title: [Patterns and prognostic value of resection margin involvement and lateral pelvic metastases for patients with rectal cancer].
abstract: OBJECTIVE
  To study the patterns and prognostic value of resection margin involvement and lateral pelvic metastases, providing surgeons with pathologic proofs of tumor spread within the studied areas.
  
  
  METHODS
  Large tissue slices of 62 specimens from patients with rectal cancer were used in the pathologic study and the outcomes were followed.
  
  
  RESULTS
  Compared with patients without margin involvement, patients with circumferential margin involvement (CMI), seen in 8 cases (12.9%), had poorer postoperative survival (P=0.003). The 12 patients (19.4%) with lateral pelvic metastases suffered poorer survival, compared with those without lateral pelvic metastases (P=0.026). Eight patients (66.7%) were diagnosed to have single lateral pelvic region involved, while the other 4 had multiple regions involved. The incidence of lateral metastases differed among regions, with higher occurrence in the root of middle rectal artery (6/12, 50.0%), area of the internal iliac artery (4/12, 33.3%) and the obturator region (3/12, 25.0%).
  
  
  CONCLUSIONS
  Occurrence of CMI or lateral metastases in rectal cancer patients predispose poor survival, thus a more radical clearance and postoperative adjuvant therapy are recommended.
authors.affiliation: Institute of Digestive Surgery, West China Hospital, Sichuan University, Chengdu 610041, China.
authors.forename: Cun
authors.initials: C
authors.lastname: Wang
authors.forename: Zong-guang
authors.initials: ZG
authors.lastname: Zhou
authors.forename: Dan
authors.initials: D
authors.lastname: Xu
authors.forename: Yong-yang
authors.initials: YY
authors.lastname: Yu
authors.forename: Zhong
authors.initials: Z
authors.lastname: Cheng
authors.forename: Li
authors.initials: L
authors.lastname: Li
mesh_terms: D000328:Adult; D000368:Aged; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008643:Mesentery / Q000473:pathology; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009362:Neoplasm Metastasis; D009367:Neoplasm Staging; D010388:Pelvis / Q000473:pathology; D012004:Rectal Neoplasms / Q000401:mortality* / Q000473:pathology*