Medical Oncology

, Volume 27, Issue 4, pp 1277–1285

The effect of DNA mismatch repair (MMR) status on oxaliplatin-based first-line chemotherapy as in recurrent or metastatic colon cancer

  • Seung Tae Kim
  • Jeeyun Lee
  • Se Hoon Park
  • Joon Oh Park
  • Ho Yeong Lim
  • Won Ki Kang
  • Jin Yong Kim
  • Young Ho Kim
  • Dong Kyung Chang
  • Poong-Lyul Rhee
  • Dae Shick Kim
  • Haeran Yun
  • Yong Beom Cho
  • Hee Cheol Kim
  • Seong Hyeon Yun
  • Ho-Kyung Chun
  • Woo Yong Lee
  • Young Suk Park
Original Paper

DOI: 10.1007/s12032-009-9374-x

Cite this article as:
Kim, S.T., Lee, J., Park, S.H. et al. Med Oncol (2010) 27: 1277. doi:10.1007/s12032-009-9374-x
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Abstract

Colon cancer with DNA mismatch repair (MMR) defects reveals distinct clinical and pathologic features, including a better prognosis but reduced response to 5-fluorouracil (5-FU)-based chemotherapy. A current standard treatment for recurrent or metastatic colon cancer uses capecitabine plus oxaliplatin (CAPOX), or continuous-infusion fluorouracil plus oxaliplatin (FOLFOX). This study investigated the effect of MMR status on the treatment outcomes for CAPOX and FOLFOX as first-line combination chemotherapy in recurrent or metastatic colon cancer. We analyzed 171 patients who had been treated with CAPOX or FOLFOX as first-line combination chemotherapy in recurrent or metastatic colon adenocarcinoma between February 2004 and July 2008. Tumor expression of the MMR proteins, MLH1 and MSH2, was detected by immunohistochemistry (IHC) in surgically resected tumor specimens. The microsatellite instability (MSI) was analyzed by polymerase chain reaction (PCR) amplification, using fluorescent dye-labeled primers specific to microsatellite loci. Tumors with MMR defect were defined as those demonstrating a loss of MMR protein expression (MMR-D) and/or a microsatellite instability-high (MSI-H) genotype. In all, 75 patients (44%) received FOLFOX, and 96 patients (56%) received CAPOX as first-line combination chemotherapy. The incidence of colon cancer with MMR defect was 10/171 (6%). Colon cancers with MMR defect (MSI-H and/or MMR-D) are more commonly located in proximal to the splenic flexure (p = 0.03). The MMR status did not significantly influence the overall response (p = 0.95) to first-line CAPOX or FOLFOX treatment in patients with recurrent or metastatic colon cancer. According to the MMR status, there was no significant difference for PFS (p = 0.50) and OS (p = 0.47) in patients with recurrent or metastatic colon cancer treated with first-line CAPOX or FOLFOX. In colon cancers with MMR defect, there was no significant difference for PFS (p = 0.48) and OS (p = 0.56) between CAPOX and FOLFOX as first-line combination chemotherapy. However, in MMR intact, there was significant difference for OS between CAPOX and FOLFOX (p = 0.04). OS was significantly better in patients treated with CAPOX when compared to patients with FOLFOX. The MMR status does not predict the effect of oxaliplatin-based combination chemotherapy as 1st line in recurrent or metastatic colon cancers. CAPOX in the first-line treatment of recurrent or metastatic colon cancer with MMR intacts showed a superior OS compared with FOLFOX unlike colon cancer with MMR defects.

Keywords

MMRMSICAPOXFOLFOX

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Seung Tae Kim
    • 1
  • Jeeyun Lee
    • 1
  • Se Hoon Park
    • 1
  • Joon Oh Park
    • 1
  • Ho Yeong Lim
    • 1
  • Won Ki Kang
    • 1
  • Jin Yong Kim
    • 2
  • Young Ho Kim
    • 2
  • Dong Kyung Chang
    • 2
  • Poong-Lyul Rhee
    • 2
  • Dae Shick Kim
    • 3
  • Haeran Yun
    • 4
  • Yong Beom Cho
    • 4
  • Hee Cheol Kim
    • 4
  • Seong Hyeon Yun
    • 4
  • Ho-Kyung Chun
    • 4
  • Woo Yong Lee
    • 4
  • Young Suk Park
    • 1
  1. 1.Division of Hematology-Oncology, Department of Medicine, Samsung Medical CenterSungkyunkwan University School of MedicineSeoulSouth Korea
  2. 2.Divisions of Gastroenterology, Department of Medicine, Samsung Medical CenterSungkyunkwan University School of MedicineSeoulSouth Korea
  3. 3.Department of Pathology, Samsung Medical CenterSungkyunkwan University School of MedicineSeoulSouth Korea
  4. 4.Department of Surgery, Samsung Medical CenterSungkyunkwan University School of MedicineSeoulSouth Korea