When did the incidence of skin cancer begin to rise, and was this increase associated with the introduction of modern sunscreen?

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Skin Cancer Incidence Trends and the Sunscreen Hypothesis

No, the claim that skin cancer increased because of sunscreen invention is not supported by evidence—melanoma incidence began rising sharply from 1973 onward due to increased UV exposure and possibly earlier detection, not because sunscreen caused cancer. 1

When Did Skin Cancer Cases Increase?

Melanoma incidence more than doubled between 1973 and 1998, rising from 5.7 cases per 100,000 persons to 14.3 per 100,000 persons in the United States. 1 This represents a greater than 100% increase over 25 years, with melanoma continuing to rise while most other cancers were decreasing during this period. 1, 2

  • Mortality also increased by approximately 44% during this same timeframe, from 1.6 to 2.3 deaths per 100,000 persons, though mortality rates stabilized during the 1990s, particularly among women. 1

  • Non-melanoma skin cancers (basal cell and squamous cell carcinomas) also showed major increases from 1973 through 1987, with the greatest increases occurring on sun-exposed areas like the head and neck. 3

The Sunscreen Hypothesis: What Does the Evidence Show?

The relationship between sunscreen use and melanoma has been controversial, but the evidence does not support that sunscreen causes skin cancer. Here's what actually happened:

Early Confusing Associations

  • Studies before the 1980s showed a positive association between melanoma and sunscreen use (cumulative OR: 2.35; 95% CI: 1.66-3.33), which led to the hypothesis that sunscreen might increase melanoma risk. 4

  • This association has constantly decreased since the early 1980s and was no longer statistically significant from the early 1990s onward. 4

Why the Early Studies Were Misleading

Five key confounding factors explain the apparent paradox:

  1. Reverse causation: Fair-skinned individuals at highest risk for melanoma were more likely to use sunscreen, creating a spurious association. 4

  2. Early sunscreens only blocked UVB radiation (which causes sunburn) but were "virtually transparent to UVA," which makes up 90-95% of UV energy and contributes to melanoma development. 5 This allowed users to stay in the sun longer without burning while still accumulating cancer-causing UV exposure.

  3. Increased sun exposure duration: Because sunscreens prevented erythema and sunburn, users may have permitted excessive exposure to portions of the solar spectrum other than UVB. 5

  4. Increased awareness and reporting: Better detection methods and heightened awareness led to more diagnoses, particularly of early-stage melanomas. 1, 2

  5. Inadequate application: Users commonly applied insufficient quantities of sunscreen or failed to reapply after water exposure or sweating, providing inadequate protection. 1

Current Evidence on Sunscreen Effectiveness

Modern meta-analyses show no increased risk of skin cancer from sunscreen use, though they also don't confirm strong protective benefits for melanoma:

  • A 2018 systematic review of 29 studies (313,717 participants) found no significant association between skin cancer and sunscreen use (OR = 1.08; 95% CI: 0.91-1.28). 4

  • Daily sunscreen use reduced squamous cell carcinoma incidence in a randomized trial (RR: 0.61; 95% CI: 0.46-0.81), though it had no effect on basal cell cancer. 2

  • No direct data exist on sunscreen's effect on melanoma incidence, and the protective benefits remain unconfirmed in the general population. 2, 4

The Real Causes of Rising Skin Cancer Rates

The rapid increase in melanoma incidence is primarily attributed to:

  • Increased exposure to UV radiation from changing patterns of recreational sun exposure, including sunbathing and tanning habits that became popular in the early to mid-1900s. 1, 2

  • Cultural shifts toward tanning: By the late 1970s, tanned skin became associated with better health and attractiveness, leading to increased intentional sun exposure. 1

  • Use of tanning beds and sunlamps, particularly among adolescents, which became an important risk factor. 6

  • Earlier detection of melanoma through improved screening and awareness, contributing to rising incidence rates without necessarily reflecting increased disease occurrence. 1, 2

  • Approximately 65-90% of melanomas are caused by UV exposure, with severe, blistering sunburns in childhood and adolescence particularly associated with increased risk. 1

Critical Caveats

The timing doesn't support the sunscreen hypothesis: Modern sunscreens with high SPF became widely used in the 1970s-1980s, 5 which coincides with when melanoma rates were already rising sharply from 1973 onward. 1 The increase began before widespread sunscreen adoption, not after.

Broad-spectrum protection matters: Modern sunscreens that block both UVA and UVB radiation may be more effective than early formulations that only blocked UVB. 2

References

1
Guideline

guidelines for school programs to prevent skin cancer.

MMWR Recommendations and Reports, 2002

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