PTPRC and inclusion body myositis: The extent of cellular infiltrates showed a wide range with 6 to 117 CD45 positive cells per HPF in the HIV-IBM group and 19 to 86 in the sIBM group, with predominantly more cytotoxic T-cells and a median number of 34 CD8+ cells per HPF (7–104 cells) in the HIV-IBM group and 43 (18–83 cells) in the sIBM group (Fig. 1 b).