gary
G
Berkenblit
Anna
A
Rowinsky
Eric K
EK
D000284:Administration, Oral; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000970:Antineoplastic Agents / Q000008:administration & dosage* / Q000009:adverse effects / Q000493:pharmacokinetics*; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000037:antagonists & inhibitors*; D008297:Male; D020714:Maximum Tolerated Dose; D008875:Middle Aged; D009369:Neoplasms / Q000188:drug therapy*; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors*; D020123:Sirolimus / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D058570:TOR Serine-Threonine Kinases; D016896:Treatment Outcome
D000970:Antineoplastic Agents; D047908:Intracellular Signaling Peptides and Proteins; C401859:temsirolimus; C546842:MTOR protein, human; D017346:Protein Serine-Threonine Kinases; D058570:TOR Serine-Threonine Kinases; D020123:Sirolimus