"Approximately 39.5% of men and women will be diagnosed with cancer at some point during their lifetimes (based on 2015–2017 data)."[1] Many lives will experie

"Approximately 39.5% of men and women will be diagnosed with cancer at some point during their lifetimes (based on 2015–2017 data)."[1] Many lives will experience cancer, but not the majority. So it seems to be more complex that immune inadequacy (unless 60% of immune systems are working really well, which would be noteworthy). It seems like a reasonable hypothesis that environment is playing a larger role than individual genetic variations. So encouraging people (or even scaring them) to not smoke, not drink, eat better and exercise more seems like a reasonable approach - it won't cure cancer, but it could reduce rates? 1: https://www.cancer.gov/about-cancer/understanding/statistics https://www.cancer.gov/about-cancer/understanding/statistics