Any unused or expired vaccine remaining after a subject has completed vaccine treatment, should be returned to Agenus Inc. according to the following instructions. 2. Please contact the Agenus Team at BTTC17C0034@agenusbio.com in advance (i.e., minimum of 1 day) to inform Agenus when you plan to return unused or expired vaccine. Also copy nci_bttc@mail.nih.gov on this return request communication. 3. Agenus will provide a pre-paid courier air-way bill via email for this shipment to your site. 4. Use the qualified HSPPC-96 shipping kit that was received with the original shipment of vaccine from Agenus. The shipping kit should have the following materials, which came as part of the vaccine shipment from Agenus: Outer cardboard shipping box. Insulated liner and foam plug.