Perianal mucinous adenocarcinoma

Area of Science:

• Gastroenterology
• Oncology
• Surgical Pathology

Background:

• Perianal mucinous adenocarcinoma is a rare anal canal epithelioid tumor variant.
• This study examines clinical features, pathology, treatment, and outcomes for this rare cancer.

Purpose of the Study:

• To investigate the clinical characteristics, pathological findings, treatment strategies, and patient outcomes for perianal mucinous adenocarcinoma.
• To understand the prognostic factors and potential therapeutic improvements for this rare malignancy.

Main Methods:

• Retrospective review of medical records for four patients with histologically confirmed perianal mucinous adenocarcinoma.
• Analysis of patient data including presentation, therapy administered, and treatment outcomes.

Main Results:

• All patients presented with pain and bleeding; three had co-existing chronic perirectal disease (abscesses, fistula).
• All cases showed extensive local disease at diagnosis, with one patient having inguinal nodal metastases.
• Treatment included neoadjuvant chemoradiation and/or radiation, followed by surgery in some cases. Three patients died from disease progression or recurrence within 2-48 months; one patient remains disease-free at 12 months post-treatment.

Conclusions:

• Perianal mucinous adenocarcinoma is a rare and aggressive cancer with a generally poor prognosis, often diagnosed at advanced stages.
• Combined chemoradiation followed by surgical resection may improve outcomes for select patients with this rare anal cancer.