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Related Concept Videos

Mutations01:35

Mutations

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DNA Distortion and Damage
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Minimal Erythema Dose MED Testing
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Vemurafenib skin phototoxicity is indirectly linked to ultraviolet A minimal erythema dose decrease.

C Brugière1, A Stefan, C Morice

  • 1Department of Dermatology, CHU Caen, Caen, F-14000, France; Université Caen Basse-Nomandie, Medical School, Caen, F-14000, France.

The British Journal of Dermatology
|July 29, 2014
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Summary
This summary is machine-generated.

Vemurafenib treatment for melanoma causes UVA photosensitivity in most patients. This reaction is likely due to a vemurafenib metabolite, not the drug itself, impacting treatment adherence.

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Area of Science:

  • Dermatology
  • Pharmacology
  • Oncology

Background:

  • Vemurafenib (BRAF inhibitor) treats metastatic melanoma but causes photosensitivity, often leading to treatment discontinuation.
  • Understanding photosensitivity mechanisms is crucial for managing vemurafenib therapy.

Purpose of the Study:

  • To investigate the mechanisms of photosensitivity in patients receiving vemurafenib for metastatic melanoma.

Main Methods:

  • Prospective study of 12 melanoma patients undergoing vemurafenib treatment.
  • Photobiological assessments including ultraviolet A (UVA) minimal erythema dose (MED) and polychromatic MED.
  • Spectrophotometric analysis of vemurafenib, serum, and faeces before and after treatment.

Main Results:

  • 92% of patients exhibited photosensitivity.
  • UVA MED decreased post-treatment, while polychromatic MED remained normal.
  • Spectrophotometry identified specific peaks related to UVA phototoxicity, suggesting a metabolite's involvement.

Conclusions:

  • Photosensitivity induced by vemurafenib is a UVA phototoxicity reaction.
  • Results suggest a vemurafenib metabolite, rather than the parent drug, is responsible for this phototoxicity.