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Related Experiment Videos

Thick malignant melanoma is a long-term problem.

P R Asquith1, J M Barnett, B K Lockett

  • 1General Surgery, Palmerston North Hospital.

The New Zealand Medical Journal
|September 24, 1999
PubMed
Summary
This summary is machine-generated.

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Melanoma incidence is rising, with both thin and thick melanomas increasing. Early detection and removal of thin melanomas may reduce future thick melanoma cases, though this effect may take decades.

Area of Science:

  • Dermatology
  • Oncology
  • Epidemiology

Background:

  • Melanoma incidence rates have been increasing globally.
  • Understanding trends in melanoma depth and patient age is crucial for public health strategies.

Purpose of the Study:

  • To analyze changes in the incidence of in-situ, thin (<0.76 mm), and thick (>0.76 mm) melanoma.
  • To investigate the relationship between melanoma thickness and patient age at diagnosis.

Main Methods:

  • Retrospective case series of melanoma diagnoses from Palmerston North pathology records (1983-1994).
  • Denominator population estimated using census data from 1986 and 1991.
  • Poisson regression analysis used to determine incidence rate changes.

Main Results:

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  • Annual increases in diagnostic rates for in-situ (16%) and invasive (5%) melanomas observed (p < 0.0001).
  • No significant difference in the rate of increase between thin and thick invasive melanomas.
  • Mean age at diagnosis differed significantly between thin (49.0 years) and thick (55.4 years) melanomas (p < 0.0001).

Conclusions:

  • Evidence suggests progression from thin to thick melanoma over time (6-30 years).
  • Increasing incidence of poor-prognosis thick melanomas is a concern.
  • Sustained removal of thin melanomas may lead to a future decline in thick melanomas, but this is expected to take decades.