Estrogen and progesterone receptor expression in uterine and extrauterine leiomyosarcomas: an immunohistochemical study.
The authors have noted anecdotal cases of extrauterine leiomyosarcomas (LMS) with estrogen receptor (ER) and progester-one receptor (PR) immunoreactivity. However, there are few studies that have compared ER and PR immunoexpression in LMS of uterine and extrauterine origin. The authors obtained a representative formalin-fixed, paraffin-embedded tissue block from cases of uterine LMS (n = 15) and extrauterine LMS (n = 16) from the archives of the Cleveland Clinic Foundation and performed immunohistochemical staining for ER and PR. Staining was evaluated by 2 observers in a semiquantitative manner using the following scale: 0, no nuclear staining; 1+, 1 to 25% of nuclei stained; 2+, 26 to 50% of nuclei stained; 3+, 51 to 75% of nuclei stained; 4+, 76 to 100% of nuclei stained. The majority of uterine LMS stained for ER (13 of 15, 87%), PR (12 of 15, 80%), or both ER and PR (12 of 15, 80%), with most cases showing 3+ or 4+ positive staining. For the extrauterine LMS cases, staining for ER was seen in 4 of 16 cases (25%), staining for PR was observed in 2 of 16 cases (13%), and staining for both ER and PR was seen in 2 of 16 cases (13%). One extrauterine LMS showed 4+ coexpression of ER and PR, but the remaining extrauterine cases showed only 1+ ER and/or PR immunoreactivity. These data suggest that most uterine LMS coexpress ER and PR, and most extrauterine LMS do not stain for these antigens. However, a subset of extrauterine LMS are ER and/or PR immunoreactive. This raises the possibility that hormonal manipulation may be beneficial in the treatment of these therapeutically recalcitrant tumors.
Kelley
Todd W
TW
Department of Anatomic Pathology, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.
Borden
Ernest C
EC
Goldblum
John R
JR
D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007890:Leiomyosarcoma / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D011960:Receptors, Estrogen / Q000032:analysis* / Q000378:metabolism; D011980:Receptors, Progesterone / Q000032:analysis* / Q000378:metabolism; D012737:Sex Factors; D014594:Uterine Neoplasms / Q000378:metabolism*; D014599:Uterus / Q000276:immunology / Q000473:pathology
D011960:Receptors, Estrogen; D011980:Receptors, Progesterone