Who Will Have a Second Melanoma? A Prospective Longitudinal Study in Patients without Any Genetic Predisposition

Area of Science:

• Dermatology
• Oncology
• Epidemiology

Background:

• Melanoma survivors face an elevated risk of subsequent primary melanomas.
• Predisposing factors for a second primary melanoma, particularly in genetically non-predisposed individuals, require further elucidation.

Purpose of the Study:

• To identify key risk factors associated with the development of a second primary melanoma.
• To guide clinical follow-up strategies for melanoma patients at higher risk.

Main Methods:

• A longitudinal study was conducted using follow-up data from 1523 melanoma patients diagnosed between 1998 and 2020.
• Data analysis included median follow-up of 82 months to assess the incidence of second primary melanomas.

Main Results:

• 3.8% of patients (58/1523) developed a second melanoma, with 19% diagnosed over 10 years post-initial diagnosis.
• Independent risk factors identified include fair skin phototype I-II (OR=5.41) and having over 50 melanocytic nevi (OR=3.44).
• Recurrent sunburns were also associated with increased risk, though not an independent factor in multivariate analysis.

Conclusions:

• Fair skin phototype and a high number of melanocytic nevi (≥50) are significant independent risk factors for developing a second primary melanoma.
• Lifelong, close monitoring is crucial for these high-risk patients to facilitate early detection of additional melanomas.