VTCN1 and ovarian carcinoma: Furthermore, while robust expression of B7-H4 protein was observed in ovarian cancer tissues, varying degrees of expression, ranging from weak to strong, were also detected in human mammary glands, kidneys, pancreatic islet cells, esophagus, salivary glands, and liver, thus updating prior assumptions regarding the spectrum of B7-H4 expression in healthy human tissues.