In the intent-to-treat ( ITT ) population one year of tamoxifen improved the disease-free-survival ( DFS ) ( hazard ratio ( HR ) = @ ; @ % confidence interval ( CI ) @-@ @ ) , the Breast Cancer Recurrence Rate ( BCRR ) ( HR = @ ; @-@ @ ) and reduced the breast-cancer-specific-mortality ( BCM ) ( HR = @ ; @-@ @ ) .