Abstract
This study aimed to investigate the impact of the inferior mesenteric artery (IMA) lymph node metastasis [IMALN (+)] on prognosis in left-sided colorectal cancer (LCRC). A total of 285 patients with stage III LCRC and 118 patients with stage IV LCRC who underwent resection of primary tumor between 2005 and 2016 were included. IMALN (+) patients (n=10) had worse overall survival (OS) than patients without IMA lymph node metastasis [IMALN (-); n=275] in stage III LCRC (p=0.007). Multivariate analysis revealed that IMALN (+) was a prognostic factor in stage III LCRC (OS, HR=3.09, p=0.043). Conversely, there was no difference between the OS of IMALN (+) and stage IV LCRC with distant lymph node metastasis only [stage IV LCRC (LYM); n=21; p=0.434]. The prognosis of IMALN (+) was worse than that of IMALN (-); it was similar to that of stage IV LCRC (LYM).
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