... noninvasive breastcancer avoided, nNo family history 1-2 2 2 -3 2 -3 Family history 2 -3 3- 4 4-5 5-6 22continuedChemoprevention of Breast Cancer 23 Variable2Women 45 Women 55 Women 65 Women 75Years ... 1.6Family history 1.6 2 .3 3.2 3. 4Benefits per 1,000 women over5 y of tamoxifen therapyCases of invasive breast canceravoided, nNo family history 3- 4 5-6 7-8 8Family history 8 1 1-1 2 16 17Cases ... likely to be as cost-effective as many other clinical preventive services- less than $30 ,000 per additional year of life gained.Reference1. Winawer SJ, Fletcher RH, Miller L, Godlee F, StolarMH,...