A drug used with other anticancer drugs to treat stage III or stage IV classical Hodgkin lymphoma that has not been treated with other therapy. Brentuximab vedotin is also used to treat certain types of Hodgkin lymphoma, anaplastic large cell lymphoma and mycosis fungoides that were treated with other therapy. It is also being studied in the treatment of other types of cancer. Brentuximab vedotin is made up of a monoclonal antibody linked to an anticancer drug. It binds to a protein called CD30, which is found on some lymphoma cells, and may kill cancer cells. Brentuximab vedotin is a type of antibody-drug conjugate. Also called Adcetris and SGN-35.