AIM: To study the targeting therapeutic effect of mitomycin C polybutylcyanoacrylate magnetic nanoparticles (MMC-PBCA-MNPS) on nude mice transplanted subcutaneously by Bel-7402 cell lines. METHODS: Thirty nude mice transplanted subcutaneously by Bel-7402 cell lines were randomly divided into six groups (n=5). Each group was given, through tail vein, mitomycin normal saline (MMC), MMC-PBCA-MNPS and saline as control respectively. The groups of MMC-PBCA-MNPS were divided into magnetic field and nonmagnetic fi...