The fetus will help the mother to prevent breast cancer

The study found that female breast cancer, the number of fetal cells in the body are far fewer women than breast cancer. In addition, there is no breast cancer in women, 56% of human memory in fetal cells, breast cancer in women only 26% of the human memory in fetal cells.

Researchers study also showed that injection of the vaccine, seems to increase the number of fetal cells in maternal. They said similar means, is also licensed for the treatment of breast cancer.

In women during pregnancy, some fetal cells through the placenta into the maternal blood, and after pregnancy persist in the mother's skin, liver, brain and spleen, a phenomenon known as microchimerism. Prior studies have shown that fetal cells can repair the tissue damage of the parent.

Researchers can not exactly explain why the fetal cells may contribute to maternal cancer. They said the fetal cells may be able to provide the parent with cancer cells of the immune surveillance, so that the mother's immune system to maintain a more "alert" status. In addition, is also possible that fetal cells are "foreign" cells that can more effectively identify and fight against cancer cells than the parent's own immune cells.

Some experts believe that the new study does not prove that fetal cells can directly destroy cancer cells, the conclusions still need the support of further research.