PDCD1 and ductal breast carcinoma in situ: In the context of intratumoural immune cells, there was no difference in immune cells infiltrates between pure DCIS and DCIS mixed apart from intratumoural CD20, which was more prevalent in pure DCIS (Z = 2.7, p = 0.007) and PD1, which was more dense in DCIS associated with IBC (Z = 2.2, p = 0.025).