BDNF and schizophrenia: In conclusion, our findings implied that single polymorphism of rs6265 rs1387923, rs2769605, and rs1565445 in BDNF and NTRK2 did not demonstrate the association with the development of paranoid schizophrenia in a Han population, however, our finding suggested statistically significant role of interaction of BDNF and NTRK2 genes polymorphisms (BDNF-rs6265, NTRK2-rs1387923 and NTRK2-rs2769605) in schizophrenia susceptibility.