CD8A and neoplasm: We confirmed that immunoproteasome subunit expression strongly correlated with ICT response when tumor purity and the expression of constitutive proteasome subunits, mutational load, IFNγ, and CD8+ T-cell abundance were controlled for (Kendall tau = 0.33, P < 0.06), again pointing to the independent contribution of IP subunits to the ICT response.