MRI-LINAC Radiation for Prostate Cancer with Dr. Michael J. Zelefsky
What if prostate cancer treatment weren’t months of daily radiation—but five ultra-precise sessions guided in real time by MRI? Today, Dr. Michael J. Zelefsky (Professor of Radiation Oncology, NYU Grossman School of Medicine) explains how MRI-LINAC and adaptive planning are redefining accuracy, reducing side effects, and personalizing care. A pioneer behind IMRT and image-guided radiotherapy, Dr. Zelefsky breaks down SBRT vs. IMRT, protons vs. photons, HDR brachytherapy, when to add hormone therapy, and how genomics + AI are shaping what’s next.
In this conversation, Dr. Zelefsky charts the evolution from long-course radiation to short-course SBRT with outcomes comparable to 7–9 week regimens—thanks to precision imaging and planning. He clarifies where IMRT ends and SBRT begins, why protons haven’t shown superiority over photons in prostate cancer, and where HDR brachytherapy (Ir-192) shines—especially as a boost in higher-risk disease. We dig into dose equivalence (why 5×8 Gy can match ~80–90 Gy long-course), risk-based treatment + ADT duration, and how Decipher/Artera scores can refine decisions. Most exciting: MRI-LINAC with continuous motion monitoring keeps the prostate in a virtual “bullseye,” enabling whole-gland treatment with focal boosts today—and potentially true focal therapy tomorrow as biologic imaging and AI mature.
Time-Stamped Highlights
00:00 – Welcome
02:00 – Why Dr. Zelefsky’s work is so respected; career arc and impact
04:00 – What changed: CT/MRI planning → 3D-CRT → IMRT → SBRT
12:45 – IMRT vs. SBRT: definitions, session counts, who gets what
19:10 – Energy sources overview: photons, protons, brachytherapy
20:30 – Protons vs. photons: evidence, indications, cost, access
24:00 – HDR brachytherapy (Ir-192) as a temporary “in-and-out” boost
28:00 – Dose logic: why 5×8 Gy (~40 Gy) ≈ long-course 80–90 Gy
29:30 – Risk groups (low/intermediate/high) and when ADT is crucial
33:00 – ADT durations (6–36 months): what trials actually showed
37:00 – Genomics (Decipher/Artera): resolving risk discrepancies
39:00 – What MRI-LINAC adds: real-time adaptive planning
43:00 – Continuous Motion Monitoring (CMM): beam stops if target moves
47:00 – Treat whole gland + boost the DIL (FLAME study approach)
49:00 – Toward focal therapy with better biologic imaging + AI
54:00 – How to choose: values, side-effects, lifestyle, comorbidities
01:01:00 – Final guidance: don’t be overwhelmed—multiple good option
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