Monarch Disease Ontology id MONDO_0017603 (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). Also known as: ALCL, ALK-, ALK- ALCL, ALK- anaplastic large cell lymphoma, anaplastic large cell lymphoma, ALK-negative.