RecruitingEarly Phase 1Biological interventionEvaluating Safety, Tolerability, and Preliminary Efficacy of YSCH-01 Monotherapy and in Combination With Atezolizumab for Recurrent GlioblastomaThe clinical study of YSCH-01 will adopt an open-label, randomized design, with a planned enrollment of 10 participants with recurrent glioblastoma. Participants will be randomly allocated to the YSCH-01 monotherapy cohort or the YSCH-01 + Atezolizumab combination cohort, with 5 participants in each cohort. The study consists of the following three phases: screening phase, treatment phase, and follow-up phase. The primary endpoint is the 1-year survival rate of participants