Marc Pfeffer, a cardiologist at Brigham & Women's Hospital in Boston, points to another factor that contributed to Zetia's rise: the often misplaced faith doctors have in improved lab test results. "When you have a lab value that reinforces your belief in a drug, you feel good about what you're doing," says Pfeffer. The lab test approach, he says, obscures the fact that what really matters is whether a drug prevents disease.
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