Three diabetic C57BL/6 mice were transplanted with syngeneic NPC (1,000 neurospheres) and sustained release insulin implants (release rate: ∼0.1 U/24 hr/implant for >30 days) under the left kidney capsule and with syngeneic NPC alone (1,000 neurospheres) under the right kidney capsule. This evidence concerns the gene INS and nasopharyngeal carcinoma.