Pooled Analysis of S-1 Trials in Non-Small Cell Lung Cancer According to Histological Type/ `+ I. {2 J* l" `+ w
NOBUYUKI YAMAMOTO1, TAKEHARU YAMANAKA2, YUKITO ICHINOSE3, KAORU KUBOTA4, HIROSHI SAKAI5, AKIHIKO GEMMA6, NAGAHIRO SAIJO7, MASAHIRO FUKUOKA8 and HISANOBU NIITANI9 ! c; Q+ i+ y: f4 Z+ O4 x# E
+ Author Affiliations& ^2 o S8 }& j% U7 L
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1Division of Thoracic Oncology, Shizuoka Cancer Center, Shizuoka 411-8777, Japan 0 J G& _$ v) n1 n
2Cancer Biostatistics Laboratory, Institute for Clinical Research, National Kyushu Cancer Center, Fukuoka 811-1395, Japan
4 z' ]$ W, `1 U9 R2 \% Z; D" Z) S3Department of Thoracic Oncology, National Kyushu Cancer Center, Fukuoka 811-1395, Japan $ ]8 b4 }2 O% M- H
4Division of Thoracic Oncology, National Cancer Center Hospital, Tokyo 104-0045, Japan 1 i5 ~9 c- Z4 R+ a) }2 X. o' d1 {
5Division of Thoracic Oncology, Saitama Cancer Center, Saitama 362-0806, Japan
' ]5 d) [& N4 m, G6Division of Pulmonary Medicine, Infectious Diseases, and Oncology Department of Internal Medicine, Nippon Medical School, Tokyo 113-8603, Japan
) `8 A) k' P3 a# y( s7Kinki University School of Medicine, Osaka 589-8511, Japan
" V$ f Q0 j9 R/ _$ j8Izumi Municipal Hospital, Osaka 594-0071, Japan
# ?8 ~+ h9 A2 C$ O+ w3 z9Tokyo Cooperative Oncology Group, Tokyo 105-0013, Japan
+ O& P/ n6 A5 rCorrespondence to: Nobuyuki Yamamoto, Division of Thoracic Oncology, Shizuoka Cancer Center, 1007 Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka 411-8777, Japan. Tel: +81 559895222, Fax: +81 559895783, e-mail: n.yamamoto@scchr.jp
6 u z! g2 U* AAbstractBackground: The antimetabolic agent S-1 inhibits thymidylate synthase similar to pemetrexed, but through a different mechanism of action. Whether the antitumour activity of S-1 depends on histological type remains unclear. We analysed pooled data from 2 phase II clinical studies of cisplatin and S-1 in patients with previously untreated advanced non-small cell lung cancer. Patients and Methods: We comprised 110 patients with stage IIIB or IV non–small cell lung cancer. Univariate and multivariate analyses were performed to determine the effects of histological type on progression-free survival and response rates. Results: On pooled analysis of the data, according to histological type, median progression-free survival was 3.8 months in patients with squamous cell carcinoma and 4.4 months in those with non-squamous cell carcinoma. Both analyses showed that progression-free survival and response rate did not differ significantly. Conclusion: Unlike molecular targeted agents and pemetrexed, a combination of cisplatin and S-1 may be no difference in response according to histological type.
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