The Supreme Court said on Monday that it would not review a case challenging patent settlements between major drugmakers and their generic rivals.

The case centers on a lawsuit challenging a settlement deal between Barr Pharmaceuticals Inc. and AstraZeneca involving the cancer drug tamoxifen.

The case has been closely watched because similar drug patent settlements between major drug makers and their generic rivals have come under the scrutiny of U.S. antitrust authorities and some lawmakers in Congress.