Hemispherx Biopharma's Ampligen(R) Tested in Combination With Experimental Vaccine From Leading Cancer Research Institute PHILADELPHIA, June 21, 2011 (GLOBE NEWSWIRE) -- Hemispherx Biopharma, Inc. (NYSE Amex:HEB) (the "Company" or "Hemispherx") today announced that it has entered into a Material Transfer and Research...