Angelina Jolie has done many notable things of influence in her lifetime. Being an ambassador for the UN, winning an Academy Award and adopting three adorable children are definitely up there on her list of enviable achievements. None of these though, have had as much of an influence as her decision to undergo a risk-reducing double mastectomy in May 2013. An Australian study has confirmed that the number of women who have undergone a risk reducing mastectomy (RRM) has doubled since the star's announcement, coining what is now being called 'The Angelina Jolie Effect'.

Published in the Health Services Research journal, the study saw an analysis of hospital data from New York State and NSW between 2004 and 2014. In total, 1,808 and 487 women aged between 16 and 80 years-old underwent RRM in New York and NSW, respectively.

The study showed that prior to Jolie's announcement there were an average of 3.3 bimonthly RRM treatments per one million women in New York. Just 20 months after the star's announcement, this number rose to an average of 6.3 bimonthly cases per one million women. The results in NSW were very similar to this also.

If a woman has a strong family history of breast cancer and carries the BRCA2 gene mutilation, she is classified at high risk of developing breast cancer. In these cases, prevention is one of the best forms of treatment. 

The ‘Angelina Jolie’ effect confirmed in Australian study