Cost Plus Drugs founder Mark Cuban (Center) speaks at the annual Forbes Healthcare Summit Thursday, December 4th in New York with Humana chief executive officer Jim Rechtin (right) and Bruce Japsen, Forbes Senior healthcare contributor.Jamel ToppinHumana, one of the nation’s largest health insurers for older adults, and Mark Cuban’s Cost Plus Drugs are discussing ways to partner to lower the cost of prescription drugs for U.S. employers.The potential for such a partnership was disclosed Thursday at the annu ...