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- W2804675995 abstract "Abstract Background Folate level was proposed to be a predictor for fluoropyrimidine-related toxicity. We conducted a prospective study to determine the association between serum and red-cell folate and capecitabine-related toxicity in patients with colorectal cancers. Materials and Methods Eligibility criteria included diagnosis of colorectal cancers; eligible patients who were scheduled to undergo capecitabine monotherapy or capecitabine-oxaliplatin (CAPOX) for adjuvant or palliative purposes. Exclusion criteria included concomitant radiotherapy or chemotherapy other than capecitabine or CAPOX and creatinine clearance <30 mL/min. Fasting serum and red-cell folate were measured prior to chemotherapy. Capecitabine was administered at 2,500 mg/m2 per day (monotherapy) or 2,000 mg/m2 per day (CAPOX) for 14 days every 3 weeks. The toxicity of the first four cycles was documented by clinical investigators who were blinded to folate levels. Results A total of 144 patients were recruited, of whom 126 were eligible; 40 patients had capecitabine alone, and 86 patients received CAPOX. The rates of grade 2 and grade 3 toxicity were 63.5% and 14.3%, respectively. Nausea and vomiting were the most common grade ≥2 adverse event (47.7%), followed by hand-foot syndrome (25.4%), diarrhea (23.1%), and neutropenia (22.3%). Combination with oxaliplatin (odds ratio [OR], 2.77; p = .043) and serum folate (OR, 10.33; p = .002) were independent predictors of grade ≥2 toxicity. Red-cell folate was not predictive of toxicity. For every 10 nmol/L increment in serum folate, the risk of grade ≥2 toxicity increased by 9%. Conclusion Serum folate level, but not red-cell folate, was associated with higher rate of grade ≥2 toxicity during capecitabine-based treatment. Excessive folate intake may be avoided before and during capecitabine-based chemotherapy. Implications for Practice This is the first prospective study to evaluate the association between serum folate level and capecitabine-related toxicity in patients with colon cancers. It shows that higher serum folate level is associated with increased risks of moderate to severe toxicity during capecitabine-based treatment. Excessive folate intake should be avoided before and during capecitabine-based chemotherapy." @default.
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- W2804675995 date "2018-05-25" @default.
- W2804675995 modified "2023-10-18" @default.
- W2804675995 title "Association Between Serum Folate Level and Toxicity of Capecitabine During Treatment for Colorectal Cancer" @default.
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- W2804675995 doi "https://doi.org/10.1634/theoncologist.2017-0637" @default.
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