| Pooled Analysis of S-1 Trials in Non-Small Cell Lung Cancer According to Histological Type 1 h& C2 f0 x; }- y- ANOBUYUKI YAMAMOTO1, TAKEHARU YAMANAKA2, YUKITO ICHINOSE3, KAORU KUBOTA4, HIROSHI SAKAI5, AKIHIKO GEMMA6, NAGAHIRO SAIJO7, MASAHIRO FUKUOKA8 and HISANOBU NIITANI9 2 U1 v" f% t2 n7 r; s
 + Author Affiliations
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 $ ~5 ]. ^( G& _( Q& H5 y5 `1Division of Thoracic Oncology, Shizuoka Cancer Center, Shizuoka 411-8777, Japan
 , C0 V: V9 h9 C* ?) v  W2Cancer Biostatistics Laboratory, Institute for Clinical Research, National Kyushu Cancer Center, Fukuoka 811-1395, Japan
 4 E% }8 R: B, I3Department of Thoracic Oncology, National Kyushu Cancer Center, Fukuoka 811-1395, Japan
 ' C1 N! D8 \; L) E* X4Division of Thoracic Oncology, National Cancer Center Hospital, Tokyo 104-0045, Japan ( K) G- {7 s, g, h' V
 5Division of Thoracic Oncology, Saitama Cancer Center, Saitama 362-0806, Japan 3 y" o( Q& z% Y" q6 }9 p
 6Division of Pulmonary Medicine, Infectious Diseases, and Oncology Department of Internal Medicine, Nippon Medical School, Tokyo 113-8603, Japan
 / @" b; d: z1 n$ R7Kinki University School of Medicine, Osaka 589-8511, Japan 8 M2 h( H* L4 Z9 _8 l- M# k
 8Izumi Municipal Hospital, Osaka 594-0071, Japan 9 f! {! {6 _6 Y/ A
 9Tokyo Cooperative Oncology Group, Tokyo 105-0013, Japan 2 E6 L5 Y: e8 s! t, ~1 ~. W
 Correspondence 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 0 C$ b4 r" v% b" C. q7 Q
 AbstractBackground: 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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