When "Effective" Prevention Agents Fail to Elicit Anticipated Effects: Challenges in Trial Design.

142 Double-Blind, Randomized Trial of Alternative Letrozole Dosing Regimens in Postmenopausal Women with Increased Breast Cancer Risk Ana Maria López, Sandhya Pruthi, Judy C. Boughey, Marjorie Perloff, Chiu-Hsieh Hsu, Julie E. Lang, Michele Ley, Denise Frank, Josephine A. Taverna, and H-H. Sherry Chow 149 Relationship of Terminal Duct Lobular Unit Involution of the Breast with Area and Volume Mammographic Densities Gretchen L. Gierach, Deesha A. Patel, Ruth M. Pfeiffer, Jonine D. Figueroa, Laura Linville, Daphne Papathomas, Jason M. Johnson, Rachael E. Chicoine, Sally D. Herschorn, John A. Shepherd, Jeff Wang, Serghei Malkov, Pamela M. Vacek, Donald L. Weaver, Bo Fan, Amir Pasha Mahmoudzadeh, Maya Palakal, Jackie Xiang, Hannah Oh, Hisani N. Horne, Brian L. Sprague, Stephen M. Hewitt, Louise A. Brinton, and Mark E. Sherman