SSTR2 and neoplasm: Despite this, BASS labeled with 64Cu via the chelator 4, 11-bis(carboxymethyl)-1,4,8,11-tetraazabicyclo [6.6.2]hexadecane (CB-TE2A) (64Cu-CB-TE2A-BASS) showed a compromised tumor uptake compared to the agonist 64Cu-CB-TE2A-octreotate in SSTR2-positive AR42J xenografts (129).