Prognostic impact of R1 resection margin in synchronous and simultaneous colorectal liver metastasis resection: a retrospective cohort study

• Published in: World journal of surgical oncology 2023-06, Vol.21 (1), p.169-169, Article 169
• Main Authors: Kim, Na Reum, Alhothaifi, Essam Dhafer, Han, Dai Hoon, Choi, Jin Sub, Choi, Gi Hong
• Format: Article
• Language: English
• Subjects: Cancer; Cancer therapies; Care and treatment; Chemotherapy; Cohort analysis; Colorectal cancer; Colorectal cancer liver metastasis; Colorectal carcinoma; Colorectal surgery; Diagnosis; Disease; Hepatectomy; Laparoscopy; Lesions; Liver; Liver cancer; Long-term outcome; Matching; Metastases; Metastasis; Multidisciplinary teams; Patient outcomes; Patients; Prevention; Prognostic factor; R1 resection; Risk factors; Robotics; Surgeons; Surgical outcomes; Survival; Tumors; Ultrasonic imaging
• ISSN: 1477-7819; 1477-7819
• DOI: 10.1186/s12957-023-03042-5

A margin ≥ 1 mm is considered a standard resection margin for colorectal liver metastasis (CRLM). However, microscopic incomplete resection (R1) is not rare since aggressive surgical resection has been attempted in multiple and bilobar CRLM. This study aimed to investigate the prognostic impact of resection margins and perioperative chemotherapy in patients with CRLM. A total of 368 of 371 patients who underwent simultaneous colorectal and liver resection for synchronous CRLM between 2006 and June 2017, excluding three R2 resections, were included in this study. R1 resection was defined as either abutting tumor on the resection line or involved margin in the pathological report. The patients were divided into R0 (n = 304) and R1 (n = 64) groups. The clinicopathological characteristics, overall survival, and intrahepatic recurrence-free survival were compared between the two groups using propensity score matching. The R1 group had more patients with ≥ 4 liver lesions (27.3 vs. 50.0%, P