PYCR1 and esophageal squamous cell carcinoma: Moreover, the results in tissue arrays from 78 ESCC patients showed that the high expression rate of PYCR1 protein in ESCC tissues was 55.13% (43/78), the high expression rate of PYCR1 protein in adjacent non-tumor tissues was 38.46% (30/78), and there was significant difference between the two groups (P < 0.05; Table 5).