CD8A and neoplasm: The masthigh cluster was characterised by high levels of mast cells, low levels of CD8+ T cells and was enriched for low‐grade tumours (Fédération Nationale des Centres de Lutte Contre le Cancer (FNCLCC)‐grade 1), while the CD8high and M2high groups had higher relative abundances of high‐grade tumours (FNCLCC‐grade 2 and 3) (Figures 1B and S1F).