ALDH1A2 and neoplasm: To confirm the prognostic value of the candidate gene ALDH1A2 in the protein level, we determined ALDH1A2 protein levels by immunohistochemical (IHC) staining in primary tumor tissues from patients with cervical cancer, and we found the heterogeneous cytoplasmic expression of ALDH1A2 in tumor tissues (Figure 5A).