IDM Pharma, Inc. (IDMI)

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IDM Pharma Provides Update on Mifamurtide (MEPACT(R), L-MTP-PE) European Regulatory Status

Positive Opinion Formally Adopted by CHMP

IRVINE, Calif., Dec. 18 /PRNewswire-FirstCall/ -- IDM Pharma, Inc. (NASDAQ: IDMI) today announced that the Committee for Medicinal Products for Human Use (CHMP) formally adopted a positive opinion for mifamurtide (L-MTP- PE), known as MEPACT(R) in Europe, for the treatment of patients with non- metastatic, resectable osteosarcoma, a rare and often fatal bone tumor that typically affects children and young adults. The formal adoption of the positive opinion follows the CHMP recommendation previously announced in November. The marketing authorization is likely to be issued by the European Commission in Q1 2009.

Granting of the centralized marketing authorization will allow L-MTP-PE to be marketed in the 27 Member States of the European Union (EU), as well as in Iceland, Liechtenstein and Norway. L-MTP-PE would be the first approved new treatment in more than 20 years for patients with osteosarcoma. L-MTP-PE was granted orphan medicinal product status in Europe in 2004. Therefore, under European pharmaceutical legislation, L-MTP-PE is entitled to a period of 10 years market exclusivity in respect of the approved indication.

The Company is expected to implement a pharmacovigilance plan for MEPACT, as is normally required for all medicinal products, as part of the marketing authorization. Full details of the CHMP positive opinion, including safety information and the approved indication for MEPACT can be found at http://www.emea.europa.eu/htms/human/opinion/opinion.htm.

L-MTP-PE U.S. Regulatory Status

As previously announced, in the United States the Company continues to work with the Children's Oncology Group as well as external experts and advisors to gather patient follow up data from the Phase 3 clinical trial of L-MTP-PE and to respond to other questions in the non-approvable letter the Company received from the U.S. Food and Drug Administration (FDA). The Company expects to submit the amended New Drug Application (NDA) in the first quarter of 2009 given the recent focus on completing review activities for the Marketing Authorization Application (MAA) in the European Union.

L-MTP-PE was granted orphan drug status in the United States in 2001 and the NDA was submitted to FDA in October 2006 and was accepted for review in December 2006.

About Osteosarcoma

Between two and three percent of all childhood cancers are osteosarcoma. Because osteosarcoma usually develops from osteoblasts, it most commonly affects children and young adults experiencing their adolescent growth spurt. Boys and girls have a similar incidence rate until later in their adolescence, when boys are more commonly affected. While most tumors occur in larger bones, such as the femur, tibia, and humerus, and in the area of the bone that has the fastest growth rate, they can occur in any bone. The most common symptom is pain, but swelling and limited movement can occur as the tumor grows.

Osteosarcoma is an orphan disease with fewer than 1,000 new cases diagnosed in the United States each year. A similar incidence of the disease exists in Europe. According to the Children's Oncology Group, the survival of children with osteosarcoma has remained at 60-65 percent since the mid-1980s. The standard treatment for osteosarcoma is tumor resection with combination chemotherapy before and after surgery.

About IDM Pharma

IDM Pharma is focused on the development of innovative cancer products that either destroy cancer cells by activating the immune system or prevent tumor recurrence by triggering a specific adaptive immune response. IDM Pharma is dedicated to maximizing the full therapeutic and commercial potential of each of its innovative products to address the needs of patients and the physicians who treat these patients.

The Company believes it has adequate cash resources to support its operations into the first half of 2009 based on its current development and operating plans. The Company does not currently have operational sales and marketing infrastructure for L-MTP-PE and does not currently have plans or sufficient funds to secure this capability. The Company continues to evaluate strategic alternatives, which may include seeking strategic partners, a merger and/or the sale of all or part of its operations and assets, or raising additional capital to secure operational sales and marketing infrastructure for L-MTP-PE.

For more information about the company and its products, visit http://www.idm-pharma.com.