Fig. 1From: Validation and interpretation of Pan-TRK immunohistochemistry: a practical approach and challenges with interpretationDifferent patterns of pan-TRK immunostaining with proven ETV6-NTRK3 fusion cases. A-B, Secretory carcinoma of the breast with diffuse nuclear and cytoplasmic staining. C-D, Focal and weak expression of Pan-TRK staining in secretory carcinoma of the parotid gland (Original magnification × 200, insets × 400)Back to article page