Of interest, TP53 mRNA expression differed among tumour grades (Bonferroni–Holm post hoc test G1 vs G2 P = 0.045; G1 vs G3 P < 0.001; G2 vs G3 P = 0.031) with the following expression means in G1 of 3.2434, in G2 of 3.6753 and in G3 of 4.0424. This evidence concerns the gene TP53 and neoplasm.