Computational Morphological Assessment of Bladder Cancer Tissue Is Prognostic of Recurrence and Overall Survival Following Transurethral Resection.

PURPOSE

Current risk assessment tools for bladder cancer following transurethral resection of the bladder tumor (TURBT) depend on pathological examination of resected tissue, with the consequent intra- and inter-reviewer variability. Improved prognostic tools could enable increased monitoring and aggressive interventions for high-risk patients while reducing the frequency of invasive testing for low-risk patients.

METHODS

We present an automated tumor risk assessment method based on quantitative features of nuclear pleomorphism and polarity extracted from digitized hematoxylin and eosin slides and compared this model with pathologist grading. Our model, incorporating six features, was trained to estimate overall survival risk on n = 189 patients and validated for recurrence prognosis on an independent validation set of n = 151 patients.

RESULTS

The model had an accuracy of 0.73 (95% CI, 0.66 to 0.81) in identifying patients who would have recurrence within 5 years of surgery. Within the validation set was a consensus set of patients (n = 94) on which three pathologists independently assigned the same grade and a nonconsensus set (n = 57) where they did not. The model had similar performance in the consensus and nonconsensus set, with accuracies of 0.70 (95% CI, 0.61 to 0.80) and 0.78 (95% CI, 0.67 to 0.89), respectively, and was able to recapitulate pathologist scoring on the consensus set (accuracy = 0.76).

CONCLUSION

The results of this study suggest the need to incorporate both computerized analysis and pathologist grading into post-TURBT treatment planning.