ERBB2 and gastric cancer: Treatment of NCI-N87 gastric cancer cells with 25 μM of the active form of lovastatin for 4 h significantly enhanced the formation of HER2–HER2 homodimers (1.7 ± 0.3, n = 3) and HER2–EGFR heterodimers (2.0 ± 0.3, n = 3) in NCI-N87 gastric cancer cells (Fig. 1A).