AdvertisementTest of Herceptin Finds Briefer Treatment Can Work, With Fewer Side EffectsMay 16, 2018Richard HarrisfacebookEmailHerceptin has proved to be effective in prolonging the lives of the 12 percent of women with breast cancer whose malignancy hasn't spread to other organs, and whose cancer is HER2-positive. But side effects can be a problem. (Getty Images)