Expression of CD56 and WT1 in ovarian stroma and ovarian stromal tumors

The American Journal of Surgical Pathology
Huiying HePeiguo G Chu

Abstract

The immunophenotype of ovarian stroma and spindle cell tumors derived from ovarian stroma has not been well studied. We studied the expression of CD56, WT1, estrogen receptor-beta (ER-beta), progesterone receptor (PR), smooth muscle actin, S-100, CD34, and muscle specific actin in 16 normal ovaries, 17 ovarian fibromas, 11 ovarian cellular fibromas, 10 ovarian fibrothecomas, and 11 ovarian leiomyomas. In addition, we studied CD56 and WT1 expression in 7 cases of normal endometrium, 8 uterine smooth muscle tumors, 5 endometrial stromal tumors and 64 nongynecologic (GYN) spindle cell sarcomas. All normal ovaries, ovarian fibromas, fibrothecomas, and ovarian leiomyomas were positive for CD56 and WT1. Most of the normal ovaries, ovarian fibromas, ovarian fibrothecomas, and ovarian leiomyomata also expressed ER-beta and PR. Eight of 17 ovarian fibromas, 5 of 11 ovarian cellular fibromas, and 4 of 10 ovarian fibrothecoma with focal fibroblastic differentiation were positive for smooth muscle actin. A few cases of these tumors also expressed S-100 and CD34. Only rare cases of non-GYN spindle cell sarcomas expressed WT1. Our study results show that ovarian fibromas, fibrothecomas, and leiomyomas have a similar immunophenotype (positive...Continue Reading

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