I've been an attending since 2016. When I was in residency, I had attendings telling me that SRS for any number of brain mets was dumb because "they're just going to die anyway" (one particularly vocal attending ran a related ASTRO committee). Certainly more than four was considered crazy, and many thought these patients should all get WBRT on top of the SRS (NCCTG trial came along around that time to dispel that one).
I fought other attendings in my institution back then to treat even five brain mets with SRS alone. When I first started, I had a breast cancer patient who had 10 small mets that I did GK. Insurance and other attendings thought I was crazy. She never developed a new brain met, went disease free for 6 years, and eventually passed away this year (8 years later) of liver metastases.
I had to fight insurance once in a protracted battle that I eventually won because a patient with esophageal cancer and no systemic disease had a cerebellar met then developed another one three months later and they wanted WBRT. That patient never developed another met brain or otherwise after that second SRS and is still NED 7 years later.
So many battles over the years... Oh boy they thought I was crazy here when I told them that SCLC PCI was useless after the Japanese trial. We've had plenty of people even here on SDN disagree with me about this. We're one of the top accruers on MAVERICK with my heartfelt hope that it will kill PCI for good. I fought like hell to start doing proton CSI for LMD in a public battle with my chair. Nobody did re-irradiation to the spine at any dose level, and now I'm doing SBRT on SBRT and third course re-re-irradiations.
I like neuro rad onc because it moves fast, but it creates a lot of controversy sometimes.