Folate receptor α is associated with poor clinicopathological perspectives in breast carcinoma

Breast carcinoma is the commonest malignancy in females. Folate is required for the biosynthesis of nucleotide bases, amino acids, and other cellular methylation reactions in proteins and phospholipids. The high affinity folate receptor alpha (FRα) has been shown to be expressed in several kinds of human cancers.

In this descriptive-analytic study, sections from formalin-fixed paraffin-embedded tissue blocks of 50 cases of invasive ductal breast carcinoma (IDC) as well as 15 cases of non-neoplastic breast specimens were immunohistochemically stained with FRα antibody. Histopathological evaluation for various clinicopathological parameters was done and was correlated with FRα expression.

Positive FRα expression was more frequently detected in IDC (64%) compared to non-neoplastic breast specimens (20%). In IDC, Positive FRα expression was significantly associated with high tumor grade (p = 0.007), large tumor size (p < 0.001), high lymph node stage (p = 0.004), presence of angiolymphatic emboli (p = 0.001), presence of perineural invasion (p = 0.001). Significant association between FRα positivity and negative hormone receptors (estrogen and progesterone) (p < 0.001) and triple negative cases (p = 0.0021).

Our work demonstrates that FRα is over expressed in IDC compared to non-neoplastic breast tissue. Folate receptor α expression was associated with poor clinicopathological perspective. This work suggests that FRα may be an independent prognostic factor and supports the possibility of using FRα-targeted therapies of breast carcinoma. However, our work requires validation on larger cohort with correlation with survival data of patients.