ABCA1 and neoplasm: The high-risk group showed higher levels of NK CD56bright cells and NK cells, while the CRC patients in the low-risk group showed increased infiltration levels of aDC, DC, macrophages, neutrophils, T cells, T helper cells, Tcm, Tgd, Th1 cells and Th2 cells, which suggested that patients in the low-risk group had stronger tumor immune response relative to the high-risk group, and the infiltration of these immune cells may possibly affect the prognosis of CRC patients.