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Phase III trial comparing UFT + PSK to UFT + LV in stage IIB, III colorectal cancer (MCSGO-CCTG)

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Oral adjuvant uracil and tegafur plus leucovorin (UFT/LV) is not inferior to standard weekly fluorouracil and folinate for stage II/III colon cancer. However, protein-bound polysaccharide K (PSK) has been evaluated as postoperative adjuvant therapy for colorectal cancer. This report is the first of MCSGO-CCTG, which compared UFT/LV to UFT/PSK as adjuvant chemotherapy for stage IIB or III colorectal cancer in patients who had undergone Japanese D2/D3 lymph node dissection.


The primary endpoint was the 3-year disease-free survival (DFS). A randomized non-inferiority study compared UFT/LV to UFT/PSK. The overall survival, adverse events, compliance, and quality of life were also investigated as the secondary endpoints.


Between March 2006 and December 2010, 357 patients were randomized to UFT/PSK (n = 178) or UFT/LV (n = 179) (median age 65 years, colon/rectum 67.4/32.6%, stage IIB/IIIA/IIIB/IIIC 11.1/15.7/55.0/18.2%). The 3-year DFS rate was 82.3% in those receiving UFT/LV and 72.1% in those receiving UFT/PSK. The non-inferiority of UFT/PSK adjuvant therapy to UFT/LV therapy was not verified (−9.06%, 90% confidence interval −17.06 to −1.06%). The 3-year overall survival rate was 95.4% in those receiving UFT/LV and 90.7% in those receiving UFT/PSK.


As adjuvant chemotherapy for stage IIB and III colorectal cancer patients, UFT/PSK adjuvant therapy was not non-inferior to UFT/LV therapy with respect to the DFS.

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This study was supported by a Grant from The Supporting Center for Clinical Research and Education (Osaka, Japan), a nonprofit foundation. We thank Dr. Yuko Ohno and Makoto Fujii for the statistical analysis. We also thank the patients for their participation in this study and the study management teams and staff at the individual study sites.

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Correspondence to Takeshi Kato.

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Yasuhiro Miyake, Junichi Nishimura, and other co-authors have no conflict of interest.

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Miyake, Y., Nishimura, J., Kato, T. et al. Phase III trial comparing UFT + PSK to UFT + LV in stage IIB, III colorectal cancer (MCSGO-CCTG). Surg Today 48, 66–72 (2018). https://doi.org/10.1007/s00595-017-1555-1

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  • Colorectal cancer
  • Adjuvant therapy
  • Protein-bound polysaccharide K
  • UFT/LV
  • Stage IIB
  • Stage III