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This approach may shed light on the biological behavior of cancers and their taxonomy, but has not yet been applied to characterize collagen fibers in cases diagnosed as invasive breast carcinoma (BC) of histological special types (IBC-ST). Tissue sections from 99 patients with IBC-ST and 21 of invasive breast carcinoma of no special type (IBC-NST) were submitted to evaluation of collagen parameters by SHG. Tissue microarray was performed to evaluate immunohistochemical-based molecular subtype. In intratumoral areas, fSHG and bSHG (forward-SHG and backward-SHG) collagen parameters achieved their lowest values in mucinous, papillary and medullary carcinomas, whereas the highest values were found in classic invasive lobular and tubular carcinomas. Unsupervised hierarchical cluster analysis and minimal spanning tree using intratumoral collagen parameters allowed the identification of three main groups of breast cancer: group A (classic invasive lobular and tubular carcinomas); group B (IBC-NST, metaplastic, invasive apocrine and micropapillary carcinomas); and group C (medullary, mucinous and papillary carcinomas). Our findings provide further characterization of the tumor microenvironment of IBC-ST. This understanding may add information to build more consistent tumor categorization and to refine prognostication.<\/jats:p>","DOI":"10.1038\/s41598-019-44156-9","type":"journal-article","created":{"date-parts":[[2019,5,22]],"date-time":"2019-05-22T10:04:48Z","timestamp":1558519488000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Exploring Collagen Parameters in Pure Special Types of Invasive Breast Cancer"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7843-3314","authenticated-orcid":false,"given":"Rodrigo de Andrade","family":"Natal","sequence":"first","affiliation":[]},{"given":"Geisilene R.","family":"Paiva","sequence":"additional","affiliation":[]},{"given":"Vitor B.","family":"Pelegati","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9747-5640","authenticated-orcid":false,"given":"Ludwing","family":"Marenco","sequence":"additional","affiliation":[]},{"given":"C\u00e9sar A.","family":"Alvarenga","sequence":"additional","affiliation":[]},{"given":"Renato F.","family":"Vargas","sequence":"additional","affiliation":[]},{"given":"Sophie F.","family":"Derchain","sequence":"additional","affiliation":[]},{"given":"Luis O.","family":"Sarian","sequence":"additional","affiliation":[]},{"given":"Camille","family":"Franchet","sequence":"additional","affiliation":[]},{"given":"Carlos L.","family":"Cesar","sequence":"additional","affiliation":[]},{"given":"Fernando C.","family":"Schmitt","sequence":"additional","affiliation":[]},{"given":"Britta","family":"Weigelt","sequence":"additional","affiliation":[]},{"given":"Jos\u00e9","family":"Vassallo","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2019,5,22]]},"reference":[{"key":"44156_CR1","doi-asserted-by":"publisher","first-page":"192","DOI":"10.1016\/j.molonc.2010.04.004","volume":"4","author":"B Weigelt","year":"2010","unstructured":"Weigelt, B., Geyer, F. 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