CNR1 and medulloblastoma: comprising 763 medulloblastoma samples, was examined for expression of the genes encoding CB1R and CB2R: CNR1 and CNR2. Both genes were expressed across all medulloblastoma subgroups (WNT (n = 70), SHH (n = 223), Group 3 (n = 144), and Group 4 (n = 326)), with CB1R expression highest in SHH subgroup tumors.