KIF15 and breast cancer: Further study showed that multiple kinesins including above four kinesins plays important roles in the growth and survival of both tamoxifen-sensitive and resistant breast cancer cells and high levels of the four kinesins are strongly related to poor recurrence-free survival in patients treated with tamoxifen, suggesting that kinesins like KIF15 present crucial values in predicting prognosis and may be used as therapeutic targets for breast cancer [41].