CD274 and Henoch-Schoenlein purpura: PD-L1 positivity was most prominent in diabetic nephropathy (DN), ANCA-associated vasculitis (AAV) and lupus nephritis (LN), but also focal-segmental glomerulosclerosis (FSGS), acute tubulo-interstitial nephritis (AIN) and IgA vasculitis (Figure 2C).