Date:6/5/2011

ss release remain subject to audit and confirmation procedures, and therefore the results may change materially and adversely after such procedures are completed; (vi) the data in this press release is not necessarily predictive of the outcome of the expansion arm of the Phase 2 study of NKTR-102 in patients with platinum resistant/refractory ovarian that have received prior treatment with PLD—therefore the results from this expanded Phase 2 study population could be materially and adversely different than the results described in this press release; (vii) additional important data will be reported by Nektar in the future regarding the Phase 2 NKTR-102 clinical study in ovarian cancer (including without limitation the expansion arm of the study) and therefore the future results from this ongoing Phase 2 ovarian cancer study may differ materially and adversely from the preliminary interim results presented in this press release; (viii) Nektar's patent applications for its proprietary or partner product candidates may not issue, patents that have issued may not be enforceable, or additional intellectual property licenses from third parties may be required in the future; (ix) the uncertain outcome of any future intellectual property, commercial or other litigation related to Nektar's proprietary product candidates, including without limitation NKTR-102; and (x) certain other important risks and uncertainties set forth in Nektar's Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, filed with the Securities and Exchange Commission on April 29, 2011.  Actual results could differ materially from the forward-looking statements contained in this press release.  Nektar undertakes no obligation to update forward-looking statements, including but not limited to any clinical, FDA or other regulatory information, whether as a result of new information, future events or otherwise.

Nektar Investor Inquiries:Jennifer Ruddock/Nekta
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