cDC1 infiltration apparently improved prognosis in solid tumors, such as head and neck squamous cell carcinomas (HNSCC) , lung adenocarcinoma, melanoma, and triple-negative breast cancer (TNBC) (Bogunovic et al., 2009; Roberts et al., 2016; Barry et al., 2018; Böttcher et al., 2018). This evidence concerns the gene MPPE1 and head and neck squamous cell carcinoma.