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Several studies have shown that the development of FIL is closely associated with PIK3CA mutations. This study aimed to further identify rare clinical features and underlying molecular variants in patients with FIL.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Eighteen patients were included in this study, and all patients presented with infiltrating adipose tissues confirmed by magnetic resonance imaging. Macrodactyly, polydactyly, hemimegalencephaly and hemihyperplasia were also observed in patients with FIL. In total, eight different PIK3CA mutations were detected in tissues obtained from sixteen patients, including the missense mutations p.His1047Arg (n\u2009=\u20094), p.Cys420Arg (n\u2009=\u20092), p.Glu453Lys (n\u2009=\u20092), p.Glu542Lys (n\u2009=\u20092), p.Glu418Lys (n\u2009=\u20091), p.Glu545Lys (n\u2009=\u20091), and p.His1047Tyr (n\u2009=\u20091) and the deletion mutation p.Glu110del (n\u2009=\u20093). Furthermore, the GNAQ mutation p.Arg183Gln was detected in the epidermal nevus tissue of one patient. Imaging revealed that several patients carrying hotspot mutations had more severe adipose infiltration and skeletal deformities.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The abundant clinical presentations and genetic profiles of FIL make it difficult to treat. PIK3CA mutations drive the pathogenesis of FIL, and PIK3CA hotspot mutations may lead to more extensive infiltration of lipomatosis. Understanding the molecular variant profile of FIL will facilitate the application of novel PI3K-targeted inhibitors.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s13023-023-02786-3","type":"journal-article","created":{"date-parts":[[2023,7,14]],"date-time":"2023-07-14T00:02:06Z","timestamp":1689292926000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Delineation of the phenotypes and genotypes of facial infiltrating lipomatosis associated with PIK3CA mutations"],"prefix":"10.1186","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6943-3299","authenticated-orcid":false,"given":"Hongrui","family":"Chen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bin","family":"Sun","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Gao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yajing","family":"Qiu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Hua","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7325-1367","authenticated-orcid":false,"given":"Xiaoxi","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,7,14]]},"reference":[{"issue":"6","key":"2786_CR1","doi-asserted-by":"publisher","first-page":"1544","DOI":"10.1097\/00006534-200111000-00017","volume":"108","author":"BL Padwa","year":"2001","unstructured":"Padwa BL, Mulliken JB. 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