Where plaintiff could not show that but for his cancer he would not have been terminated, a district court judge did not err in granting summary judgment to employer.The 7th U.S. Circuit Court of Appeals affirmed a decision by Chief Judge Theresa L. Springmann, Northern District of Indiana.Carl Castetter underwent treatment for various forms of cancer during his employment with Dollar General. After returning from medical leave Castetter applied, but was not hired, for a position as a district manager. Three months later …