Trial Shows Durable Disease Control, Tolerability In Advanced Melanoma Patients

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IDM Pharma announced updated results from a Phase 2 UVIDEM (IDD-3) melanoma vaccine clinical trial (DC-MEL-202).

The updated results showed that the investigational agent UVIDEM showed evidence of clinical activity and induction of immune response and was well tolerated in patients with advanced melanoma.

The data are being presented during a poster session at the International Society for Biological Therapy of Cancer (iSBTc) annual meeting today in Boston.

"There is a distinct need in the medical community for new treatments for metastatic melanoma," said Dr. Antoni Ribas, associate professor of medicine and surgery at UCLA and associate director of tumor immunology at the Jonsson Comprehensive Cancer Center. "The early analysis of data from the Phase 2 clinical trial with IDM Pharma's cancer vaccine, UVIDEM, has demonstrated that a small portion of patients is able to gain control of their disease through stimulating their bodies' natural defenses -- their immune system cells, and they were able to do so with minimal side effects."

Study design and findings

DC-MEL-202 is a single arm, two-stage Phase 2 trial designed to evaluate clinical and immunological activities and the incidence and severity of adverse events of a multivalent dendritic cell-based vaccine (UVIDEM) in patients with in-transit or low volume metastatic melanoma. Thirty-three patients were treated in the study and the results to date are as follows:

-- Clinical response (RECIST): out of the 33 patients treated, 9 (30%) showed evidence of clinical benefit (1 complete response (CR), 2 partial responses (PR) and 6 stable disease (SD)) with duration of response ranging from 7.2 to 29.7 months.

o To date, none of the patients who had an objective response by RECIST have relapsed.

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o The survival rate at 12 months is 67% and 18 patients are still alive

o Progression Free Survival (PFS) from apheresis is 4.8 months (95% CI, 3.94-5.72).

-- Assessment of pathological response in 2 patients (1 PR, 1 SD) showed no residual melanoma.

-- Immune response: 18 out of 29 evaluated patients (62%) showed a significant increase in TAA-specific cytokine-producing cells.

o The most frequently recognized antigens after vaccination with UVIDEM were gp100 and MAGE.

-- UVIDEM was well tolerated with only one possibly related serious adverse event (SAE) reported (age-related macular degeneration).

"The available results of this trial are very encouraging given the difficult-to-treat patient population," said Timothy P. Walbert, president and chief executive officer, IDM Pharma, Inc. "We are confident in the potential of this product to fulfill the unmet medical need and look forward to the completion of our Phase 2 program as well as the initiation of the Phase 3 program."

UVIDEM is a therapeutic specific immunostimulant developed by IDM Pharma in partnership with sanofi-aventis. IDM Pharma is responsible for the clinical development, regulatory and manufacturing activities for UVIDEM. Sanofi-aventis has worldwide marketing rights to UVIDEM in melanoma. UVIDEM consists of mature dendritic cells loaded with lysates from melanoma tumor cell lines. UVIDEM is produced in IDM Pharma cGMP manufacturing facilities in Irvine, California and in Paris, France.

UVIDEM has been administered to 143 patients in clinical development. Completion of patient enrollment in two Phase 2 clinical trials was previously announced. Thirty-eight patients with malignant melanoma were included in the U.S. Phase 2 study and 53 patients with resected stage II/III melanoma were included in the European randomized Phase 2 study. IDM Pharma plans on initiating a final Phase 2 trial in 82 melanoma patients with M1a or M1b stage disease and/or in transit lesions in the fourth quarter of 2007.

By IDM Pharma, Inc.

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