Evaluation of serum alkaline phosphatase and lactate dehydrogenase as predictive biomarkers for the prognosis of male breast cancer.

Breast cancer has become one of the most common malignant tumors in women, and the incidence rate is increasing annually in men. This study focused on exploring the prognostic significance of the combined detection of serum ALP and LDH in patients with breast cancer. We enrolled 80 individuals with male breast cancer (MBC), female breast cancers (FBCs) were randomly matched via propensity score matching (PSM). In the MBC cohort, the optimal cutoff values for ALP and LDH were determined to be 114 U/L and 207 U/L, respectively, whereas in the FBC cohort, they were 68 U/L and 133 U/L, respectively. There was a difference in median survival between patient groups classified by the optimal cutoff values of ALP and LDH in the FBC cohort. However, in the FBC cohort, there was no significant correlation between the levels of ALP or LDH and patient prognosis. We developed a "joint score" system that incorporates the values of both ALP and LDH and separates MBCs into three groups. Survival was significantly different among the three groups. In the multivariate analysis, the "joint score" was identified as an independent prognostic factor for both disease-free survival(DFS) and overall survival (OS).