Originally dba Hybridon Inc., Idera Pharmaceuticals, Inc. is a biotechnology company developing DNA- and RNA-based drug candidates for treatment of infectious diseases, autoimmune and inflammatory diseases, cancer, and asthma and allergies, and for use as vaccine adjuvants. The company designs and creates proprietary Toll-Like Receptors (TLR) to modulate immune responses, including TLR agonist, a compound that stimulates an immune response through the targeted TLR; and TLR antagonist, a compound that blocks activation of an immune response through the targeted TLR. Its drug candidates include IMO-2125, a TLR9 agonist, which is in Phase 1 clinical trial for hepatitis C virus infection; and TLR7, 8, and 9 agonists that are in research stage for viral diseases. The company also develops IMO-3100, a dual TLR7/TLR9 antagonist, which is in preclinical development stage for autoimmune and inflammatory diseases, such as lupus, rheumatoid arthritis, multiple sclerosis, psoriasis, and colitis. In addition, its drug candidates also comprise TLR7 and TLR8 agonists that are in research stage for solid tumor cancers. The company has a licensing and collaboration agreement with Merck KGaA to research, develop, and commercialize TLR9 agonists for the treatment of cancer, excluding cancer vaccines; a license and research collaboration agreement with Merck & Co., Inc. to research, develop, and commercialize therapeutic and prophylactic vaccine products containing its TLR7, 8, and 9 agonists in the fields of cancer, infectious diseases, and Alzheimers disease; and a research collaboration and option agreement, and a license, development, and commercialization agreement with Novartis International Pharmaceutical, Ltd. to discover, develop, and commercialize TLR9 agonists for the treatment of asthma and allergies.