But a low false negative rate is equally unimpressive unless it is combined with a low false positive rate. If I modify my program to always say "You have pancr

But a low false negative rate is equally unimpressive unless it is combined with a low false positive rate. If I modify my program to always say "You have pancreatic cancer", then it would have a 0% false negative rate, but it would still be a worthless test because it would have a 99.99% false positive rate. Simply knowing the false negative rate is not particularly helpful.