Absolute percentage of biopsied tissue positive for Gleason pattern 4 disease (APP4) appears predictive of disease control after high dose rate brachytherapy and external beam radiotherapy in intermediate risk prostate cancer. - Martell, K.; Mendez, L.C.; Chung, H.; Tseng, C.L.; Zhang, L.; Alayed, Y.; Liu, S.; Vesprini, D.; Chu, W.; Paudel, M.; Cheung, P.; Szumacher, E.; et al. (Radiotherapy & Oncology, 2019)