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Folia Histochemica et Cytobiologica 2014

The glycomic profile of invasive ductal carcinoma of the breast is altered in patients with hypoxic regions: implications for tumor behavior.

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Krækjan er vistuð á klemmuspjaldið
Moacyr Jesus Barreto de Melo Rêgo
Antônio Felix da Silva Filho
Marina Ferraz Cordeiro
Petra Barros Santos
Eduardo Isidoro Carneiro Beltrão

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Hypoxic areas in solid tumors are often associated with poor prognosis and resistance to chemotherapy. The aim of the study was to analyze the expression of galectin-1 (Gal-1), galectin-3 (Gal-3), sialic acid and b1-6 branched glycan structures in hypoxic environment of invasive ductal carcinoma (IDC) of the breast. We performed lectin histochemistry with phytohemag glutinin-L (L-PHA) and Sambucus nigra lectin (SNA); and immunohistochemistry for Gal-1, Gal-3, carbonic anhydrase IX, hypoxia-inducible factor, estrogen receptor (ER), progesterone receptor and human epidermal growth factor receptor type-2 for 86 IDC samples. Patients with markers positive for hypoxia were mostly ER-negative (p = 0.003) and presented with more nodal invasion than the non-hypoxic group (p = 0.0439). Concerning the glycobiological aspects, the hypoxic group expressed more of Gal-3 (p = 0.0021) and SNA ligands (p = 0.0498), however, there was no association between lectin- and galectin-staining and clinical and histopathological data. Our results suggest a change in the glycomic profile of patients within hypoxic regions of IDC. However, further studies are needed to evaluate the role of lectin- and galectin-ligands in tumor's hypoxic environment, as well as their potential to be used as therapeutic targets.

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