Background: Generally, Semaphorins are secretary or transmembrane-bound molecules that act as axon guidance cues in the nervous system. Recent research showed increased expression of semaphorin 3C correlates with cancers that possess higher invasive and metastatic characteristics. For example, in breast cancer, inhibition of semaphorin 3C reduces adhesion and invasion. The aim of this study was to evaluate a possibility that semaphorin 3C might be a new prognostic marker in colorectal cancer.

Material and methods: We used two cohorts. Cohort 1 was the 192 patients with colorectal cancer resected surgically between 2009 and 2010. We used GSE 14333 dataset as Cohort 2 which included 226 patients with the colorectal cancer. In each cohorts, we divided the patients in to the two groups i.e., high or low semaphorin 3C expression group using receiver operating characteristic (ROC) curve based on the information of the recurrence of colorectal cancer. Disease-free-survival (DFS) rates were calculated using Kaplan-Meier methods. Differences between curves were evaluated with the log-rank test.

Results: In the cohort 1, the DFS in the patients with higher expression was worse than that in the patients with lower expression (P = 0.0467). Semaphorin 3C has two probes (203788_s_at and 203789_s_at) in GSE14333. In the cohort 2, using each two probe of semaphorin 3C, the DFS in the patients with higher expression was worse than that of those patients with lower expression (P = 0.0015 and P = 0.0003).

Conclusions: This study suggested that Semaphorin 3C might be a new prognostic marker in colorectal cancer.

Citation Format: Shingo Kawano, Kota Amemiya, Yuki Tsuchiya, Toshiaki Hagiwara, Hirokazu Matsuzawa, Yurika Makino, Shunsuke Motegi, Ryoichi Tsukamoto, Ryosuke Ichikawa, Kazumasa Kure, Kumpei Honjo, Hisashi Ro, Shingo Ito, Yu Okazawa, Rina Takahashi, Kosuke Mizukoshi, Masaya Kawai, Shinya Munakata, Koichiro Niwa, Shun Ishiyama, Kiichi Sugimoto, Hirohiko Kamiyama, Hiromitsu Komiyama, Makoto Takahashi, Yutaka Kojima, Michitoshi Goto, Atsushi Okuzawa, Yuichi Tomiki, Kazuhiro Sakamoto, Motohiro Kojima, Atsushi Ochiai. Semaphorin 3C has a possibility of a new prognostic marker in colorectal cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 2256. doi:10.1158/1538-7445.AM2017-2256