PIK3CB and diffuse large B-cell lymphoma: To further investigate the association between CNVs of PI3K subunits and their protein expression, and the significance of Class I subunits in DLBCL, we analyzed the expression of p110α, p110β, p110γ, p110δ, and pAKT protein in a TMA of 60 DLBCLs using IHC.