This receptor was first identified in anaplastic large cell lymphoma (ALCL) as part of the fusion protein NPM-ALK [12], and it is abundantly expressed in different brain areas (cerebellum, hypothalamus, cerebral cortex, olfactory, amygdala, basal ganglia) where it shows a role in the normal development and function of the nervous system [11]. Here, ALK is linked to anaplastic large cell lymphoma.