Scientists Know That the Oncogene ErB-2 Over Produces a Growth

Scientists know that the oncogene erB-2 over produces a growth factor and causes all breast cancers.

A) False. Unfortunately, this is the known cause of only about 30% of breast cancers.
B) True. And the drug herceptin stops it.
C) False. The oncogene erB-2 suppresses cell division.
D) True. erB-2 is the most commonly mutated gene in women.
E) False. Scientists don't yet know what causes any breast cancers.