PBMCs of 42 healthy volunteers were examined, revealing that the ratio of CD45+EpCAM+ in PBMCs of patients with lung cancer was significantly higher than that of healthy volunteers (patients 0.244 ± 0.353 vs. heath volunteers 0.012 ± 0.004, presented as mean ± SD, Figures 2B,C). Here, PTPRC is linked to lung cancer.