In its first sentence, the New England Journal article makes one wonder why we needed more data. The authors note that angioplasty "has become common" even though "treatment guidelines advocate an initial approach with intensive medical therapy, a reduction of risk factors, and lifestyle intervention." In other words, we already know better than to use angioplasty for prevention. Making the case against the procedure yet again, the study found that after five years, invasive treatment of blockages didn't lessen chest pain or the risks of death, stroke, and heart attacks.