Associated protein expression of SP cells following combined treatment. (A) Expression of chemotherapeutic drug resistance-associated proteins and apoptosis-associated proteins following combined treatment. (B) SSTR subtypes in SP cells. SP, side population; SSTR, somatostatin receptor; OCT, octreotide; DDP, cisplatin; ABCB1, ATP-binding cassette subfamily B member 1; ABCG2, ATP-binding cassette subfamily G member 2; Bcl-2, B cell lymphoma-2; Bax, Bcl-2-associated X protein; PARP, poly(ADP-ribose) polymerase; COX IV, cytochrome c oxidase subunit IV.