Dose-escalation study of pemetrexed in combination with carboplatin followed by pemetrexed maintenance therapy for advanced non-small cell lung cancer.
BACKGROUND
The primary objectives of this study were to determine the recommended dose of pemetrexed and carboplatin in patients with chemo-naive advanced non-small cell lung cancer (NSCLC).


METHODS
Patients received escalated doses of carboplatin area under the concentration-time curve (AUC) of 5 (cohort 1) or 6 (cohort 2) and pemetrexed 500 mg/m(2) every 3 weeks for six cycles. For patients with objective response and stable disease, pemetrexed were continued until disease progression or unacceptable toxicity.


RESULTS
In cohort 1, a dose-limiting toxicity (DLT) was observed in one of the six patients: grade 4 thrombocytopenia. No DLTs were seen in the first 6 patients of cohort 2, and thus the combination of pemetrexed 500 mg/m(2) plus carboplatin at AUC 6 was determined as the recommended dose. Among a total of 20 patients, 8 patients received a median of four cycles of pemetrexed monotherapy in a maintenance setting without unexpected or cumulative toxicities. No complete responses and 12 partial responses were observed, giving an overall response rate of 60.0% [95% confidence interval (CI), 36.1-80.9%]. Median progression-free survival time for all patients was 7.6 months (95% CI: 4.8-8.0 months).


CONCLUSIONS
Pemetrexed 500 mg/m(2) plus carboplatin AUC 6 combination therapy followed by pemetrexed maintenance therapy, is generally tolerable, and shows encouraging antitumor activity in chemotherapy-naive patients with advanced NSCLC.
Okamoto
Isamu
I
Department of Medical Oncology, Kinki University School of Medicine, 377-2 Ohno-higashi, Osaka-Sayama, Osaka 589-8511, Japan. chi-okamoto@dotd.med.kindai.ac.jp
Takeda
Koji
K
Daga
Haruko
H
Miyazaki
Masaki
M
Yonesaka
Kimio
K
Kiyota
Hidemi
H
Tsurutani
Junji
J
Ueda
Shinya
S
Ichikawa
Yasuko
Y
Takeda
Masayuki
M
Sekiguchi
Risa
R
Tominaga
Kiyomi
K
Enatsu
Sotaro
S
Nambu
Yoshihiro
Y
Nakagawa
Kazuhiko
K
D000328:Adult; D000368:Aged; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D019540:Area Under Curve; D016190:Carboplatin / Q000008:administration & dosage* / Q000009:adverse effects; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy* / Q000473:pathology / Q000503:physiopathology; D018450:Disease Progression; D018572:Disease-Free Survival; D005260:Female; D005971:Glutamates / Q000008:administration & dosage* / Q000009:adverse effects; D006147:Guanine / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives*; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy* / Q000473:pathology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D000068437:Pemetrexed; D013921:Thrombocytopenia / Q000209:etiology
D005971:Glutamates; D000068437:Pemetrexed; D006147:Guanine; D016190:Carboplatin