We believe that our antibodies have therapeutic potential, in some cases as a naked antibody or when conjugated with chemotherapeutics, cytokines or other toxins to create unique and potentially more effective treatment options. The attachment of effective anti-tumor compounds to antibodies is intended to allow the delivery of these therapeutic agents to tumor sites with better specificity than conventional chemotherapy. This treatment method is designed to optimize the therapeutic window through reducing the systemic exposure of the patient to the therapeutic agents, which ideally minimizes debilitating side effects while maximizing the concentration of the therapeutic agent at the tumor, potentially leading to better efficacy.

Our portfolio of investigational products includes antibody-drug conjugates (ADCs) that are designed to deliver a specific payload of a chemotherapeutic directly to the tumor while reducing overall toxicities that are usually associated with conventional administration of these chemotherapeutic agents. Our most advanced ADCs are sacituzumab govitecan (IMMU-132) and labetuzumab govitecan (IMMU-130), which are in advanced trials for a number of solid tumors. Sacituzumab govitecan is our lead product candidate and has received Breakthrough Therapy Designation from the FDA for the treatment of patients with metastatic triple-negative breast cancer (mTNBC) who have received at least two prior therapies for metastatic disease.

To accelerate the clinical and preclinical development of sacituzumab govitecan, we have entered into clinical collaborations with AstraZeneca to investigate the ADC in earlier lines of therapy for mTNBC, advanced urothelial cancer (UC) and metastatic non-small cell lung cancer in combination with its checkpoint inhibitor, and with Clovis to combine with its PARP inhibitor in mTNBC, advanced UC and ovarian cancer. We are also working with the University of Wisconsin on a clinical study in prostate cancer.

We also have a number of other product candidates that target solid tumors and hematologic malignancies, in various stages of clinical and preclinical development. They include other ADCs such as labetuzumab govitecan, which binds the CEACAM5 antigen expressed on colorectal cancer and other solid cancers, and IMMU-140 that targets HLA-DR for the potential treatment of hematologic malignancies.