Figure 2: Association of human leukocyte antigen Class I expression into primary tumor lesions with overall survival in patients with colorectal cancer using the Kaplan–Meier method. Differences in patients' survival were analyzed using a log-rank test. The overall survival in patients with human leukocyte antigen downexpression (blue line) was lower than that of those with human leukocyte antigen loss (green line) or normal (yellow line) expression (<i>P</i> = 0.04)
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