invasive bladder cancer (NMIBC) guideline, two classification systems for grade are
advocated: WHO1973 and WHO2004/2016. Objective To compare the prognostic value of
these WHO systems. Design, setting, and participants Individual patient data for 5145
primary Ta/T1 NMIBC patients from 17 centers were collected between 1990 and 2019. The
median follow-up was 3.9 yr. Outcome measurements and statistical analysis Univariate and …