作者
Shiro Oka,Shinji Tanaka,Yoshiki Kajiwara,Shôichi Saito,Yosuke Fukunaga,Manabu Takamatsu,Hiroshi Kawachi,Kinichi Hotta,Hiroaki Ikematsu,Masayasu Kojima,Yutaka Saito,Masayoshi Yamada,Yukihide Kanemitsu,Shigeki Sekine,Shinji Nagata,Kazutoyo Yamada,Nozomu Kobayashi,Soichiro Ishihara,Yusuke Saitoh,Kenji Matsuda,Kazutomo Togashi,Koji Kono,Megumi Ishiguro,Toshio Kuwai,Takashi Okuyama,Akihiro Ohuchi,Shinobu Ohnuma,Kazuhiro Sakamoto,Tamotsu Sugai,Kenji Katsumata,Hirokazu Matsushita,Hiro‐o Yamano,Hirotsugu Eda,Toshio Uraoka,Naohiko Akimoto,Hirotoshi Kobayashi,Kenichi Sugihara,Hideki Ueno
摘要
To verify the value of the pathological criteria for additional treatment in locally resected pT1 colorectal carcinoma (CRC) which have been used in the Japanese Society for Cancer of the Colon and Rectum (JSCCR) guidelines since 2009.We enrolled 4,719 patients with pT1 CRC treated at 27 institutions between July 2009 and December 2016 (1,259 patients with local resection alone [group A], 1,508 patients with additional surgery after local resection [group B], and 1,952 patients with surgery alone [group C]). All 5 factors of the JSCCR guidelines (submucosal resection margin, tumor histologic grade, submucosal invasion depth, lymphovascular invasion, and tumor budding) for lymph node metastasis (LNM) had been diagnosed prospectively.Any of the risk factors were present in 3,801 patients. The LNM incidence was 10.3% (95% confidence interval 9.3-11.4) in group B/C patients with risk factors, whereas it was 1.8% (95% confidence interval 0.4-5.2) in those without risk factors ( P < 0.01). In group A, the incidence of recurrence was 3.4% in patients with risk factors, but it was only 0.1% in patients without risk factors ( P < 0.01). The disease-free survival rate of group A patients classified as risk positive was significantly worse than those of groups B and C patients. However, the 5-year disease-free survival rate in group A patients with no risk was 99.2%.Our large-scale real-world multicenter study demonstrated the validity of the JSCCR criteria for pT1 CRC after local resection, especially regarding favorable outcomes in patients with low risk of LNM.