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When is local excision appropriate for "early" rectal cancer?

Kotaro Maeda1, Yoshikazu Koide, Hidetoshi Katsuno

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Local excision for early rectal cancer is debated due to recurrence. Selecting T1 tumors with low risk factors like submucosal invasion <1,000 μm is key for curative surgery.

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Area of Science:

  • Colorectal Surgery
  • Oncology
  • Gastroenterology

Background:

  • Local excision for early rectal cancer is common in the US but controversial in Western countries due to local recurrence.
  • Recurrence is linked to tumor type, surgical procedure, and positive surgical margins.

Purpose of the Study:

  • To review inclusion criteria for local excision of early rectal cancer.
  • To compare Western and Japanese perspectives on patient selection for local excision.

Main Methods:

  • Review of literature focusing on criteria for "early" rectal cancer (T1).
  • Analysis of risk factors (tumor grade, depth of invasion) for local recurrence.
  • Evaluation of preoperative diagnostic tools for risk stratification.

Main Results:

  • T1 rectal cancers with submucosal invasion (sm1) <1,000 μm and good tumor grade are "low risk" with <3.2% nodal involvement.
  • These "low risk" T1 cancers are candidates for local excision as curative treatment.
  • Poor tumor grade necessitates exclusion from local excision.

Conclusions:

  • Careful patient selection based on preoperative risk assessment is crucial for successful local excision.
  • Diagnostic tools like digital exam, endoscopy, and ultrasonography aid in identifying "low risk" or excluding "high risk" factors.
  • The choice of initial treatment modality should consider nodal involvement rates.