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Immunohistochemical expression of estrogen receptor α and β in pituitary adenomas
Author(s) -
Manoranjan Branavan,
Salehi Fateme,
Scheithauer Bernd W,
Rotondo Fabio,
Kovacs Kalman,
Cusimano Michael D
Publication year - 2009
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.23.1_supplement.925.10
Subject(s) - immunohistochemistry , estrogen receptor , estrogen , pituitary tumors , pathology , estrogen receptor beta , pathological , estrogen receptor alpha , tumor progression , pituitary adenoma , carcinogenesis , biology , adenoma , endocrinology , medicine , cancer , breast cancer
Estrogen is involved in pituitary tumorigenesis, acting through estrogen receptors alpha (ERα) and beta (ERβ). Our study investigated the prognostic value of ERα/ERβ as markers in pituitary adenomas. Tissue samples and clinico‐pathological data (patient age and sex, tumor size, invasiveness and recurrence) were obtained from 78 patients with pituitary adenomas. Immunohistochemistry was performed using the streptavidin‐biotin‐peroxidase complex method. A monoclonal and polyclonal antibody were used for ERα and ERβ expression respectively. Intensity of ERα/ERβ expression was evaluated using a scale of 0 to 3. Percentage of positive cells was evaluated on a scale of 0 to 4. ERα immunopositivity was evident in 40 of 78 cases (51%), while ERβ stained positive in 49 of 78 cases (63%). No correlation was found between ERβ expression and pituitary tumor cell types or clinico‐pathological factors. A significant difference was present in ERα expression between different tumor types. ERα positivity was present to a greater extent in macroadenomas. This finding supports the role of ERα in tumor growth and progression. Elevated ERα positivity and intensity were also found in non‐invasive adenomas. It appears that ERα may be a valuable biological marker for tumor size and invasiveness, while ERβ is a poor marker. The role of ERα expression in pituitary tumor initiation and progression warrants further investigation.