June 1, 2015

/C O R R E C T I O N — Northwest Biotherapeutics, Inc./

In the news release, NW Bio Announces Data to Date From DCVax®-Direct Phase I Trial, issued 01-Jun-2015 by Northwest Biotherapeutics, Inc. over PR Newswire, we are advised by the organization that the website link in the 6th paragraph should read nwbio.com/webcast. The complete, corrected release follows:

NW Bio Announces Data to Date From DCVax®-Direct Phase I Trial

86% of Phase I patients treated with preferred method still alive

BETHESDA, Md., June 1, 2015 /PRNewswire/ -- Northwest Biotherapeutics (NASDAQ: NWBO) ("NW Bio"), a U.S. biotechnology company developing DCVax® personalized immune therapies for solid tumor cancers, over the weekend in Chicago released promising new data on their Phase I trial of DCVax-Direct for direct injection into all types of inoperable solid tumors.

The patients enrolled in the trial had late stage cancers, with an average of three inoperable tumors. The patients had failed multiple prior therapies and had a poor prognosis.

The trial enrolled 40 patients, and 39 were evaluable. A conservative treatment regimen was used. Although the patients had multiple inoperable tumors, only 1 tumor was injected with DCVax-Direct. The treatments included only 3 injections in the first 2 weeks (Day 0, 7 and 14), and up to 3 additional injections spaced months apart thereafter (Weeks 8, 16 and 32), over a total period of 8 months.

Patients typically received their first injection about 1-1/2 months after recruitment. Four patients are still in the process of completing the study visits, and data collection is ongoing on all of the patients.

The trial tested three different dose levels of DCVax-Direct, two different methods of activating the dendritic cells that comprise DCVax-Direct, and a dozen different cancers. Findings to date include encouraging survival data and substantial induction of immune checkpoint expression (PDL-1).

The webcast and presentation by Dr. Bosch can be found on the Company's website at nwbio.com/webcast

Findings to date include the following:

    --  27 of 39 patients are still alive at up to 18 months after first
        injection.
    --  Patient survival correlates with the method of dendritic cell activation
        used. With the preferred method, 18 of 21 patients are still alive.
    --  Treatment effects have been observed in diverse cancers, including lung,
        breast, colorectal, pancreatic, sarcoma, melanoma, neuro-endocrine and
        other cancers.
    --  Patient survival correlates with the number of DCVax-Direct injections.
    --  Patient survival also correlates with stabilization of disease at Week 8
        (4th injection visit).  Among patients treated with the preferred method
        of dendritic cell activation, 16 of 19 achieved stable disease (i.e.,
        less than 25% increase in tumor size from baseline) at Week 8.

Findings to date relating to immunological responses include the following:

    --  Induction of PDL-1 immune checkpoint expression was seen in 64% of
        evaluable patients (14 of 22) following DCVax-Direct treatment. This
        suggests that the tumors are putting up defenses against the immune
        responses induced by DCVax-Direct, and marks these patients as potential
        candidates for treatment with checkpoint inhibitor therapies.
    --  An increase in T-cell infiltration into tumors, by functionally active
        T-cells, was seen following DCVax-Direct treatment.
    --  Both local effects (in the injected tumor) and systemic effects were
        observed.

Based on the findings from the Phase I trial, the Company plans to enhance its Phase II trials in several ways, including by:

    --  Using only the preferred activation method of the DCVax dendritic cells.
    --  Injecting multiple inoperable tumors at each treatment visit, not just
        one.
    --  Providing more frequent treatments and a larger total number of
        treatments.

The Company plans to pursue Phase II trials in non-small cell lung cancer and sarcoma, as well as a Phase II trial for multiple diverse types of cancers similar to the Phase I study. The Company also plans to expand the trial sites to include countries beyond the U.S.

"We are quite encouraged to see these results across diverse types of cancers, in late stage patients with multiple inoperable tumors who have exhausted other treatment options, and with quite a conservative DCVax-Direct treatment regimen," commented Linda Powers, CEO of NW Bio. "We are looking forward to proceeding with Phase II trials applying the lessons learned from this informative Phase I trial."

About Northwest Biotherapeutics

Northwest Biotherapeutics is a biotechnology company focused on developing immunotherapy products to treat cancers more effectively than current treatments, without toxicities of the kind associated with chemotherapies, and on a cost-effective basis, in both the U.S. and Europe. The Company has a broad platform technology for DCVax® dendritic cell-based vaccines. The Company's lead program is a 348-patient Phase III trial in newly diagnosed Glioblastoma multiforme (GBM). GBM is the most aggressive and lethal form of brain cancer, and is an "orphan disease." The Company is under way with a 60-patient Phase I/II trial with DCVax-Direct for all inoperable solid tumor cancers. It has completed enrollment in the Phase I portion of the trial. The Company previously received clearance from the FDA for a 612-patient Phase III trial in prostate cancer. The Company conducted a Phase I/II trial with DCVax for metastatic ovarian cancer together with the University of Pennsylvania. In Germany, the Company has also received approval of a 5-year Hospital Exemption for the treatment of all glioma (brain cancer) patients outside the clinical trial.

Disclaimer

Statements made in this news release that are not historical facts, including statements concerning future treatment of patients using DCVax and future clinical trials, are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Words such as "expect," "believe," "intend," "design," "plan," "continue," "may," "will," "anticipate," and similar expressions are intended to identify forward-looking statements. Actual results may differ materially from those projected in any forward-looking statement. Specifically, there are a number of important factors that could cause actual results to differ materially from those anticipated, such as risks related to the Company's ongoing ability to raise additional capital, risks related to the Company's ability to enroll patients in its clinical trials and complete the trials on a timely basis, uncertainties about the clinical trials process, uncertainties about the timely performance of third parties, risks related to whether the Company's products will demonstrate safety and efficacy, risks related to the Company's and Cognate's abilities to carry out the intended manufacturing expansions contemplated in the Cognate Agreements, risks related to the Company's ability to carry out the Hospital Exemption program and risks related to possible reimbursement and pricing. Additional information on these and other factors, including Risk Factors, which could affect the Company's results, is included in its Securities and Exchange Commission ("SEC") filings. Finally, there may be other factors not mentioned above or included in the Company's SEC filings that may cause actual results to differ materially from those projected in any forward-looking statement. You should not place undue reliance on any forward-looking statements. The Company assumes no obligation to update any forward-looking statements as a result of new information, future events or developments, except as required by securities laws.

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SOURCE Northwest Biotherapeutics, Inc.