ViewRay's MRI-Guided Stereotactic Body Radiotherapy Shows Favorable Toxicity Profile In Prostate Cancer

ViewRay Inc VRAY has announced the first toxicity results from the Phase 2 SCIMITAR trial assessing stereotactic body radiation therapy (SBRT) in prostate cancer patients who have undergone surgery. 

• The first toxicity results evaluated 100 patients with recurrent prostate cancer after radical prostatectomy. 
• The patients underwent SBRT delivered under either CT guidance or MRI guidance. 
• The data found that patients treated with MRI guidance had a 30.5% reduction in any grade acute gastrointestinal (GI) toxicity and a 32% reduction in cumulative GI toxicity for up to 6 months.
• Related: ViewRay's MRIdian MRI-Guided Imaging System Signal Superiority For Localized Prostate Cancer.
• No patient treated with MRI-guided radiation therapy experienced grade 3 genitourinary or GI toxicity. 
• The SCIMITAR trial will assess 4-year biochemical recurrence-free survival. Primary endpoint analysis is planned once the 100th patient has 2-year Patient-reported toxicity outcomes (PRO) data available.
• Another Phase 2 trial called SHORTER is comparing urinary and bowel side effects of MRI-guided hypofractionated radiotherapy in 20 treatments (4 weeks) to MRI-guided ultra- hypofractionated radiotherapy in 5 treatments (2 weeks) for prostate cancer that has returned after prostatectomy.
• Nearly 18,000 patients have been treated with MRIdian. Currently, 50 MRIdian systems are installed globally.
• Price Action: VRAY shares closed 6.72% higher at $4.13 on Wednesday.