Letrozole, a new oral aromatase inhibitor for advanced breast cancer: double-blind randomized trial showing a dose effect and improved efficacy and tolerability compared with megestrol acetate.
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J Clin Oncol. 1998 Feb;16(2):453-61. doi: 10.1200/JCO.1998.16.2.453.
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PMID: 9469328
Clinical Trial.