Patients with colorectal cancer (CRC) benefit from increased response rates and overall survival when 5-fluorouracil (5-FU) is combined with folinic acid (FA), though the ideal FA dosage remains uncertain.
A study analyzed tissue samples from 86 CRC patients to assess reduced folate levels after FA was given at doses of 20, 200, and 500 mg/m² before surgery.
Results showed that higher FA doses led to significant increases in reduced folate levels in both normal and tumor tissues, suggesting that administering high doses of FA is optimal for enhancing the effects of 5-FU in mCRC patients.