CD8A and pachyonychia congenita: Consensus clustering was utilized to classify PC samples into two HH signaling–related subtypes: HRGcluster A and HRGcluster B. In contrast with HRGcluster A, HRGcluster B has an earlier clinical stage, better outcome, less active level of HH signaling, higher infiltration level of CD8+ T cells and B cells, and a greater likelihood of benefiting from immunotherapy and gemcitabine chemotherapy.