label: ALK-negative anaplastic large cell lymphoma
label_lc: alk-negative anaplastic large cell lymphoma
description: "ALK-negative anaplastic large cell lymphoma (ALK- ALCL) is a type of ALCL, a rare and aggressive peripheral T-cell non-Hodgkin lymphoma affecting lymph nodes and extranodal sites, which is characterized by the lack of expression of a protein called anaplastic lymphoma kinase (ALK)."