Familial Risks and Mortality in Second Primary Cancers in Melanoma

Area of Science:

• Oncology
• Cancer Epidemiology
• Genetics

Background:

• Malignant melanoma (MM) patients face an elevated risk of developing second primary cancers (SPCs).
• Family history of cancer is a known risk factor for various malignancies.

Purpose of the Study:

• To assess the mortality and risk of SPCs in MM patients with a familial cancer history.
• To compare SPC risk in MM patients with affected first-degree relatives against the general population.

Main Methods:

• Utilized the Swedish Family-Cancer Database (1958-2015) to analyze relative risks (RRs) and causes of death.
• Identified 35,451 MM patients, with 3,212 diagnosed with SPCs.
• Stratified SPC risk analysis based on concordant family history of cancer in first-degree relatives.

Main Results:

• Familial RRs were significantly increased for second melanoma (RR=19.28), squamous cell skin cancer (RR=7.58), leukemia (RR=5.69), and other cancers including bladder, ovarian, kidney, and breast.
• Overall familial risk for all cancers was elevated (RR=2.09) compared to the general population (RR=1.78).
• Second primary cancers were the primary cause of death in MM patients diagnosed with SPCs.

Conclusions:

• A prior family history of cancer is associated with a higher incidence of SPCs in malignant melanoma patients.
• SPCs significantly contribute to mortality in MM patients, often being the major cause of death.
• Implementing prevention strategies and early detection of SPCs is vital for enhancing survival outcomes in MM patients.