Folate Receptor-α (FOLR1) Expression and Function in Triple Negative Tumors
Fig 3
Representative FOLR1 staining from breast cancer subtypes.
(A) benign breast tissue (B9) with negative staining (IHC score 0), (B) estrogen receptor positive invasive ductal carcinoma (ER+IDC) with negative staining (IHC score 0), (C) estrogen receptor positive invasive lobular carcinoma (ER+ILC) with negative staining (IHC score 0), (D) human epidermal growth factor receptor positive (HER2+) with strong 3+ staining (left core) and weak 1+ staining (middle/right cores), and (E) triple negative (TNBC) tumors with strong 3+ staining (left core) and moderate 2+ staining (middle/right cores).