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Spectrum of morphologic alterations of regression in cutaneous melanoma--potential for improving disease prognosis

Sabina Zurac1, Gabriela Negroiu, Stefana Petrescu

  • 1"Colentina" University Hospital, Dept. of Pathology, Bucharest, Romania. sabina_zurac@yahoo.com

Romanian Journal of Internal Medicine = Revue Roumaine De Medecine Interne
|January 19, 2013
PubMed
Abstract

Insights

Melanoma regression, a complex interplay of tumor cells and immunity, shows varied prognostic significance. Segmentary regression (SR) in thin melanomas appears more favorable than partial regression (PR).

Area of Science:

  • Dermatopathology
  • Oncology
  • Immunology

Background:

  • Melanoma regression involves intricate interactions between tumor cells and the host immune response.
  • The precise biological mechanisms and prognostic implications of melanoma regression remain incompletely understood.
  • Understanding regression is crucial for developing effective anti-cancer vaccine strategies.

Purpose of the Study:

  • To analyze histopathological features of melanoma regression.
  • To compare different types of regression: segmentary (SR), partial (PR), and segmentary & partial (SR-PR), versus no regression (AR).
  • To investigate the prognostic significance of regression subtypes in melanoma.

Main Methods:

  • Analysis of 127 superficial spreading melanomas.
  • Classification of melanomas into SR, PR, SR-PR, or AR groups.
  • Registration of histopathological parameters and statistical analysis (P < 0.05).

Main Results:

  • Regression was observed in 52% of cases, less frequently in pT4 melanomas.
  • SR and SR-PR melanomas exhibited significantly higher tumor-infiltrating lymphocytes compared to AR melanomas.
  • SR melanomas showed fewer mitoses and higher vascular hyperplasia than other regression types and AR.

Conclusions:

  • Different regression patterns may represent distinct processes involving inflammation and tumor destruction.
  • Segmentary regression (SR) appears to have a more favorable prognosis, particularly in thin melanomas.
  • Further research is needed to fully elucidate the mechanisms underlying melanoma regression.

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