Table III. Assessment of periostin (POSTN) expression in cancer-associated fibroblasts (CAFs) in female dogs using modified semi-quantitative immunoreactive score (IRS) compatible with Remmele and Stegner (31). Assessment of POSTN expression in CAFs depending on histopathological diagnosis, the malignancy grade, expression of Ki-67 and ERB-B2 receptor tyrosine kinase 2 (ERBB2) in malignant mammary cancer in female dogs.