PGx PACLITAXEL

Scientifically reviewed | Last updated July 14, 2025
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CYP2C8

The chemotherapeutic agent paclitaxel is primarily metabolized by the enzyme CYP2C8. Variants in the CYP2C8 gene can lead to reduced enzyme activity and consequently to a slower breakdown of the drug.

 

The CYP2C8*3 allele reduces enzyme activity to as low as 15% of the normal level. Approximately 13% of the Caucasian population are heterozygous, and about 1.7% are homozygous for the CYP2C8*3 allele. In both cases, toxicities may occur during paclitaxel therapy. Determining the CYP2C8 genotype before starting treatment enables the possibility of individual dose adjustment of paclitaxel and helps prevent side effects.

 

References

Rodríguez-Antona 2010, Pharmacogenomics 11:621 / Gréen et al. 2009, Basic Clin Pharmacol Toxicol 104:130 / Spratlin et al. 2007, Crit Rev Onc (Haem 61:222 (2007) / Dai et al. 2001, Pharmacogenetics 11:597

GENES
CYP2C8
HOW CAN YOU GET TESTED?
Step 1: Visit healthcare professional
Step 2: Sample collection (blood or buccal swab)
Step 3: Sequencing performed at our accredited laboratory
Step 4: Medical report
Step 5: Genetic counselling
FAQ

How does pharmacogenomic testing improve therapy with anticancer drugs?

Can I order tests to assess the toxicity risk of cancer therapies other than paclitaxel?

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