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Spectrum of magnetic resonance (MR)–based response patterns of hormone receptor–positive ductal carcinoma in situ to preoperative letrozole therapy. Patients exhibited variable patterns at baseline and at 3- and 6-month MR imaging timepoints. The predominant radiographic patterns were (A) no response (17.9% at 6 months), (B) partial response (49.2% at 6 months), or (C) complete response to therapy (32.8% at 6 months).
