“…Recently, between 2015 and 2018, 18 case reports or small series described 27 patients who developed BP while receiving anti PD-1/PD-L1 therapy, including three with negative DIF ( 35 , 37 ) or without DIF confirmation ( 47 ) but with typical clinical presentations (Tables 1 , 2 ). Fourteen patients received anti PD-1 nivolumab therapy (patients 2, 4, 7, 9, 10, 13, 15, 18, 20, 22, 23, and 25–27) ( 33 , 35 , 38 , 42 , 44 , 46 , 47 , 49 ), 11 received anti PD-1 pembrolizumab therapy (patients 1, 5, 6, 8, 11, 12, 14,16, 19, 21, and 24) ( 32 , 34 – 37 , 39 , 40 , 43 , 45 , 48 ), one received anti-PD-L1 durvalumab therapy (patient 3) ( 33 ), and one received anti-PD-L1 atezolizumab therapy (patient 17) ( 41 ). Six of the 27 patients received ipilimumab therapy before anti PD-1, one received an association of ipilimumab and nivolumab therapy, and one received ipilimumab therapy after treatment with nivolumab.…”