Pooled Analysis of S-1 Trials in Non-Small Cell Lung Cancer According to Histological Type/ b$ r. {' j* k1 r
NOBUYUKI YAMAMOTO1, TAKEHARU YAMANAKA2, YUKITO ICHINOSE3, KAORU KUBOTA4, HIROSHI SAKAI5, AKIHIKO GEMMA6, NAGAHIRO SAIJO7, MASAHIRO FUKUOKA8 and HISANOBU NIITANI9
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7 a* b5 \1 V Y5 L1Division of Thoracic Oncology, Shizuoka Cancer Center, Shizuoka 411-8777, Japan ; G7 K2 d; B% }' v8 L0 e0 E/ z
2Cancer Biostatistics Laboratory, Institute for Clinical Research, National Kyushu Cancer Center, Fukuoka 811-1395, Japan * v0 r! C! D& o V% b$ T e- Q
3Department of Thoracic Oncology, National Kyushu Cancer Center, Fukuoka 811-1395, Japan 5 u0 x1 H. {# ?- a: P
4Division of Thoracic Oncology, National Cancer Center Hospital, Tokyo 104-0045, Japan
[ @, h6 A9 o/ W# V0 P7 w5Division of Thoracic Oncology, Saitama Cancer Center, Saitama 362-0806, Japan
H8 O% n+ C% i5 h- P1 [ |6Division of Pulmonary Medicine, Infectious Diseases, and Oncology Department of Internal Medicine, Nippon Medical School, Tokyo 113-8603, Japan
/ @2 B3 g: e+ L( q1 x+ ^7Kinki University School of Medicine, Osaka 589-8511, Japan
3 x% p- f L A+ b* Q) V1 e% {3 P8Izumi Municipal Hospital, Osaka 594-0071, Japan
: q' K9 M- W" B* k+ ? P# Y5 q( k9Tokyo Cooperative Oncology Group, Tokyo 105-0013, Japan
9 o9 A( j! d7 R9 M: Q- u& ^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 / d, M1 O* V7 G2 h
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. 6 H; g, H( q' }# P/ p: p& L" F
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