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Clinical significance of revised microscopic positive resection margin status in ductal adenocarcinoma of pancreatic head.

Abstract：

Purpose:Recent studies have suggested microscopic positive resection margin should be revised according to the presence of tumor cells within 1mm of the margin surface in resected specimens of pancreatic cancer. However, the clinical meaning of this revised margin status for R1 resection margin was not fully clarified. Methods:From July 2012 to December 2014, the medical records of 194 consecutive patients who underwent pancreaticoduodenectomy for ductal adenocarcinoma of the pancreatic head were analyzed retrospectively. They were divided into 3 groups on margin status; revised microscopic negative margin (rR0) - tumor exists more than 1 mm from surgical margin, revised microscopic positive margin (rR1) - tumor present within less than 1 mm from surgical margin, classic microscopic positive margin (cR1) - tumor is exposed to surgical margin. Results:There were 76 rR0 (39.2%), 100 rR1 (51.5%), and 18 cR1 (9.3%). There was significant difference in disease-free survival rates between cR1 vs. rR1 (8.4 months vs. 24.0 months, P = 0.013). Margin status correlated with local recurrence rate (17.1% in rR0, 26.0% in rR1, and 44.4% in cR1, P = 0.048). There is significant difference in recurrence at tumor bed (11.8% in rR0 vs. 23.0 in rR1, P = 0.050). Of rR1, adjuvant treatment was found to be an independent risk factor for local recurrence (hazard ratio, 0.297; 95% confidence interval, 0.127-0.693, P = 0.005). Conclusion:Revised R1 resection margin (rR1) affects recurrence at the tumor bed. Adjuvant treatment significantly reduced local recurrence of rR1. Accordingly, adjuvant chemoradiation for rR1 group should be taken into account.

journal_name

Ann Surg Treat Res

journal_title

Annals of surgical treatment and research

authors

You Y,Choi DW,Heo JS,Han IW,Choi SH,Jang KT,Han S,Han SH

doi

10.4174/astr.2019.96.1.19

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

19-26

issue

1

eissn

2288-6575

issn

2288-6796

journal_volume

96

pub_type

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