High expression of ABCC3 may therefore cause a high conversion rate of LV to co-factor, and enhanced inhibition of TYMS...ABCC3 expression levels were divided into tertiles; the low, intermediate and high levels...The high expression group had a median PFS of 10.1 months compared to 6.5 months among patients in the low expression group... Folate-related genes predict response to treatment with FLV in stage III and IV CRC.