ERBB2 and neoplasm: To analyze the effect of interfering substances on the H2T signal, two tumor samples positive for HER2 878/1006/496: 1006—high HER2; 272/31274B2/884: 31274B2—low HER2) were re-embedded with potential interfering substances from normal stroma tissue (496 and 884) and normal fat tissue (878 and 272).