The Meals and Drug Administration (FDA) has up to date the labeling for Xeloda (capecitabine) and fluorouracil (5-FU) to emphasise the dangers related to dihydropyrimidine dehydrogenase (DPD) deficiency.
Within the replace, the regulatory company shares that sufferers with full or partial DPD deficiency face an elevated threat of extreme and probably deadly toxicities, together with mucositis, diarrhea, neutropenia and neurotoxicity. The FDA advises oncologists and healthcare suppliers to tell sufferers of those dangers and take into account genetic testing for DPD deficiency earlier than initiating remedy.
In an interview with CURE, Dr. Gabriel A. Brooks, an affiliate professor of medication and an affiliate professor at The Dartmouth Institute, Dartmouth Most cancers Middle, The Dartmouth Institute for Well being Coverage and Scientific Observe, explains what DPD deficiency is and why it will be important for sufferers receiving 5-FU or Xeloda to concentrate on it. He goes on to point out how sufferers can discover out if they’ve DPD deficiency earlier than beginning remedy with fluorouracil or Xeloda.
Glossary:
Dihydropyrimidine dehydrogenase (DPD): an enzyme that breaks down fluoropyrimidines, equivalent to 5-FU and Xeloda.
Brooks can also be a member of the Most cancers Inhabitants Sciences Analysis Program, and a member of the Gastrointestinal Scientific Oncology Group, at Dartmouth Geisel College of Drugs, in Lebanon, New Hampshire.
Transcript:
DPD is the abbreviation for the enzyme that metabolizes 5-FU and Xeloda. How each of these medication are damaged down by the physique is regulated by that enzyme, and deficiency of that enzyme signifies that the enzyme that your physique has, does not work in a completely lively or totally regular manner. You probably have DPD deficiency, it may result in elevated unintended effects from the chemotherapy.
The easiest way to find out in case you have DPD deficiency is to do a gene take a look at that may be achieved on a easy blood draw. I routinely try this take a look at for all of my sufferers who’re going to get 5-FU or Xeloda chemotherapy. That blood take a look at can take a couple of week — typically a bit of extra — to show round.
It is very important take into consideration this forward of time, so that when the plan is made to do chemotherapy remedy with 5-FU or Xeloda, as quickly as the choice is made, [you can send for a test]. That is the time to ship this take a look at in order that it does not delay the beginning of chemotherapy. It is best to have the outcomes again earlier than beginning chemotherapy, as a result of in case you have a major DPD deficiency that impacts the dosing of the chemotherapy, you need to know that earlier than the primary dose, ideally.
Transcript has been edited for readability and conciseness.
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