Bayer Mostly Avoids Lawsuit Over Mirena IUD Cancer Risk, For Now

A woman who says Bayer Healthcare Pharmaceuticals Inc. markets and sells its Mirena contraceptive despite the IUD’s known propensity for significantly increasing the risk of breast cancer must mostly try again with her claims.

But the US District Court for the Northern District of California denied Bayer’s motion to strike the nationwide and state law class allegations from Priya Sidhu’s March 14 lawsuit.

“There is a split in this District as to whether a motion to strike class action allegations may be entertained at the motion to dismiss stage,” Judge Beth Labson Freeman said Nov. 22. But because the ...