Abstract
Purpose
Microsatellite instability (MSI) and chromosomal instability are main mechanisms underlying colorectal carcinogenesis. We determined the features and prognosis of colorectal cancer based on MSI including mismatch repair genes and expression of p53.
Methods
Between 1999 and 2008, a total of 2,649 colorectal cancer patients were analyzed using a prospective database. A mismatch repair defect (MMR-D) was defined as a loss of expression of more than one MMR protein and/or MSI-high. MMR-proficiency (MMR-P) was defined as expression of all MMR proteins and microsatellite stable (MSS)/MSI-low. Groups 1 (G1), 2 (G2), 3 (G3), and 4 (G4) were defined as MMR-D and p53-positive expression, MMR-D and p53-negative expression, MMR-P and p53-positive expression, MMR-P and p53-negative expression, respectively.
Results
Eighty-two (3.0 %), 181 (6.8 %), 1,368 (51.7 %), and 1,018 (38.5 %) patients were classified into groups 1–4, respectively. Comparison between G1 and G2 showed differences in location (p < 0.001), size (p = 0.030), node metastasis (p = 0.027), distant metastasis (p = 0.009), and stage (p = 0.040). Comparison between G3 and G4 showed differences in location (p < 0.001) and histology (p < 0.001). Comparison between G1 and G3 showed differences in location (p < 0.001) and histology (p < 0.001). Comparison between G2 and G4 showed differences in age (p < 0.001), location (p < 0.001), size (p = 0.006), histology (p < 0.001), node metastasis (p < 0.001), distant metastasis (p < 0.001), and stage (p < 0.001). On multivariate analysis, stage (p = 0.007) and histology (p < 0.001) were associated with improved overall survival, and stage (p < 0.001) was associated with disease-free survival.
Conclusions
According to the MSI and p53 subsets, colorectal cancers showed different clinicopathologic features, but these subsets had no prognostic impact on overall and disease-free survival rate.
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Acknowledgment
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0016765). We thank Sun Woo Kim, Sook Young Woo, and Jung Hyeon Ahn of the Biostatistics Team, Samsung Biomedical Research Institute, for the statistical analysis of this study.
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Kim, H.R., Kim, H.C., Yun, HR. et al. An Alternative Pathway in Colorectal Carcinogenesis Based on the Mismatch Repair System and p53 Expression in Korean Patients with Sporadic Colorectal Cancer. Ann Surg Oncol 20, 4031–4040 (2013). https://doi.org/10.1245/s10434-012-2455-7
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DOI: https://doi.org/10.1245/s10434-012-2455-7