Individualization of tamoxifen treatment for breast carcinoma

Clin Pharmacol Ther. 2012 Oct;92(4):431-3. doi: 10.1038/clpt.2012.94. Epub 2012 Aug 22.


Traditionally, all patients treated with tamoxifen receive a standard dose. A number of studies claimed a clinically relevant impact of cytochrome P450 2D6 (CYP2D6) genotype on outcome, and therefore genotyping before tamoxifen therapy was advocated. Recent data showed that adequate exposure to the active metabolite endoxifen is important and that genotype only partially explains interindividual differences in endoxifen concentrations. Phenotyping approaches, as well as therapeutic drug monitoring (TDM) strategies, are now being tested to individualize tamoxifen treatment.

Publication types

  • Review

MeSH terms

  • Antineoplastic Agents, Hormonal / administration & dosage*
  • Antineoplastic Agents, Hormonal / metabolism
  • Breast Neoplasms / drug therapy*
  • Breast Neoplasms / genetics
  • Breast Neoplasms / metabolism
  • Cytochrome P-450 CYP2D6 / genetics
  • Cytochrome P-450 CYP2D6 / metabolism
  • Female
  • Humans
  • Precision Medicine / methods*
  • Tamoxifen / administration & dosage*
  • Tamoxifen / metabolism
  • Treatment Outcome


  • Antineoplastic Agents, Hormonal
  • Tamoxifen
  • Cytochrome P-450 CYP2D6