By Maria Cendejas

According to new research presented at the 8th European Brest Cancer Conference in Vienna Austria, it's safe to become pregnant after being treated for breast cancer, abcnews reported.

The research was exact to women who were diagnosed with estrogen-receptor positive tumors, which have protein molecules that need estrogen to grow. According to the National Institutes of Health, 60% of all breast cancers are ER-positive.

Regardless of the fear that high hormone levels that occur during pregnancy might stimulate breast cancer growth, data overwhelming showed that it does not.

The study included 333 women ages 21-48 who became pregnant after a breast cancer diagnosis and 874 women with similar breast cancer diagnoses who didn’t become pregnant. Researchers found about 30% of all the women had a recurrence of the cancer after five years of pregnancy.

Some women who became pregnant were recommended to get an abortions because of the potential dangers of recurrence, but researchers said this recommendation might be unnecessary in most cases.

The study showed that there was no difference in recurrence among women who became pregnant and those who did not. Indeed, women who became pregnant within two years of their breast cancer diagnoses might have better "disease-free survival" than those who did not become pregnant at all. But researchers warned that this observational finding must be more rigorously researched before it's presented as a fact.

Dr. Hatem Azim, lead author of the study and medical oncologist at the Jules Bordet Institute in Brussels, said, "These messages are vital as women with ER+ disease were frequently advised against pregnancy for fear that pregnancy could stimulate the recurrence of the disease by means of hormonal stimulation. This is the first study ever to address the impact of pregnancy on breast cancer outcome in patients with this kind of breast cancer. It is also the first study to provide reliable information on the role of abortion and insights on the time to become pregnant after a breast cancer diagnosis.”