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Related Concept Videos

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Skin cancer is a type of cancer that occurs when there is an abnormal growth of skin cells, usually triggered by damage to the DNA within the skin cells. It is primarily caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. Skin cancer is the most common type of cancer worldwide, and its incidence continues to rise.
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Related Experiment Video

Updated: Mar 12, 2026

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
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p15 Expression Differentiates Nevus from Melanoma.

Laura A Taylor1, Conor O'Day2, Tzvete Dentchev2

  • 1Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.

The American Journal of Pathology
|November 19, 2016
PubMed
Summary
This summary is machine-generated.

Decreased expression of p15, a key protein in cell growth control, is a strong indicator differentiating benign nevi from malignant melanoma. This finding aids in melanoma diagnosis.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Dermatopathology

Background:

  • BRAF(V600E) mutations drive melanoma but cause growth arrest in nevi.
  • While p16 is linked to melanoma, p15 is identified as a primary effector of oncogene-induced senescence in nevomelanocytes, diminishing in melanomas.

Purpose of the Study:

  • To investigate if reduced p15 protein levels serve as a reliable biomarker for the progression from nevus to melanoma.
  • To compare the diagnostic utility of p15 and p16 expression in distinguishing nevi from melanomas.

Main Methods:

  • Immunohistochemistry (IHC) for p15 and p16 on nevus and melanoma samples, with staining graded by H score.
  • Quantitative real-time RT-PCR to measure p15 mRNA levels in macrodissected FFPE samples from 14 cases.
  • Statistical analysis using two-sided t-tests to compare mean H scores and qΔCt values between groups.

Main Results:

  • p15 expression was significantly higher in melanocytic nevi (mean H score 254.8) than in melanomas (132.3; P < 0.001).
  • The difference in H scores for p15 was more pronounced than for p16 (122.5 vs 64.8).
  • Real-time quantitative RT-PCR confirmed lower p15 expression in melanomas (lower mean qΔCt value; P = 0.018).

Conclusions:

  • Diminished p15 expression is a robust biomarker for distinguishing nevus from melanoma.
  • p15 serves as a more effective diagnostic marker than p16 in this context.
  • These findings highlight the role of p15 in melanoma development and diagnosis.