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Due to the low incidence and heterogeneity, information regarding the aetiology, physiopathology and genetics of paediatric mature (non\u2010anaplastic) T\/<jats:styled-content style=\"fixed-case\">NK<\/jats:styled-content>\u2010cell lymphoma is lacking. In addition, standard treatments have not yet been established. In the absence of randomised clinical trials, anthracycline\u2010containing regimens are usually considered as the first treatment option, but with discouraging outcomes, especially in patients with advanced disease. The implementation of autologous or allogeneic stem cell transplantation as upfront consolidation therapy or for chemotherapy\u2010sensitive relapsed disease have resulted in improved survival for some patient subsets. The recent use of novel targeted molecular and immunotherapeutic agents has also been shown to be promising in small numbers of patients. In this context, we will review the current state of the scientific knowledge on the most common mature (non\u2010anaplastic, non\u2010cutaneous) T\/<jats:styled-content style=\"fixed-case\">NK<\/jats:styled-content>\u2010cell lymphomas occurring in children, adolescent and young adults.<\/jats:p>","DOI":"10.1111\/bjh.15767","type":"journal-article","created":{"date-parts":[[2019,2,1]],"date-time":"2019-02-01T11:51:01Z","timestamp":1549021861000},"page":"418-435","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Mature (non\u2010anaplastic, non\u2010cutaneous) T\u2010\/<scp>NK<\/scp>\u2010cell lymphomas in children, adolescents and young adults: state of the science"],"prefix":"10.1111","volume":"185","author":[{"given":"Allyson","family":"Flower","sequence":"first","affiliation":[{"name":"Department of Pediatrics New York Medical College Valhalla NY USA"},{"name":"Department of Microbiology &amp; Immunology New 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