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Pharmacogenetics of Capecitabine-based treatment in advanced breast cancer patients

Genes  for  which  polymorphisms  may  potentially influence  inter-individual  pharmacodynamics  variation of  fluoropyrimidines,  including  capecitabine,  are  the methylenetetrahydrofolate reductase (MTHFR) and  the dihydropyrimidine dehydrogenase (DPYD).

The C677T and A1298C MTHFR polymorphisms may modulate  the  cytotoxic  effect  of  5-fluorouracil  (5-FU), commonly  used  chemotherapeutic  agents  for  breast cancer, because the modes of action of 5FU is critically dependent on cellular composition of folates.

The C677T and A1298C MTHFR polymorphisms are associated  with  reduced  activity  of  MTHFR  enzyme, resulting  in  increased  levels  of  homocysteine  and abnormal intracellular distribution of folates.


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