They said they found that progesterone, which is involved in the female reproductive cycle, stimulates the proliferation of breast cells carrying a gene linked to breast cancer, possibly feeding tumor growth.

• 他们说他们发现黄体酮，这一参与妇女生殖周期的激素，刺激携带与乳癌有关的基因的乳腺细胞的增殖。