“You might think, ‘this is a negative study. There's no difference.’ However, it is very notable that the prevalence of monoclonal gammopathy was 6.1%. That is 3 times as high as we would expect in somebody in their 40s,” she said. “Also, 7% having a cancer diagnosis is not insignificant.” She added: “It is very possible that many of these service members already have full-blown multiple myeloma or something associated with monoclonal gammopathy that just has not been diagnosed yet.”
In another study, this one published in 2021, Dr. DeStefano and colleagues tracked 8834 injured Iraq/Afghanistan veterans and compared them with matched controls to see if there was a link between severe trauma and cancer. There wasn’t except for lymphoma (22 vs 7 cases, respectively; odds ratio = 3.1; 95% CI, 1.34-7.37; P = .008). The connection remained after adjustment for confounders.
What’s going on? “It’s possible that blast injury might induce some alterations to the immune system that might set the stage for lymphoma genesis,” she said. “Or maybe that blast injury is a surrogate for a toxic exposure: Maybe carcinogens are released during a blast injury.”
Dr. DeStefano also highlighted a 2022 study that tracked 386,190 Air Force officers. The study found that combat pilots (9.1% of the total) had greater adjusted odds of testicular and prostate cancers and melanoma than the other officers. Why? “Military pilots have exposure to cosmic ionizing radiation as well as ultraviolet radiation,” she said.
But while “these are scary, sobering things,” she noted that combat pilots were less likely to develop several cancers than the general population, including kidney, testicular, colorectal, bladder and thyroid cancer, and they were less likely to die from colorectal cancer.