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Updated: Jun 16, 2026

A 3D Organotypic Melanoma Spheroid Skin Model
Published on: May 18, 2018
[But...was there ever a Clark classification of melanomas?].
E Sánchez Yus1, M Herrera, R S Simón
1Departamento de Medicina II Dermatología, Facultad de Medicina, Universidad Complutense, Madrid, España. evasyus@hotmail.com
The widely used Clark classification for cutaneous melanoma lacks proven prognostic value. Morphological differences in melanoma are now understood to be related to location, not the tumor itself.
Area of Science:
- Dermatopathology
- Oncology
Context:
- The Clark classification has been a standard for cutaneous melanoma diagnosis for 40 years.
- This system categorizes melanoma based on invasion depth.
Purpose:
- To re-evaluate the prognostic significance of the Clark classification for cutaneous melanoma.
- To investigate the relationship between morphological variations and clinical outcomes.
Summary:
- A critical review of original research indicates the Clark classification's limited validity.
- Morphological differences in cutaneous melanoma do not reliably predict prognosis.
- Tumor localization appears more influential than morphology on outcomes.
Impact:
- Challenges the long-standing use of the Clark classification in clinical practice.
- Suggests a shift in diagnostic focus towards other prognostic factors.
- Highlights the need for updated melanoma classification systems.
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