I am sorry, it was indeed not nice of me. I apologize.
I think why our RT approaches to pancreatic cancer have not managed to make RT an established component of multidisciplinary treatment do not have much to do with radiation biology, we won‘t find any answers there. It‘s not that we can‘t kill pancreatic cancer with RT. If you look at pCR rates of trials using SBRT in the neoadjuvant setting, the figures are not that bad and sometimes higher to those seen for instance with standard 5 weeks of CRT for rectal cancer, where RT is a standard component, still.
The problem is rather tumor biology, early metastatic affinity, a surgical procedure (as standard of care local treatment) with high morbidity and location of diease.
Pancreatic cancer seems not to be responding to IO (and we now know that some of the effects of RT can also come from activation of the immune system, so that pathway also won‘t help). It also does not respond yet to targetted agents (with the few exceptions of BRCA-mutant pancreatic cancer), so systemic control is limited in a disease that spreads early and in various ways (lymphatics, blood, peritoneal). Whipple procedures cause morbidity, meaning that we lose patients to complications (think not only the immediate periooperative period, but also the fistulas, dumping, cachexia and possible detrimental effects to the immune system - all big surgical procedures do that) and many patients are in bad shape to tolerate adjuvant treatment. Location of disease means that there is an abundance of blood and lympatic vessels for the tumor to met out (see previous point), a lot of incomplete resections and our targets are surrounded by OARs.
This is simply a very tough situation.