Validation and physiological association of changes in magnetic resonance imaging radiomic features in response to androgen deprivation therapy in patients with high-risk prostate cancer.

43Background: Biochemical response to neoadjuvant androgen deprivation therapy (nADT) predicts relapse-free and overall survival for prostate cancer (PCa). Radiomic features change in response to nADT, showing potential as prognostic imaging biomarkers. Using multi-parametric MRI (mpMRI) before and after nADT, we aim to validate these changes, evaluate reproducibility and assess their association with previously described ADT-induced reductions in quantitative blood flow (BF) and blood volume (BV) imaging parameters. Methods: 20 patients with high-risk PCa received 4 mpMRI scans, 2 pre-nADT and 2 after 3 months therapy. T2-weighted sequences were used to define tumour regions-of-interest (ROI) which were subtracted from the prostate outline to form the benign prostate ROI. Established kinetic models were applied to dynamic contrast susceptibility MR sequences to derive changes in BF and BV in both ROI. Pyradiomics was used to extract homogeneity and energy features from both ROI. A paired student T-test c...