“…10,11 Such cells occur in large numbers in the connective tissue compartment of various anatomical locations such as the skin, gastrointestinal tract, uterine cervix, breast, pancreas, thyroid, salivary glands, and peripheral nervous system. [10][11][12][13] There is a demonstrable loss of stromal fibrocytes around deposits of invasive carcinoma and this has been shown to be partly accompanied by an increase in a-smooth muscle actin positive (a-SMA þ ) myofibroblasts in invasive colorectal adenocarcinoma, ductal adenocarcinoma of the pancreas, ductal breast cancer and squamous cell carcinoma of the uterine cervix. 10,12 This study examines if a panel of antibodies to calretinin, CD34, and a-SMA would be useful for the demonstration of the occurrence and distribution of mesothelial cells, stromal fibrocytes, and myofibroblasts as diagnostic discriminators for invasive and noninvasive peritoneal implants in SBTs of the ovary.…”