Long-Term Phase I and Phase I/II Trial Data Continue to Show Striking Improvement in Survival of Brain Cancer Patients Who Receive DCVa...( BETHESDA Md. Sept. 11 /- Northwes...),Health

BETHESDA, Md., Sept. 11 /PRNewswire-FirstCall/ -- Northwest Biotherapeutics, Inc. (OTC Bulletin Board: NWBO; AIM: NWBT and NWBS) ("NWBT" or the "Company") today announced the most recent long-term follow-up data, through June 15, 2008, from its prior Phase I and Phase I/II clinical trials with DCVax(R)-Brain, which began in 2000 and 2003, for patients with Glioblastoma multiforme, the most lethal type of brain cancer. This long-term data shows that 84% of patients who received DCVax(R)-Brain in these trials have so far lived longer than the median survival of 14.6 months under standard of care, 68% of the patients have so far lived more than 2 years, 58% of the patients have so far lived more than 2-1/2 years, 42% have so far lived more than 3 years, and 26% have so far lived more than 4 years, with patients surviving as long as 8 years to date. The median survival in the patients from these trials is now 36.4 months, under a standard Kaplan Meier analysis.

DCVax(R)-Brain is a groundbreaking personalized vaccine that takes a patient's own immune cells and trains them in the laboratory to attack the biomarkers from that patient's own tumor cells. The 10-day manufacturing process produces several years of personalized vaccine for a patient, making DCVax(R)-Brain an "off-the-shelf" product for that patient throughout the treatment period. DCVax(R)-Brain is administered as a simple injection under the skin, similar to a flu shot, and is not toxic as chemotherapies are.

The most recent data provides an update for the period since December 31, 2007, concerning both disease progression and overall survival. During that period, only one of the nineteen patients experienced disease progression (at 59.5 months), and only one patient died (at 37.8 months).

The long term data from these clinical trials shows that more than 80% of the patients who received DCVax(R)-Brain showed a clinical response. In contrast, the typical response rates for cancer dr
'/>"/>