Second Quarter 2012 Earnings

Separately today, Dendreon released its earnings results for the second quarter ended June 30, 2012. The Company’s earnings release can be found under the investor relations section of the Company’s website at http://www.dendreon.com.

Dendreon will host a conference call this afternoon at 4:30 p.m. ET to discuss this announcement and its second quarter 2012 earnings results. Access to the discussion may be obtained as follows: Dial 1-877-548-9590 (domestic) or +1-720-545-0037 (international); conference pass code: 10564494. A webcast can be accessed at www.dendreon.com (homepage and investor relations section).

PROVENGE ® Indication and Important Safety Information

PROVENGE ® is an autologous cellular immunotherapy indicated for the treatment of asymptomatic or minimally symptomatic metastatic castrate resistant (hormone refractory) prostate cancer.

PROVENGE is intended solely for autologous use and is not routinely tested for transmissible infectious diseases.

The safety evaluation of PROVENGE was based on 601 prostate cancer patients in four randomized clinical trials who underwent at least one leukapheresis. The most common adverse events (incidence greater-than or equal to 15%) are chills, fatigue, fever, back pain, nausea, joint ache, and headache. Serious adverse events reported in the PROVENGE group include acute infusion reactions (occurring within 1 day of infusion) and cerebrovascular events. In controlled clinical trials, severe (Grade 3) acute infusion reactions were reported in 3.5% of patients in the PROVENGE group. Reactions included chills, fever, fatigue, asthenia, dyspnea, hypoxia, bronchospasm, dizziness, headache, hypertension, muscle ache, nausea, and vomiting. No Grade 4 or 5 acute infusion reactions were reported in patients in the PROVENGE group.

To fulfill a post marketing requirement and as a part of the company's ongoing commitment to patients, Dendreon will conduct a registry of approximately 1500 patients to further evaluate a small potential safety signal of cerebrovascular events. In four randomized clinical trials of PROVENGE in prostate cancer patients, cerebrovascular events were observed in 3.5% of patients in the PROVENGE group compared with 2.6% of patients in the control group.

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