Much of the work carried out by DTT is in support of the National Toxicology Program (NTP), an interagency partnership of the Food and Drug Administration, National Institute for Occupational Safety and Health, and NIEHS.

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Occasional sarcomas metastasize to the liver or, alternatively, originate there but have insufficient characteristics to permit a definitive diagnosis from H&E-stained slides. These are usually documented as sarcoma, NOS.

A discrete sarcoma of undetermined cell type is present in the liver.

Another example of sarcoma, NOS.