Long-Term Follow-Up of E3311, an ECOG-ACRIN Cancer Research Group Phase II Trial of Transoral Surgery and Risk-Based Adjuvant Treatment in Human Papillomavirus–Initiated Oropharynx Cancer In REACH3 ...
Because interim analysis may not address longer-term outcomes of interest, important clinical questions such as overall survival benefit—the ultimate test of efficacy to many—may remain unanswered.