Avoid freezing and thawing of the emulsified product. SELLAS Life Sciences Group Galinpepimut -S Protocol : SLS17 -201/MK3475 -770 Protocol v1.1 (Amendment 1.0) 12 April 2019 Page 167 Sargramostim (GM-CSF) will be provided in lyophilized form as a 250-µg sterile, white, preservative-free powder that requires recons titution with sterile water for injection. It should be stored at 2°C to 8°C. For this study, the vial of GM-CSF is intended for single-use only. Pembrolizumab will be provided by the sponsor as summarized in Table 7. Table 7 Pembrolizumab Product Description Product Name & Potency Dosage Form MK-3475 100 mg/ 4 mL Solution for Injection These supplies will be shipped by the Sponsor indirectly via their Drug Supply packaging, distribution, and logistics vendor (Sharp Clinical Services, Phoenixville, PA, USA) to investigative sites in the appropriate packaging to maintain their recommended temperatures. The supplies are to be stored in their original cartons at the recommended temperatures until ready for use.