Long-term outcomes of surgery alone versus surgery following preoperative chemoradiotherapy for early T3 rectal cancer: A propensity score analysis

Seung Hyun Cho, Gyu Seog Choi, Gab Chul Kim, An Na Seo, Hye Jung Kim, Won Hwa Kim, Kyung Min Shin, So Mi Lee, Hunkyu Ryeom, See Hyung Kim

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Recently, a few studies have raised the question of whether preoperative chemoradiotherapy (PCRT) is essential for all T3 rectal cancers. This case-matched study aimed to compare the long-term outcomes of surgery alone with those of PCRT+surgery for magnetic resonance imaging (MRI)-assessed T3ab (extramural depth of invasion ≤5mm) and absent mesorectal fascia invasion (clear MRF) in mid/lower rectal cancer patients. From January 2006 to November 2012, 203 patients who underwent curative surgery alone (n=118) or PCRT+surgery (n=85) were enrolled in this retrospective study. A 1:1 propensity score-matched analysis was performed to eliminate the inherent bias. Case-matching covariates included age, sex, body mass index, histologic grade, carcinoembryonic antigen, operation method, follow-up period, tumor height, and status of lymph node metastasis. The end-points were the 5-year local recurrence (LR) rate and disease-free-survival (DFS). After propensity score matching, 140 patients in 70 pairs were included. Neither the 5-year LR rate nor the DFS was significantly different between the 2 groups (the 5-year LR rate, P=0.93; the 5-year DFS, P=0.94). The 5-year LR rate of the surgery alone was 2% (95% confidence interval [CI] 0.2%-10.9%) versus 2% (95% CI 0.2%-10.1%) in the PCRT+surgery group. The 5-year DFS of the surgery alone was 87% (95% CI 74.6%-93.7%) versus 88% (95% CI 77.8%-93.9%) in the PCRT+surgery group. In patients with MRI-assessed T3ab and clear MRF mid/lower rectal cancer, the long-term outcomes of surgery alone were comparable with those of the PCRT+surgery. The suggested MRI-assessed T3ab and clear MRF can be used as a highly selective indication of surgery alone in mid/lower T3 rectal cancer. Additionally, in those patients, surgery alone can be tailored to the clinical situation.

Original languageEnglish
Article numbere6362
JournalMedicine (United States)
Volume96
Issue number12
DOIs
StatePublished - 2017

Keywords

  • Chemoradiotherapy
  • MRI
  • Prognosis
  • Rectal cancer
  • Rectum

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