Do patients with tuberous sclerosis complex have an increased risk for malignancies?

Area of Science:

• Oncology
• Genetics
• Rare Diseases

Background:

• Tuberous Sclerosis Complex (TSC) is a genetic disorder typically causing benign tumors.
• Malignancies are infrequently reported in TSC patients, necessitating further investigation into cancer risk.

Purpose of the Study:

• To assess the frequency of malignancies in a large Italian TSC cohort.
• To determine if TSC confers an increased cancer risk and identify associated features.
• To compare cancer incidence and age at diagnosis with the general population.

Main Methods:

• Retrospective analysis of 240 Italian TSC patients diagnosed between 2001 and 2015.
• Evaluation of malignancy occurrence, types, age at diagnosis, and patient mutation status (TSC1 vs. TSC2).

Main Results:

• Fifteen TSC patients (6.25%) developed malignancies, with a median age at diagnosis of 37.5 years.
• Renal cell carcinoma was the most common renal tumor; non-renal malignancies showed no specific prevalent type.
• Overall cancer prevalence was comparable to the general population, but the age at diagnosis was significantly lower.
• Malignancies were more frequent in patients with TSC1 mutations compared to TSC2 or no identified mutation (P=0.032).

Conclusions:

• TSC patients do not appear to have an elevated overall risk for malignancies, except possibly for renal cell carcinoma.
• Cancer diagnoses in TSC patients occur at a younger age than in the general population.
• A higher incidence of malignancies was observed in TSC patients with TSC1 mutations, warranting further research.