Multiple primary malignancies in patients with anal squamous cell carcinoma

Area of Science:

• Oncology
• Cancer Epidemiology

Background:

• Previous studies on second primary malignancy (SPM) risk often exclude patients with prior or synchronous cancers.
• A comprehensive understanding of multiple cancer risk in squamous cell carcinoma of the anus (SCCA) patients is needed.

Purpose of the Study:

• To assess the incidence of prior and subsequent primary malignancies in SCCA patients.
• To characterize the outcomes of SCCA patients with multiple primary cancers.

Main Methods:

• Retrospective analysis of 46 patients treated for SCCA between 2006 and 2017.
• Inclusion of patients with previous primary malignancies and those who developed SPMs.

Main Results:

• 39% of SCCA patients had either a prior malignancy (9 patients) or developed an SPM (9 patients).
• Six patients had three or more total malignancies.
• Patients with SPMs were more likely to die from their SPM than from SCCA, unlike those without SPMs who often died from SCCA recurrence.

Conclusions:

• SCCA patients have a significant risk of developing multiple primary malignancies.
• Potential contributing factors include HPV infection, immunosuppression, chemotherapy-induced mutations, and genetic predispositions.
• Lifelong surveillance is recommended for SCCA patients due to their elevated risk of subsequent cancers.