Treatment of Colon Cancer Arising in a Pedunculated or Sessile Polyp (Adenoma) with Invasive Cancer (pT1)
This protocol addresses a specific and clinically important situation: a colonic polyp — either pedunculated or sessile in morphology — in which cancer has been found to invade the submucosa, qualifying it as a malignant polyp at pathological stage pT1.
Clinical Scenario
A malignant polyp is defined as one in which cancer invades through the muscularis mucosa and into the submucosa (pT1). Confirming the presence of invasive cancer is the first essential step. Key pathologic factors — including margin status, completeness of resection, and histologic features of the specimen — determine how the case is managed.
Treatment Approach
Depending on the histologic characteristics and margin assessment of the resected specimen, management may range from observation alone to a surgical intervention involving colectomy.
Full decision criteria and the complete structured regimen are available via the link below.
References
- Pedunculated or sessile polyp (adenoma) with invasive cancer.
- Confirm the presence of invasive cancer (pT1).
- A malignant polyp is defined as one with cancer invading through the muscularis mucosa and into the submucosa (pT1).
- Single specimen, completely removed with favorable histologic features and clear margins.
- In patients with invasive cancer in a pedunculated or sessile polyp (adenoma), no additional surgery is required if the polyp has been completely resected and has favorable histologic features.
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