Pooled Analysis of S-1 Trials in Non-Small Cell Lung Cancer According to Histological Type% J" B+ D N! N7 e) g: q7 x2 D
NOBUYUKI YAMAMOTO1, TAKEHARU YAMANAKA2, YUKITO ICHINOSE3, KAORU KUBOTA4, HIROSHI SAKAI5, AKIHIKO GEMMA6, NAGAHIRO SAIJO7, MASAHIRO FUKUOKA8 and HISANOBU NIITANI9
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1 [) \1 d# y* [ X1Division of Thoracic Oncology, Shizuoka Cancer Center, Shizuoka 411-8777, Japan
6 I: n1 g7 @+ g9 g8 L( \8 C2Cancer Biostatistics Laboratory, Institute for Clinical Research, National Kyushu Cancer Center, Fukuoka 811-1395, Japan # e3 T \1 q: c+ K* P3 [, }4 R
3Department of Thoracic Oncology, National Kyushu Cancer Center, Fukuoka 811-1395, Japan
+ S+ I# ~4 D' D7 Y2 i4Division of Thoracic Oncology, National Cancer Center Hospital, Tokyo 104-0045, Japan
8 f# v J2 c2 f" L8 y, B/ b. n5Division of Thoracic Oncology, Saitama Cancer Center, Saitama 362-0806, Japan
: G! u7 t& v M3 q6Division of Pulmonary Medicine, Infectious Diseases, and Oncology Department of Internal Medicine, Nippon Medical School, Tokyo 113-8603, Japan
, K% x( v% m& ~9 G6 m7Kinki University School of Medicine, Osaka 589-8511, Japan 5 I; R* I6 O( G" c7 G' _, ~
8Izumi Municipal Hospital, Osaka 594-0071, Japan * D# D0 p2 r/ K, z8 ^ M
9Tokyo Cooperative Oncology Group, Tokyo 105-0013, Japan
& t+ ?- L/ {" m4 @1 |# b: JCorrespondence 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
/ `7 i" {7 ^' Z; T) wAbstractBackground: 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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