What is the epidemiology of skin cancer, including incidence, subtypes, and mortality, in Black individuals?

Epidemiology of Skin Cancer in Black Individuals

Melanoma is approximately 30 times less common in Black individuals compared to White individuals, but Black patients are diagnosed at later stages with significantly worse survival outcomes, particularly for acral lentiginous melanoma which is the predominant subtype in this population 1.

Incidence and Prevalence

Overall Incidence

• Melanoma incidence is dramatically lower in Black individuals compared to White populations (approximately 30-fold difference) 1
• Despite lower overall incidence, Black individuals experience 9% lower cancer incidence overall but 10% higher mortality for skin cancers 2

Predominant Subtypes

Melanoma:

• Acral lentiginous melanoma (ALM) is the most common melanoma subtype in Black populations 1, 3
• ALM occurs on non-sun-exposed areas: palms, soles, fingernails, and toenails 1, 3
• Lower extremity melanomas are most common presentation site (56.1% in Black patients vs 34.5% trunk lesions in White patients) 4

Non-Melanoma Skin Cancer (NMSC):

• Squamous cell carcinoma (SCC) is the most common skin cancer in Black individuals, not basal cell carcinoma as seen in White populations 5
• SCC tends to occur on non-sun-exposed, covered areas in Black patients 5
• Basal cell carcinoma, when present, more commonly involves head and neck regions 6

Mortality and Survival Disparities

Critical Mortality Gap

Black individuals have two-fold higher death rates for several skin cancers despite lower incidence 2:

• Melanoma mortality is significantly elevated in Black males (relative risk 1.16 for 50% increase in UVB exposure) 7
• Cancer-specific mortality is significantly higher for nodular melanoma (NM) and acral lentiginous (AL) subtypes in Black patients 4
• 5-year cancer-specific survival is significantly lower among Black individuals for NM and AL melanomas 4

Stage at Diagnosis

Black patients present with more advanced disease 3, 4:

• Deeper tumor invasion (greater Breslow thickness)
• Higher rates of ulceration
• Increased lymph node positivity
• More advanced stage at presentation

This later-stage diagnosis is the primary driver of worse outcomes, not biological differences in tumor behavior 3, 6, 4.

Risk Factors and Etiology

Unique Risk Profile

UV radiation appears less important as an etiologic factor in Black individuals 5:

• Most lesions occur on covered, non-sun-exposed areas
• The protective effect of melanin reduces UV-related damage
• Alternative risk factors predominate: chronic inflammation, burns, trauma, and scarring 5

Age and Gender Patterns

• Peak incidence occurs in the sixth and seventh decades of life 4
• Male gender independently associated with increased mortality in multivariate analysis 4

Contributing Factors to Disparities

Systemic and Structural Barriers

The worse outcomes reflect systemic inequities rather than biological differences 1, 3:

Healthcare Access Issues:

• Delayed diagnosis due to lower index of suspicion among both patients and providers 6
• Reduced access to dermatologic care 3
• Inequities in treatment access 3

Detection Challenges:

• Atypical presentations not recognized early 6
• Lower awareness in both medical community and Black populations 6
• Traditional screening methods (ABCDE rule) less effective for acral melanomas 6

Structural Racism:

• Policies and practices in healthcare delivery perpetuate inequities 1
• These factors trace back to social determinants of health 2

Clinical Implications

High-Risk Features in Black Patients

When evaluating Black patients, specifically examine:

• Acral sites: palms, soles, nail beds (most common melanoma locations) 1, 3, 6
• Areas of chronic trauma or scarring (SCC risk) 5
• Any changing lesions on non-sun-exposed skin 5, 6

Common Pitfalls to Avoid

• Do not assume low risk based on skin tone alone - absolute risk is lower but outcomes are worse 3, 2
• Do not rely solely on sun exposure history for risk stratification 5
• Do not overlook acral sites during skin examinations 1, 3
• Do not delay biopsy of suspicious lesions due to atypical appearance 6

Screening Considerations

The USPSTF concludes insufficient evidence exists for routine visual skin examination screening in all populations, including Black individuals 1. However, given the later-stage presentation and worse mortality, maintaining high clinical suspicion and low threshold for biopsy of concerning lesions is critical 3, 6, 4.

Future Directions

Targeted interventions needed 3, 2:

• Enhanced melanoma education for Black patients and healthcare providers
• Improved access to dermatologic care
• Earlier detection strategies specific to acral melanoma
• Addressing social determinants of health
• Increasing diversity in clinical trials

The persistent racial inequities in melanoma diagnosis, access to care, and treatment represent a critical public health challenge requiring multifaceted systemic solutions 3, 2.