TGFB1 and neoplasm: Patients with low‐purity purity were more likely to be classified as C3 (elevated Th17 and Th1 genes, low to moderate tumor cell proliferation, and lower levels of aneuploidy and overall somatic copy number alterations) and C6 (highest TGF‐β signature and a high lymphocytic infiltrate with an even distribution of type I and type II T cells) subtypes (p < 0.05).