The present invention provides methods for treating patients diagnosed with colorectal cancer and metastatic colorectal cancers in a chemotherapeutic regimen comprising the administration of [6R]-5,10-methylene tetrahydrofolate (6R-MTHF), 5-fluorouracil (5-FU), bevacizumab, and oxaliplatin. The methods reduce disease progression and provide improved overall response rates compared to standard treatments with other folates such as folinic acid.
