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8 antibody on 2 mm-core TMAs, with 5% cut off for positivity on TILs and tumor cells, respectively (Kappa = 0.8). The most accurate methodology for routine evaluation of PD-1 and PD-L1 expression in UTUC may be based on 2 mm-core TMAs using NAT105 and 28.8 antibodies with a 5% cut off for positivity on TILs and tumor cells, respectively. The most accurate methodology for routine evaluation of PD-1 and PD-L1 expression in UTUC may be based on 2 mm-core TMAs using NAT105 and 28.8 antibodies with a 5% cut off for positivity on TILs and tumo