Radiation Oncology
Expert insights on radiation treatment planning, techniques, toxicity management, and multimodal cancer care.
Recent Discussions
Do you use either memantine or hippocampal sparing technique to preserve cognitive function when giving whole brain radiotherapy?
Dr. @Dr. First Last and I put together the response below:We use memantine and hippocampal sparing technique for all brain metastasis patients who are planning to receive WBRT. This is based off the recently published phase III trial NRG CC001 that found hippocampal avoidance WBRT plus memantine res...
Would you offer hippocampal sparing whole brain radiation for patients with brain metastases due to ES-SCLC?
Until we have built-in auto-segmentation, I find the RTOG contouring atlas very helpful for manual contouring of the hippocampus. I tend to use the lateral ventricle as my main landmark, and look for the circle of gray matter located medial to it. Once I've drawn a hippocampus, I'll look at it in th...
When utilizing hypofractionated radiotherapy in the post mastectomy setting, are the nodal regions dose painted to a different dose or the same dose as the chest wall/reconstructed breast?
Our usual dose to the reconstructed breast/chest wall is 45 Gy in 18 fractions, requiring at least 95% of the PTV to receive 100% of the prescribed dose. The prescribed dose to internal mammary nodes (when treated) is the same, with a slightly lower acceptable dose (95% of the PTV receiving 95% of t...
When in the treatment of OA do you think it is optimal to offer LDRT?
Evidence reality check: Two well-conducted sham-controlled RCTs (hand and knee OA) were negative for clinically meaningful benefit at their primary endpoints. (Minten et al., PMID 30231990, Mahler et al., PMID 30366945). ArthroRad (multicenter randomized, single-blinded) compared standard-dose vs ve...
In a patient with inflammatory triple-positive breast cancer who has a pCR to neoadjuvant chemotherapy, but has an incidentally found focus of intermediate-grade ER+/PR+/HER2- ILC in the mastectomy specimen, how would this impact your adjuvant radiation recommendations?
This finding would not have any impact on my recommendations, since her management needs to be guided by the inflammatory breast cancer. That means chest wall plus nodal irradiation tailored to the findings of axillary surgery. There are no data on whether we can decrease the dose in patients with a...
Is long term ADT now the standard of care with salvage prostate bed RT?
The dreaded hormone question...After 40 years of embarking on extremely well designed randomized trials, we still are confused about the who, what, when of ADT. Will RTOG 9601 create a new care standard? As @Dr. First Last said, I think we will see increased utilization. I have been using bicalutami...
What is your treatment approach for a pediatric patient with H3K27M-mutant diffuse midline glioma following progression after radiation therapy?
First, if the patient is at least six months from initial radiation and has had a reasonable initial response, reirradiation is the best proven treatment for recurrence. We would also encourage enrollment on a clinical trial (the DMG National Tumor Board is a helpful resource for determining for whi...
What factors do you consider when selecting dose/fractionation for whole brain radiotherapy?
I assume this question is for brain metastases patients who are not eligible for hippocampal avoidance WBRT (ineligible criteria including but not limited to - mets 5 mm within either hippocampus, germ cell/small cell/lymphoma, leptomeningeal disease, etc.) - my default WBRT dose fractionation is 30...
What resection margins are required for DCIS with a component of invasive disease?
The SSO-ASTRO-ASCO guidelines of 2016 on margin status for patients with tumors that are pure DCIS or predominantly DCIS requiring a minimum of 2 mm for those receiving RT were based on a meta-analysis of (mostly older) published studies, not individual patient data. Three much more recent studies f...
What is the role for chemoimmunotherapy in the up front setting in non-metastatic head & neck cancer outside of clinical trials?
Phase III studies of immunotherapy concurrent with chemo-RT vs chemo-RT alone, JAVELIN Head and Neck 100 and KEYNOTE-412, didn’t demonstrate a survival benefit of the immuno-containing regimens (while post hoc analyses suggested that PD-L1 positive patients may have benefited). These studies did not...