ALDH1A1 and neoplasm: Moreover, if we performed subcategory analysis based on the different cutoff values of ALDH1A1 expression, the different regions of origin of the patients, the different clinical stages of the patients selected, and the different antibodies used in studies, the relationships between ALDH1A1 expression and some clinicopathological parameters, including tumor size, LNM, and the expression of HER2, are slightly different.