TP53 and neoplasm: We investigated the expression of five p53 isoforms: fl-p53 (p53), p53β, p53γ, Δ40p53, and Δ133p53 (Fig. 2 and Fig. S1) in EC tumor (Ishikawa, RL95–2, AN3CA, and KLE) and nontumor cell lines (E6/E7/TERT and EM42), and determined their putative subcellular localization and presumed aggregation potential.