KLK3 and neoplasm: The following characteristics are assessed before the start of the radiotherapy course: medical history, medication, age, body mass index, Karnofsky performance score, bladder volume, prostate volume, tumor stage, histology, Gleason score, level of prostate-specific antigen (PSA), risk group of prostate cancer, dose fractionation parameters, treatment volume, technique of radiotherapy, and patient’s smart phone experience and need for support.