SSTR2 and osteosarcoma: Conversely, the U2OSSSTR2, an SSTR-negative human osteosarcoma cell line transfected to stably express SSTR2 [34], had a 250 times higher internalized fraction (250 mBq/cell) compared to our HBL cell line (1 mBq/cell in [9]) after 2 h incubation with 177Lu-DOTATATE (in both cases).