• The National Comprehensive Cancer Network (NCCN) has updated its clinical guidelines to recommend considering DPYD genotyping before initiating fluoropyrimidine-based chemotherapy for cancer patients.
• Approximately 6% of individuals carry pathogenic DPYD variants, which can cause severe or fatal toxicity to common chemotherapy drugs like 5-fluorouracil (5-FU) and capecitabine used in treating colon, rectal, and gastrointestinal cancers.
• Clinical data shows that genotype-guided dosing significantly reduces severe toxicity from 73% to 28% in DPYD variant carriers while maintaining treatment effectiveness, representing a major advancement in personalized cancer care.