We know that  Levoleucovorin (see structure; source : chemspider) is  used to treat or prevent toxic effects of methotrexate in people who have received methotrexate to treat bone cancer. 
Recently, Spectrum Pharmaceuticals announced        that it has met with the FDA regarding it’s supplemental New Drug        Application (sNDA) for FUSILEV® (levoleucovorin) for        injection for the treatment of patients with advanced metastatic        colorectal cancer. The company is expected to  to submit in        the third quarter of 2010. The FDA did not request any additional        efficacy studies. Hope the FDA will  approve the drug  for advanced metastatic colorectal cancer...
Ref  : http://investor.spectrumpharm.com/releasedetail.cfm?ReleaseID=439605 
