IL1A and schizophrenia: The rs3783550 SNP at IL1A was also found to be in perfect LD (R2 = 0.197 and D′ = 1) with the rs11677416 SNP at CKAP2L-IL1A, which has been found to have a strong signal for antipsychotic response in patients with schizophrenia treated with olanzapine54.