Lorvotuzumab mertansine, a single agent experimental drug to treat small-cell lung cancer (SCLC) is currently undergoing human studies.
Developed by ImmunoGen, Inc., lorvotuzumab mertansine is an investigational agent designed to kill cancer cells that express CD56, a protein. It consists of a CD56-binding antibody, lorvotuzumab, with a potent cancer-cell killing agent, DM1, attached using an engineered linker. The compound utilizes ImmunoGen’s Targeted Antibody Payload (TAP) technology.
“Lorvotuzumab mertansine has shown encouraging initial activity and tolerability when used as a single agent to treat relapsed SCLC, a very difficult cancer,” commented Daniel Junius, president and CEO. “We believe this product candidate has the potential to make a real difference for patients with SCLC, and we’re planning to start a trial later this year that assesses the compound, used together with standard care, for first-line treatment of this cancer,” he stated in a press release.
ImmunoGen is currently enrolling patients in the second phase of clinical trial, in which lorvotuzumab mertansine is administered at its maximum tolerated dose. This part focuses on SCLC, Merkel cell carcinoma (MCC) and ovarian cancer.
CD56 is expressed on SCLC, Merkel cell carcinoma, ovarian cancer, carcinoid and other solid tumors of neuroendocrine origin, and lorvotuzumab mertansine is in early clinical testing for the treatment of SCLC, Merkel cell carcinoma and ovarian cancer. CD56 also is expressed on multiple myeloma and certain other hematological malignancies. The compound is in early clinical testing for the treatment of CD56+ multiple myeloma, both when used as a single agent and as part of a combination regimen.
The US Food and Drug Administration (FDA) has granted orphan drug designation to lorvotuzumab mertansine (formerly IMGN901) product candidate when used for the treatment of small-cell lung cancer (SCLC).
ImmunoGen has also received a positive opinion for lorvotuzumab mertansine as an orphan medicinal product for the treatment of SCLC from the European Medicines Agency (EMA) Committee for Orphan Medicinal Products (COMP) and is awaiting final designation from the European Commission. The compound previously was granted orphan drug designation for the treatment of Merkel cell carcinoma in both the US and European Union (EU).
In the US, the Orphan Drug Act is intended to encourage companies to develop therapies for the treatment of diseases that affect fewer than 200,000 people in this country. Orphan drug designation provides ImmunoGen with seven years of market exclusivity that begins once lorvotuzumab mertansine receives FDA marketing approval for the treatment of SCLC. It also provides certain financial incentives that can help support the development of the compound for this indication.
Similarly, in the EU, orphan medicinal product designation is intended to encourage companies to develop therapies for life-threatening or chronically debilitating conditions that affect no more than five in 10,000 people in the EU. Orphan medicinal product designation provides ImmunoGen with ten years of market exclusivity that begins once lorvotuzumab mertansine receives European approval for SCLC. It also enables access to certain financial incentives as well as to protocol assistance.
ImmunoGen, Inc. develops targeted anticancer therapeutics using its TAP technology uses engineered antibodies to deliver one of ImmunoGen’s proprietary cancer-cell killing agents specifically to tumor targets. In addition to the Company’s product pipeline, compounds are in clinical testing through ImmunoGen’s collaborations with Genentech (a member of the Roche Group), sanofi-aventis, Biogen Idec and Biotest. A marketing application for the most advanced compound using ImmunoGen’s TAP technology, T-DM1, was submitted to the US FDA by Genentech in July 2010. Other ImmunoGen collaborative partners include Bayer Schering Pharma AG and Amgen.