ITGB4 and ovarian cancer: Second, in a collection of ovarian cancer formalin-fixed, paraffin-embedded (FFPE) tissues including specimens of intraperitoneal carcinosis and malignant ascites (n = 46), we additionally analyzed the level of ITGB4 expression in the TCs and the presence of tumor-associated CD45+ leukocytes based on the respective IHC scores ranging from low (0 + 1) to high (2 + 3) (ITGB4) and 0 to 3 (CD45).