VAPOR: Visual Analytics for the Exploration of Pelvic Organ Variability in Radiotherapy

•An application for cohort exploration of pelvic organ variability in radiotherapy.•Global exploration of anatomical variability in an abstracted tabular view.•Local exploration of anatomical variability with 2D/3D comparative visualizations.•Correlation of anatomical variability with radiation doses and toxicity.•Four application scenarios conducted with domain experts to showcase VAPOR.