Generally, based on the results of FOLR1 IHC staining, a PS2 + scoring system is employed (where tumor cells exhibit moderate intensity 2 + and/or strong 3 + membrane staining proportions) to determine the expression level of FRα, with a staining proportion of ≥ 75% indicating high expression, 50%−74% indicating moderate expression, and < 50% indicating low expression. Here, FOLR1 is linked to neoplasm.