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- Presentation
Contributions of a Giant in the Field: The Clinical-Pathological Classification of Cutaneous Melanoma in the Molecular Era
Description
In this talk, the speaker reflects on the historical contributions of Dr. Martin Mim to the clinical-pathological classification of cutaneous melanoma as well as the evolution of melanoma classification methods over the years. The speaker begins by honoring Dr. Mim, a key figure in dermatology who passed away in 2022, and shares insights from their experiences working together. The discussion covers the foundational work of Dr. Mim and Dr. Clark in the 1960s, particularly their classification of melanoma based on clinical and pathological correlations, which helped predict melanoma behavior in different types of sun-exposed skin. The speaker elaborates on the evolution of terminologies and concepts such as radial growth phase and vertical growth phase, which were crucial in understanding melanoma morphology. Through various examples, including superficial spreading melanoma and lentigo maligna, the talk illustrates the complexity of melanoma types and the importance of comprehensive evaluation beyond initial biopsies to determine the biological nature of lesions. The speaker also highlights the significance of advancements in understanding mutations that contribute to melanoma progression, emphasizing how these insights have refined prognostic assessments over time. Dr. Mim's legacy is underscored through anecdotes about his impactful career, his innovative contributions, and his mentorship to many in the field. The speaker concludes with a commitment to continue Dr. Mim's work at Brigham Dermatology while appreciating the historical context of melanoma research.
View moreConclusions
- The classification of melanoma has evolved significantly, reflecting advances in our understanding of the disease and its molecular basis.
- Two main forms of melanoma, superficial spreading melanoma and lentigo maligno melanoma, have distinct biological behaviors and arise in different sun-exposed conditions.
- The concept of radial and vertical growth phases is crucial in understanding melanoma progression, with different phases corresponding to tumorigenic potential.
- Microinvasive melanoma is typically biologically indolent and does not show metastasis in the long term.
- Current understanding indicates that the original Clark progression model applies to only a subset of melanoma types, with multiple mutation pathways leading to metastatic lesions.
- Thorough evaluation of melanoma cases requires comprehensive histopathological examination, as initial diagnoses based solely on biopsies may overlook critical features.
- The presence of dermal mitosis in melanoma can indicate metastatic potential, even in thin lesions.
- Acral lentiginous melanoma and nodular melanoma represent unique categories that deviate from traditional classifications and require tailored diagnostic approaches.
- Guerry D et al. J Invest Dermatol 100: 342S-345S, 1993
- Clark WH Jr., From L, Bernardino EA, Mihm MC Jr. The histogenesis and biologic behavior of primary human malignant melanomas of the Skin. Cancer Res 1969; 29: 705.
- Clark WH Jr., Mihm MC Jr. Lentigo maligna and lentigo-maligna melanoma. Am J Pathol 1969: 55: 39.
- Mihm MC Jr., Clark WH Jr., From L. The clinical diagnosis, classification and histogenetic concepts of the early stages of cutaneous malignant melanomas. N Engl J Med 1971; 284:1078.
- Mihm MC Jr., Fitzpatrick TB, Brown MM, Raker JW, Malt RA, Kaiser JS. Early detection of primary cutaneous malignant melanoma. A color atlas. N Engl J Med 1973;289:989.
- Arrington John H et al. Plantar lentiginous melanoma: A distinctive variant of human cutaneous malignant melanoma. Am J Pathol 1977; Volume 1 Number 2.
- Mihm MC Jr., Fitzpatrick TB, Brown MM, Raker JW, Malt RA, Kaiser JS. Early detection of primary cutaneous malignant melanoma. A color atlas. N Engl J Med 1973;289:989.