Whereas only a single G1 tumor contained more that 20% ErbB3-positive cells (1/27; 4%), 12% of the G2 tumors (35/299) and 19% of the G3 tumors (14/73) displayed medium-to-strong ErbB3 expression in more than 20% of the cells (Figure 7B). The gene discussed is ERBB3; the disease is neoplasm.