Malignant melanoma in Connecticut and Denmark

Area of Science:

• Dermatology and Epidemiology
• Cancer Research
• Public Health

Background:

• Malignant melanoma incidence has been increasing worldwide.
• Understanding geographic and demographic variations in melanoma is crucial for public health initiatives.
• Previous studies have suggested links between sun exposure and melanoma development.

Purpose of the Study:

• To analyze trends in malignant melanoma incidence using data from Denmark and Connecticut.
• To investigate variations in melanoma incidence by age, sex, and anatomical site.
• To explore the relationship between sun exposure patterns and melanoma etiology.

Main Methods:

• Analysis of 7,530 malignant melanoma cases from the Danish Cancer Registry (1942-1972) and Connecticut Tumor Registry (1935-1974).
• Age-adjusted incidence rates were calculated and compared between the two registries.
• Birth cohort analysis and site-specific incidence rates (adjusted for surface area and melanocyte density) were examined.

Main Results:

• Overall age-adjusted melanoma incidence rates were similar between Denmark and Connecticut.
• Significant increases in incidence were observed in Danish females and Connecticut males.
• Lower-extremity melanomas rose in Danish women, while trunk-neck melanomas increased in Connecticut men. Facial melanomas showed stable incidence.
• Higher-than-expected rates for facial melanoma (both sexes) and trunk-neck melanoma (males) were noted.

Conclusions:

• Cumulative sun exposure may be a factor in facial melanoma, while intermittent, intense exposure might relate to melanomas in other sun-exposed areas.
• Melanoma in sites other than the face appears to be the primary driver of the overall rising incidence.
• Public health strategies should consider different sun exposure patterns and their association with specific melanoma locations.