The SIOG 2026 Research Masterclass is an intensive, three-day course organized by the International Society of Geriatric Oncology (SIOG), running from April 8 to April 10, 2026. The event will be held at the Hilton St. Petersburg Bayfront in Tampa, Florida, U.S.. Its core focus is to equip early-career clinical investigators and other professionals with essential attributes for designing clinical studies that are centered on the currently under-represented older adult cancer population. The objective is to provide world-class training to address hidden inclusion criteria that often exclude older cancer patients from randomized control studies.