The U.S. Food and Drug Administration today approved a new use for Lymphoseek (technetium 99m tilmanocept) Injection, a radioactive diagnostic imaging agent used to help doctors determine the extent a type of cancer called squamous cell carcinoma has spread in the bodys head and neck region.

In 2013, Lymphoseek was approved to help identify lymph nodes closest to a primary tumor in patients with breast cancer or melanoma. Lymph nodes filter lymphatic fluid that flows from the bodys tissues. This fluid may contain cancer cells, especially if the fluid drains a part of the body containing a tumor. By surgically removing and examining the lymph nodes that drain a tumor, a procedure called a biopsy, doctors can sometimes determine if a cancer has spread.

With todays approval, Lymphoseek can now be used to guide testing of lymph nodes closest to a primary tumor for cancer, called a sentinel lymph node biopsy, in patients with cancer of the head and neck. This new indication will allow for the option of more limited lymph node surgery in patients with sentinel nodes negative for cancer.

For some patients with head and neck cancer, removal and pathological examination of lymph nodes draining a primary tumor is an important diagnostic evaluation, said Libero Marzella, M.D., Ph.D., director of the Division of Medical Imaging Products in the FDAs Center for Drug Evaluation and Research. To use Lymphoseek, doctors inject the drug into the tumor area and later, using a handheld radiation detector, find the sentinel lymph nodes that have taken up Lymphoseeks radioactivity.

For this new indication, Lymphoseeks safety and effectiveness were established in a clinical trial of 85 patients with squamous cell carcinoma of the lip, oral cavity, and skin. All patients were injected with Lymphoseek. Surgeons subsequently removed suspected lymph nodesthose identified by Lymphoseek and those based upon tumor location and surgical practicefor pathologic examination. Results showed that Lymphoseekguided sentinel lymph node biopsy accurately determined if the cancer had spread through the lymphatic system.

The most common side effects identified in clinical trial was pain or irritation at the injection site.

Lymphoseek is marketed by Navidea Biopharmaceuticals, Inc. based in Dublin, Ohio.

The FDA, an agency within the U.S. Department of Health and Human Services, protects the public health by assuring the safety, effectiveness, and security of human and veterinary drugs, vaccines and other biological products for human use, and medical devices. The agency also is responsible for the safety and security of our nations food supply, cosmetics, dietary supplements, products that give off electronic radiation, and for regulating tobacco products.

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