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Nektar Therapeutics, a clinical-stage biopharmaceutical company, engages in developing a pipeline of drug candidates that utilize its PEGylation and polymer conjugate technology platforms. Its product pipeline consists of drug candidates in various therapeutic areas, including oncology, pain, anti-infectives, and immunology. The company's drug candidates in clinical development stage comprise naloxegol, an opioid antagonist that is in Phase 3 clinical trail for the treatment of opioid-induced constipation; BAY41-6551 that has completed Phase 2 clinical trail to treat gram-negative pneumonias; NKTR-181, a mu-opioid analgesic molecule, which is in Phase 2 clinical trail for chronic pain; and NKTR-192 that is in Phase 1 to treat acute pain. Its other product candidates comprise etirinotecan pegol, a topoisomerase I inhibitor, which is in Phase 3 clinical trial for the treatment of metastatic breast cancer; in Phase 2 clinical trail for ovarian cancer and second-line metastatic colorectal cancer; and in combination with 5-fluorouracil/leucovorin to treat metastatic colorectal cancer that completed Phase I clinical trial. In addition, the company offers preclinical drug candidates comprising opioid/NKTR-118 for the treatment of chronic pain; NKTR-171 to treat neuropathic pain; and NKTR-214, a cytokine immunostimulatory therapy for the treatment of oncology. Nektar Therapeutics has collaboration with Bayer Healthcare LLC to develop BAY41-6551 (NKTR-061, Amikacin Inhale), which is an inhaled solution of amikacin, an aminoglycoside antibiotic; and a license agreement with AstraZeneca AB for the development and commercialization of Oral NKTR-118 and NKTR-119. Further, it has various license, manufacturing, and supply agreements for its technology with biotechnology and pharmaceutical companies, such as Affymax, Amgen, MAP Pharmaceuticals, Merck, Pfizer, Roche, and UCB Pharma. The company was founded in 1990 and is headquartered in San Francisco, California.