title: Micropapillary pattern at the invasive front and its association with unresectable colorectal carcinomas.
abstract: Unresectable colorectal carcinomas (CRCs) as considered incurable even if the primary tumors and the metastatic ones can undergo resection are correlated with poor prognosis. We evaluated the association between micropapillary pattern at the invasive front and unresectable CRCs. Thirty-four out of 264 (12.9%) CRC patients with stages III and IV were unresectable cases. The patients with unresectable CRCs had significantly worse survival than those with resectable CRCs (P < 0.001). Micropapillary pattern was evident in 12 (4.5%) out of 264 cases. This pattern was observed in 6 of 34 (17.6%) unresectable CRCs and in 6 of 230 (2.6%) resectable cases (P = 0.002). Unresectable CRCs revealed more frequently deeper invasion (odds ratio (OR), 1.175; 95% confidence interval (CI), 1.113-1.241), lymph node metastasis (OR, 2.356; 95% CI, 1.132-4.905), and presence of micropapillary pattern at the invasive front (OR, 8.000; 95% CI, 2.415-26.504) as compared to resectable cases. By multivariable logistic regression analysis, only micropapillary pattern was shown to be an independent predictor of unresectable CRCs (OR, 9.451; 95% CI, 2.468-36.196; P < 0.001). In conclusion, micropapillary pattern at the invasive front is associated with unresectable CRCs, and detection of it could help identify unresectable CRC cases.
authors.affiliation: Department of Gastroenterology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603, Japan ; Department of Surgical and Molecular Pathology, Dokkyo Medical University, School of Medicine, 880 Kitakobayashi, Mibu, Shimotsuga, Tochigi 321-0293, Japan ; Department of Pathology and Integrative Oncological Pathology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603, Japan.
authors.forename: Naohiko
authors.initials: N
authors.lastname: Akimoto
authors.forename: Takahiro
authors.initials: T
authors.lastname: Fujimori
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Mitomi
authors.forename: Kazuhito
authors.initials: K
authors.lastname: Ichikawa
authors.forename: Shigeki
authors.initials: S
authors.lastname: Tomita
authors.forename: Atsushi
authors.initials: A
authors.lastname: Tatsuguchi
authors.forename: Shunji
authors.initials: S
authors.lastname: Fujimori
authors.forename: Zenya
authors.initials: Z
authors.lastname: Naito
authors.forename: Choitsu
authors.initials: C
authors.lastname: Sakamoto
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002277:Carcinoma / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness / Q000473:pathology; D016896:Treatment Outcome