GRPR and glioblastoma: A similar strategy has been studied experimentally in glioblastomas (167) by examining the effects of a cytotoxic Bn-analogue, AN-215 [i.e., a Bn carrier conjugated to the doxorubicin analogue, 2-pyrrolino-doxorubicin(AN-201)] on the human glioblastoma cell lines U-118MG, which expresses GRPR (145, 168), and U-87MG, which expresses both GRPR and NMBR (167) (Table 1).