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Xenetic Biosciences Announces Ongoing Safety and Efficacy Data From Phase 2 Trial of ErepoXen(R)

LEXINGTON, MA -- (Marketwired) -- 08/11/14 -- Xenetic Biosciences, Inc. (OTCBB: XBIO), a biopharmaceutical company focused on developing next-generation biologic drugs and novel oncology therapeutics, announces results from its ongoing data analysis of its Phase 2 ErepoXen® clinical trial being conducted in Australia and New Zealand.

This is a sequential multiple-dose study evaluating the safety and efficacy of subcutaneously administered ErepoXen® (PSA-EPO, a polysialylated erythropoietin), for the treatment of anemia in Chronic Kidney Disease (CKD) patients who are neither on dialysis nor receiving erythropoiesis stimulating agents.

We now report on the results of the first cohort of 12 patients who have all completed treatment with ErepoXen® at the lowest dose level. All enrolled patients in the cohort completed the trial and ErepoXen® was found to be safe and well tolerated with no drug-related serious adverse events. Even at the lowest dose levels being administered twenty five percent (25%) of the cohort's patients reached the target 10-12 g/dL hemoglobin levels.

This open-label, sequential multiple dose finding study is designed to determine the dose of ErepoXen® that is safe and moves the patient's hemoglobin level into the 10-12 g/dL range. No serious adverse events were reported in the 12 patients evaluated. Gastrointestinal disorders and infections of mild to moderate intensity were the most common events and were reported by 4 patients. None of the events were assessed as being related to the study drug. In addition, there was no indication of antibody formation against polysialic acid (PSA), EPO or PSA-EPO in any of the subjects tested to date. These are the first data on repeat dosing of PSA-EPO in human subjects demonstrating its tolerability, safety and efficacy in Western clinical trials. The second cohort on a higher dose level is currently being administered ErepoXen®.

On the basis of this data, a review carried out in July resulted in the Safety Review Committee authorizing a dose increase for the third cohort of the study, which is scheduled to start in September. The Safety Review Committee intends to meet again in Q4 of 2014, and the Company expects to announce further trial results shortly thereafter.

"These results are very encouraging and are in agreement with the data from the other 96 subjects that have already been administered ErepoXen® during trials in India. We are delighted that ErepoXen® is performing well in this pivotal Western clinical trial. This new efficacy data demonstrates that we have a drug that could well allow the Company to make a major impact on the $7Bn global anemia market," said Scott Maguire, Chief Executive Officer of Xenetic. "We look forward to receiving the data on the additional cohorts at higher dose ranges to hopefully confirm the therapeutic value of ErepoXen®. We plan to seek a commercial partner with the resources to bring this large market drug candidate through late-stage clinical development and potential market launch."

ErepoXen®
ErepoXen® is an improved, polysialylated form of erythropoietin (EPO), a hormone produced by the kidneys to maintain red blood cell production and prevent anemia. ErepoXen® is designed to reduce the required frequency of dosage and side effects, and to be less immunogenic than existing treatments.

About Xenetic Biosciences
Xenetic Biosciences is a biopharmaceutical company developing next-generation biologic drugs and novel oncology therapeutics. Xenetic's proprietary drug technology platforms include PolyXen® for creating next generation biologic drugs by extending the efficacy, safety and half-life of biologic drugs and OncoHist® for the development of novel oncology drugs focused on orphan indications. Xenetic's lead product candidates include ErepoXen®, an improved, polysialylated form of erythropoietin (EPO) for the treatment of anemia in pre-dialysis patients with chronic kidney disease and OncoHist®, a recombinant human histone H1.3 molecule which Xenetic is developing for the treatment of refractory Acute Myeloid Leukemia (AML). Xenetic is developing a novel series of polysialylated blood coagulation factors through its license agreement with Baxter International Inc. Xenetic is also developing a broad pipeline of clinical candidates for next generation biologics and novel oncology therapeutics in a number of orphan disease indications. For more information, please visit the company's website at www.xeneticbio.com.

Forward-Looking Statements

This release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995, including but not limited to, the potential safety, tolerability and efficacy of our product candidates and the advancement of our clinical trials. Forward-looking statements can be identified by terminology such as "anticipate," "believe," "could," "could increase the likelihood," "estimate," "expect," "intend," "is planned," "may," "should," "will," "will enable," "would be expected," "look forward," "may provide," "would" or similar terms, variations of such terms or the negative of those terms. Any forward-looking statements in this press release are based on management's current expectations of future events and are subject to a number of risks and uncertainties that could cause actual results to differ materially and adversely from those set forth in or implied by such forward-looking statements. These risks and uncertainties include, but are not limited to, the risk of cessation or delay of any of the ongoing or planned clinical trials and/or our development of our product candidates, the risk that the results of previously conducted studies involving similar product candidates will not be repeated or observed in ongoing or future studies involving current product candidates, the risk that our collaboration with Baxter will not continue or will not be successful, and the risk that any one or more of our product candidates will not be successfully developed and commercialized. For a discussion of other risks and uncertainties, and other important factors, any of which could cause our actual results to differ from those contained in the forward-looking statements, see the section entitled "Risk Factors" in our Annual Report on Form 10-K, as well as discussions of potential risks, uncertainties, and other important factors in our subsequent filings with the Securities and Exchange Commission. All information in this press release is as of the date of the release, and Xenetic undertakes no duty to update this information unless required by law.

Contact:
Xenetic Biosciences Inc.
www.xeneticbio.com
M. Scott Maguire
Chief Executive Officer
781 778 7720
Email Contact

US Contact
Adam S. Holdsworth
ProActive Capital
646-862-4607
Email Contact

UK/European contact:
Walbrook PR
Mike Wort
+44 (0)20 7933 8780
Email Contact

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