Depo Privera cancer causing?

I just wanted to comment on (pg 104) "Depo-privera...caused cancer in test animals". I looked up some facts about the "new" Depo-provera shot that most females have been given as an option for birth control. Basically the website says that "Depo-subQ Provera 104 contains 31 percent less hormone than the original Depo shot (104 mg of medroxyprogesterone acetate). Because it has a lower dose of progestin, it may lead to fewer progestin-related side effects" (about.com). It also warns about bone loss stating on the box ""Women who use Depo Provera may lose significant bone mineral density (BMD)." BMD measures how much calcium is stored in the bones. Using this method over time can result in a calcium loss, but calcium starts to return once this method is stopped."
 It seems strange to me though that no one ever mentions that it caused cancer in test animals. In our article Reproductive Rights that was listed as the reason they stopped using it on the Relf sisters. This was never something mentioned to me by my doctor. However after doing some research I found that it does increase the risk of cancer, specifically breast cancer. Lifenews.com states that "A new study of women using the Depo Provera birth control drug finds the risk of breast cancer is increased, according to information released today from the on Abortion/Breast Cancer.
The group notes a study of 1,028 women ages 20-44 in the April 15, 2012 issue of Cancer Research found that recent users of Depo Provera (DMPA)  for 12 months or more had a statistically significant 2.2-fold increased risk of developing invasive breast cancer."  I thought it was interesting and just wanted to share.