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Related Concept Videos

Mutagenicity and Carcinogenicity01:25

Mutagenicity and Carcinogenicity

Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...

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Related Experiment Video

Updated: Jul 6, 2026

An In Vitro Approach to Photodynamic Therapy
04:53

An In Vitro Approach to Photodynamic Therapy

Published on: August 17, 2018

Standardized protocols for photocarcinogenesis safety testing.

P Donald Forbes1, Janusz Z Beer, Homer S Black

  • 1Argus Research, Charles River Laboratories, Inc. Horsham, PA 19044, USA. forbes@toxarus.com

Frontiers in Bioscience : a Journal and Virtual Library
|April 18, 2003
PubMed
Summary
This summary is machine-generated.

Solar ultraviolet radiation (UVR) is a primary cause of skin cancer. New study designs can now assess if agents enhance UVR-induced skin tumor formation, aiding drug safety evaluations.

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In Vitro and In Vivo Evaluation of Photocontrolled Biologically Active Compounds - Potential Drug Candidates for Cancer Photopharmacology

Published on: September 29, 2023

Area of Science:

  • Photobiology
  • Dermatology
  • Toxicology

Background:

  • Solar ultraviolet radiation (UVR) is a known carcinogen, particularly for non-melanoma skin cancer.
  • Exposure to photosensitizing agents and certain other drugs, like immunosuppressants, increases skin cancer risk.
  • Regulatory agencies worldwide are evaluating methods to assess photocarcinogenesis risk for drugs and chemicals.

Purpose of the Study:

  • To review the current understanding of UVR-induced skin cancer and factors that enhance it.
  • To highlight the need for validated methods to assess photocarcinogenesis risk.
  • To introduce published protocols for evaluating agents that may enhance UVR-induced skin tumors.

Main Methods:

  • Review of existing literature on UVR carcinogenesis and photosensitization.
  • Discussion of regulatory requirements for photocarcinogenesis assessment by agencies like the U.S. FDA and Health Canada.
  • Description of newly published study designs for evaluating photocarcinogenic potential.

Main Results:

  • Skin cancer incidence correlates with UVR exposure and is increased by photosensitizers and immunosuppressants.
  • Current short-term tests lack validation as predictors of photocarcinogenic enhancement.
  • New protocols offer a means to determine if agents enhance UVR-induced skin tumor development.

Conclusions:

  • Validated methods are crucial for assessing the photocarcinogenic risk of drugs and chemicals.
  • Published study designs provide a pathway for evaluating agents that may enhance UVR-induced skin cancer.
  • Regulatory bodies are increasingly focused on the photocarcinogenesis potential of pharmaceutical products.