Second Primary Cancer After Bladder Cancer: A Comprehensive Analysis of a National Cancer Registry

Area of Science:

• Oncology
• Cancer Epidemiology
• Public Health

Background:

• Bladder cancer (BC) survivors often experience long-term survival.
• Non-urothelial second primary cancers (SPC) are a frequent occurrence in this population.

Purpose of the Study:

• To assess the risk of developing non-urothelial SPC after a primary BC diagnosis.
• To evaluate the mortality risk from SPC in BC survivors.

Main Methods:

• Utilized the Czech National Cancer Registry for data.
• Calculated standardized incidence ratios (SIR) for SPC development.
• Calculated standardized mortality ratios (SMR) for SPC-related death.

Main Results:

• Analyzed 12,645 SPC cases among 61,314 BC survivors.
• BC survivors showed a significantly increased SIR for all cancers (1.75), especially within 5 years.
• Elevated SMR (1.25) for all cancers and identified specific SPCs like lung, laryngeal, colorectal, and thyroid cancers.

Conclusions:

• BC survivors have a substantially higher risk of subsequent primary cancers, particularly in the first five years.
• This elevated risk includes smoking-related cancers and others not typically associated with smoking.
• Highlights the need for vigilant long-term monitoring of BC survivors for secondary malignancies.