IL6 and schizophrenia: When partial correlations, controlling for daily mean chlorpromazine equivalent dose, were applied to test the robustness of the relationship between cytokines and prefrontal cortex volume in people with schizophrenia, the correlation between SFG volume and IL-6 mRNA levels reduced from −0.700 (P<0.001) to −0.441 (P=0.024), but remained statistically significant.