Increased Risk of Skin Cancer in 1,851 Long-Term Retinoblastoma Survivors

Area of Science:

• Oncology
• Dermatology
• Genetics

Background:

• Patients with hereditary retinoblastoma have an elevated risk for cutaneous melanoma.
• The incidence of nonmelanoma skin cancer (NMSC) in this population is not well understood.
• The role of sun exposure and other factors in skin cancer development among retinoblastoma survivors is unclear.

Purpose of the Study:

• To investigate the incidence of melanoma and NMSC in a cohort of retinoblastoma survivors.
• To compare skin cancer risk between hereditary and nonhereditary retinoblastoma survivors.
• To determine the age of onset and risk factors for skin cancers in this population.

Main Methods:

• A cohort study of 1,851 White retinoblastoma survivors diagnosed between 1914 and 2006.
• Long-term follow-up through 2016 to track melanoma and NMSC development.
• Analysis of incidence rates, age at diagnosis, and distribution patterns of skin cancers.

Main Results:

• Hereditary survivors had a higher incidence of both melanoma (4.5% vs 0.7%) and NMSC (3.7% vs 1.5%) by age 50 compared to nonhereditary survivors.
• Melanoma and NMSC were diagnosed approximately 20 years earlier in hereditary survivors.
• Skin cancer patterns differed, with NMSC primarily on the head/neck and melanoma more broadly distributed.

Conclusions:

• Hereditary retinoblastoma survivors have a significantly increased risk for developing melanoma and NMSC.
• Genetic factors likely contribute to the earlier onset and increased incidence of skin cancers in this group.
• Recommendations for lifelong skin cancer screening and sun protection starting in early childhood are supported.