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Royal jelly exhibited anti tumor activity in experimental mouse leukemias, and antiangiogenesis activity has also been demonstrated in vitro.  In human cervico/uterine carcinoma cells, some royal jelly fractions actively inhibited tumor growth and some did not.  

One study found that royal jelly inhibited the growth-promoting effect of bisphenol on breast cancer MCF-7 cell lines, although another study showed that royal jelly enhanced MCF-7 proliferation.