Trends in Invasive Melanoma Thickness in Norway, 1983–2019

Authors

DOI:

https://doi.org/10.2340/actadv.v104.26110

Keywords:

incidence study, melanoma, tumour thickness, trends, demographic factors

Abstract

Monitoring melanoma incidence time trends by tumour thickness is essential to understanding the evolution of melanoma occurrence and guiding prevention strategies. To assess long-term incidence trends, tumour thickness was extracted from pathology reports in the Cancer Registry of Norway (1983–2007) and the Norwegian Melanoma Registry (2008–2019), n = 45,635 patients. Across all anatomic sites, T1 (≤ 1 mm) incidence increased most (men annual percentage change [AAPC] = 4.6, 95% confidence interval [95% CI] 4.2–5.0; women AAPC = 3.2, 95% CI 2.8–3.6); the increase was steep until 1989/90, followed by a plateau, and a further steep increase from 2004/05. Increased incidence was also observed for T2 (>1.0–2.0) melanoma (men AAPC = 2.8, 95% CI 2.4–3.2; women AAPC = 1.5, 95% CI 1.1–1.9), and T3 (>2.0–4.0) in men (AAPC = 1.4, 95% CI 0.9–1.9). T4 (>4.0) melanoma followed a similar overall pattern (men AAPC = 1.3, 95% CI 0.9–1.7, head/neck, upper limbs, and trunk; women AAPC = 0.9, 95% CI 0.4–1.4, upper limbs and trunk). Men had the highest T3 and T4 incidence and the sex difference increased with age. Regarding birth cohorts, age-specific incidence increased in all T categories in the oldest age groups, while stabilizing in younger patients born after 1950. Overall, the steep increase in T1 melanoma was not accompanied by a decrease in thick melanoma.

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Author Biographies

Raju Rimal, Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway

Postdoctoral Fellow

Affiliations

Oslo Centre for Biostatistics and Epidemiology (OCBE)
EpiStat: Epidemiological Studies of Lifestyle and Chronic Diseases

Trude E. Robsahm, Department of Research, Cancer Registry of Norway, Norwegian Institute of Public Health, Oslo, Norway

Researcher and Head of section

Department: Research Department Section: Section for epidemiology and prevention

Adele C. Green, Department of Population Health, QIMR Berghofer Medical Research Institute, Brisbane, Australia; Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom

Senior Scientist, Cancer and Populations Studies, QIMR Berghofer

Other Affiliation:

Department of Population Health, QIMR Berghofer Medical Research Institute, Brisbane, Australia

Cancer Research UK Manchester Institute, University of Manchester, Manchester, United Kingdom

 

Bjørn Møller, Department of Registration, Cancer Registry of Norway, Oslo, Norway

Head of Department of Registration

Marit B. Veierød, Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo

Affiliations
Department of Biostatistics/Oslo Centre for Biostatistics and Epidemiology
Department of Nutrition

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Published

2024-09-02

How to Cite

Rimal, R., Robsahm, T. E., Green, A. C., Ghiasvand, R., Rueegg, C. S., Bassarova, A., … Veierød, M. B. (2024). Trends in Invasive Melanoma Thickness in Norway, 1983–2019. Acta Dermato-Venereologica, 104, adv26110. https://doi.org/10.2340/actadv.v104.26110

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