ANGPT2 and neoplasm: Of note, the serum‐free CM of rat NF‐PitNET cells promoted the viability of isolated rat primary ECs (+20%; P = 0.036; Fig EV2) indicating that tumor‐borne angiopoietins (in NF‐PitNETs primarily Angpt2) might work as cytokines on ECs within the tumor TME.