Management of endoscopically removed malignant colon polyps

Area of Science:

• Gastroenterology
• Surgical Oncology
• Pathology

Background:

• Colorectal polyps are common, and malignant transformation necessitates treatment.
• Endoscopic polypectomy is a primary method for removing colorectal polyps.
• Determining the adequacy of polypectomy for malignant polyps is crucial.

Observation:

• A retrospective review of 89 malignant colorectal polyps from 87 patients treated between 1971 and 1983.
• 55 polyps had carcinoma-in-situ, 4 had pseudo-invasion, and 30 had invasive carcinoma.
• No residual or metastatic disease was observed in patients with carcinoma-in-situ or pseudo-invasion.

Findings:

• Polypectomy alone was adequate for all carcinoma-in-situ and pseudo-invasion cases.
• 14% of invasive carcinoma cases required further treatment beyond polypectomy.
• Histologic criteria including resection margin involvement, lymphatic invasion, and poor differentiation predicted residual or recurrent disease.

Implications:

• Endoscopic polypectomy is sufficient treatment for colorectal polyps with carcinoma-in-situ.
• Most invasive colorectal cancers treated with polypectomy are cured.
• Colectomy is recommended for invasive polyps with specific high-risk features: margin involvement, lymphatic invasion, or poorly differentiated histology.