With personalized medicine becoming a key focus for medical research and diagnostics, Partners HealthCare System, the region’s largest hospital and physicians network, has been quietly positioning itself to become a national leader in the emerging field. Starting next month, Partners will launch a “whole genome” sequencing and interpretation service for patients at its hospitals, including Massachusetts General and Brigham and Women’s in Boston. The service, which will cost about $9,000, is intended to help doctors and patients make critical decisions on therapies — for example, on which breast cancer drug could work best based on a patient’s genetic makeup.
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