Figure 3


Biphasic synovial sarcoma (a) with membranous claudin-4 expression in the epithelial component and negative staining in the spindle cell component (b). Ovarian clear cell carcinoma (c) with loss of ARID1A (inset) and diffuse immunoreactivity for claudin-4 (d), in contrast to ovarian small cell carcinoma of hypercalcemic type (e) with loss of SMARCA4 (inset), which was completely negative for claudin-4 (f).