ERBB4 and cancer: These include unique cancer patient samples harboring EGFR E709K (n = 67), EGFR E928K (n = 1), ERBB2 E717K (n = 10), ERBB3 E925K (n = 7), ERBB4 E715K (n = 8), and ERBB4 E934K (n = 5) variants.