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Related Experiment Video

Updated: Feb 25, 2026

Robot-assisted Total Mesorectal Excision and Lateral Pelvic Lymph Node Dissection for Locally Advanced Middle-low Rectal Cancer
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[R1 resection in rectal cancer].

H-R Raab1

  • 1, Elisabethstrasse 14, 26135, Oldenburg, Deutschland. R-Raab@t-online.de.

Der Chirurg; Zeitschrift Fur Alle Gebiete Der Operativen Medizen
|August 4, 2017
PubMed
Summary
This summary is machine-generated.

Achieving negative margins in rectal cancer surgery is crucial. Proper surgical technique, focusing on the circumferential resection margin (CRM), is key to preventing local recurrence and improving patient outcomes.

Keywords:
Circumferential resection marginNeoadjuvant therapyR0 closeR0 wideSurgical technique

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Area of Science:

  • Oncology
  • Surgical Oncology
  • Gastrointestinal Surgery

Background:

  • R1 resections in rectal cancer, defined by tumor proximity to the circumferential resection margin (CRM), are associated with higher local recurrence, distant metastases, and poorer prognosis.
  • Current guidelines differentiate R0 resections into R0 wide (≥1 mm) and R0 close (<1 mm), highlighting the critical importance of CRM status.

Purpose of the Study:

  • To emphasize the decisive role of surgical technique in achieving negative margins (R0) during rectal cancer resection.
  • To underscore the necessity of standardized surgical preparation and potential deviation from anatomical planes to ensure complete tumor removal.

Main Methods:

  • Standardized radical preparation along boundary layers and envelope fascia.
  • En bloc resection of adjacent structures when necessary to achieve negative margins.
  • Evaluation of neoadjuvant therapy's role in reducing R1 situations.

Main Results:

  • Surgical technique is the primary determinant in avoiding R1 resections.
  • Neoadjuvant therapy can reduce R1 situations but cannot overcome inadequate surgical procedures.
  • Tumor proximity to the CRM significantly increases risks, necessitating clear margin definitions.

Conclusions:

  • Optimal surgical technique is paramount for achieving negative circumferential resection margins (CRM) in rectal cancer.
  • While neoadjuvant therapy aids in reducing positive margins, it cannot substitute for meticulous surgical execution.
  • Adherence to guidelines differentiating R0 wide, R0 close, and R1 resections is essential for improved rectal cancer management.