<b><i>Objectives:</i></b> To prospectively evaluate the prognostic utility of the traditional prognostic factors and molecular markers p53 and Ki-67 in a homogeneous series of patients with non-muscle-invasive bladder cancer (NMIBC) treated with Bacillus Calmette-Guérin (BCG). <b><i>Patients and Methods:</i></b> 192 intermediate- and high-risk NMIBC cases were enrolled. The variables in study were age, stage, grade, focality, tumour size, presence of associated carcinoma in situ, recurrence rate before BCG, maintenance for BCG, Ki-67 and p53. The endpoints considered were recurrence-free survival, progression-free survival, cancer-specific survival (CSS) and overall survival (OS). <b><i>Results:</i></b> T stage resulted in being associated with CSS, whereas age with OS. BCG maintenance was a significantly favourable independent predictor of OS, CSS, recurrence and progression. In univariate analysis, the labelling index of Ki-67 was significantly associated with OS, CSS and progression. Multivariate analysis, however, confirmed this association only for OS. On the contrary, the labelling index of p53 was a significant predictor of recurrence, both in uni- and multivariate analyses, but with a HR inferior to 1. <b><i>Conclusions:</i></b> Ki-67 was an independent predictor of survival. p53 overexpression showed a significant yet inverse correlation with recurrence, thus showing little clinical utility. Age, stage and maintenance were confirmed as independent predictors of BCG response.