The 5th edition of the World Health Organization (WHO) classification of haematolymphoid tumours used the hierarchical system to classify T-cell and NK-cell lymphoid proliferations and lymphomas (T/NK-LPD/LYM) based on research advances and clinicopathological characteristics of the diseases. In this edition of classification, tumour-like lesions were included, some tumors were added/deleted, the names or terms of certain diseases were refined, and the diagnostic criteria or subtypes of some diseases were revised. This group of diseases was reintegrated from non-clonal hyperplasia to highly aggressive lymphoma, which would further reflect the nature of T/NK-LPD/LYM and benefit to clinical application.
第5版WHO造血与淋巴组织肿瘤分类对T细胞和NK细胞增生性疾病和淋巴瘤（T-cell and NK-cell lymphoid proliferations and lymphomas，T/NK-LPD/LYM）根据研究进展以及疾病的临床病理特征，采用了分级系统进行分类。同时纳入了瘤样病变，引入/删除一些肿瘤，修改某些疾病的名称，并修订一些疾病的诊断标准或亚型，将这组疾病从非克隆性增生到高度侵袭性淋巴瘤进行了重新整合，更体现了T/NK-LPD/LYM的疾病本质，有利于临床应用。.