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[Original research] [Morphology]
Grigory Demyashkin; Andrey Ryzhov; Alexey Sidorin; Margarita Gevandova; Vladimir Ivanovich Shchekin; Anna Kolyada;
Glycogen-rich clear cell carcinoma (GRCC) is a rare variant of invasive ductal carcinoma (about 1–3 %). Cases diagnosed with GRCC (n=9) were discovered in archival materials of breast cancer (n=2240, from 2010 to 2017). The existence of the PASpositive cancer cells, as well as a moderate degree of cell proliferation of Ki-67 (26,3±0,1 %) against the background of p63 decrease (7,1±0,1 %) and an increase of HER2/neu expression (82,2±0,5 %), in the absence of ER and PGR labeling was found by using a complex of morphological and immunohistochemical methods. Based on the data obtained, it can be concluded that this tumor has a dismal prognosis.
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Keywords: breast carcinoma, glycogen-rich clear cell carcinoma, Ki-67, p53, HER2/neu, ER, PGR