Cancer runs pretty deeply in my family, and I had read the same about breast cancer screenings years ago, re: false positives causing more harm than good, so it'd make sense to see the same trends for other cancers as well.
As far as breast cancer screening goes, the recommendations are for the general population; woman with a family history or other specific risk factors may benefit much more from screening than the general population and/or have different intervals than the general population. This is why communication with physicians is so important.