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The diversity of S\u00e9zary cell (SC) phenotype and genotype may reflect either plasticity or heterogeneity, which was difficult to evaluate dynamically until the achievement of long-term SC expansion. Therefore, we developed six defined culture conditions allowing for the expansion of SC defined by their phenotype and monoclonality in four of seven SS cases. Engraftment of SC through the intrafemoral route into immunodeficient NOD.Cg-Prkdc(scid)Il2rg(<jats:italic>tm1Wjll<\/jats:italic>)\/SzJ (NSG) mice was achieved in 2 of 14 SS cases. Secondary xenograft by percutaneous injection mimicked most of the features of SS with dermal infiltration, epidermotropism, and blood spreading. These models also allowed assessing the intra-individual heterogeneity of patient SC. Subclones sharing the same TCR gene rearrangement evolved independently according to culture conditions and\/or after xenografting. This clonal selection was associated with some immunophenotypic plasticity and limited genomic evolution both in vitro and in vivo. The long-term amplification of SC allowed us to develop eight new SC lines derived from four different patients. These lines represent the cell of origin diversity of SC and provide new tools to evaluate their functional hallmarks and response to therapy.<\/jats:p>","DOI":"10.1038\/s41375-020-01068-2","type":"journal-article","created":{"date-parts":[[2020,10,26]],"date-time":"2020-10-26T15:03:47Z","timestamp":1603724627000},"page":"1696-1709","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Xenograft and cell culture models of S\u00e9zary syndrome reveal cell of origin diversity and subclonal heterogeneity"],"prefix":"10.1038","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8783-0709","authenticated-orcid":false,"given":"Sandrine","family":"Poglio","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martina","family":"Prochazkova-Carlotti","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Floriane","family":"Cherrier","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8958-3745","authenticated-orcid":false,"given":"Audrey","family":"Gros","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elodie","family":"Laharanne","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anne","family":"Pham-Ledard","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marie","family":"Beylot-Barry","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0305-0850","authenticated-orcid":false,"given":"Jean-Philippe","family":"Merlio","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,10,26]]},"reference":[{"key":"1068_CR1","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1016\/j.ejca.2018.01.076","volume":"93","author":"JJ Scarisbrick","year":"2018","unstructured":"Scarisbrick JJ, Hodak E, Bagot M, Stranzenbach R, Stadler R, Ortiz-Romero PL, et al. 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