Cigna's Express Scripts filed a lawsuit Tuesday challenging a federal report that places the blame for rising drug prices on pharmacy benefit managers, describing it as "seventy-four pages of unsupported innuendo" and calling for a retraction.

Express Scripts, one of the country’s largest pharmacy benefit managers, sued the Federal Trade Commission (FTC) Tuesday and demanded the agency retract a report saying the industry middlemen

Pharmacy benefit manager Express Scripts sued the U.S. Federal Trade Commission on Tuesday over the regulator's recent drug pricing report, calling the report's conclusion that the prescription middlemen raise drug costs defamatory.