Did Angelina Jolie Make a Mistake by Acting on the 'Breast Cancer Gene' Theory?

     In a word: yes.  Excerpt from the article at Green Med Info:
     ...given these facts, Jolie's decision conceals a dark side that she, like millions of other American women, are completely unaware of. For example, look at the soaring stock response of Myriad Genetics, the patent-holders of the human genes BRCA1/BRCA2, soon after Jolie's announcement in this Yahoo Finance article published today: Myriad Genetics Shares Climb After Angelina Jolie Has Mastectomy.
The Utah-based company, contrary to popular opinion, owns patents on your BRCA genes (men have them too). And not only that, as a recent Slate article explains:

[Myriad Genetics] claims to own the rights to any test for the presence of the two critical genes associated with breast cancer, and it has ruthlessly enforced that right, though their test is inferior to one that Yale University was willing to provide at much lower cost. The consequences have been tragic: Thorough, affordable testing that identifies high-risk patients saves lives. Blocking such testing costs lives. Myriad is a true example of an American corporation for which profit trumps all other values, including the value of human life itself.

      Given the fact that powerful, profit-driven corporations stand to reap profound financial benefit from the propagation of an oversimplified gene-driven theory of breast cancer susceptibility, we must be cautious in jumping on the mainstream media and medical bandwagon by viewing Jolie's increasingly popular decision uncritically.
     Read the article here.
     Also recommended: How Angelina Jolie Was Duped into Self-Mutilation