CD28 and congenital rubella syndrome: They reported that the lack of correlation between EASIX and CRS in this patient cohort was attributed to the limited rates of observed severe CRS (n = 2), the exclusive use of CD28 costimulatory-based CAR-T products, and the inclusion of a limited population with transformed indolent B-cell lymphomas, in addition to the relatively small sample size of the cohort [78].