The risk of developing breast cancer was similar between years @-@ ( @ -LSB- @ % -RSB- in @ women in the placebo group vs @ -LSB- @ % -RSB- in @ women in the tamoxifen group ; hazard ratio -LSB- HR -RSB- @ -LSB- @ % CI @-@ @ -RSB- , p = @ ) and after @ years ( @ -LSB- @ % -RSB- in @ women vs @ -LSB- @ % -RSB- in @ , respectively ; HR @ -LSB- @-@ @ -RSB- , p = @ ) .