ERA is endometrial receptivity analysis. It's a genetic test that tests a small sample of women's uterine tissue to assess whether the condition of women's endometrium is ready for transplantation.

Circulating tumor cell( CTC) which refers to the tumor cells that come out of the primary focus and invade the blood circulation. CTC can evade the body's immunity and stay in the primary or distant organs, thus forming recurrence and metastasis.