It is important to note in any discussion of cancer rates and mortality that items that affect early diagnosis can be variable, with the best example being screening rates for any major cancer. This study examined trends in cancer incidence rates in persons ages 20 to 49. Incidence is the number of new cases in a certain period of time, usually a year, compared to prevalence which is the total number of cases at a particular point in time. The study is a bit dated, using data from 2000 to 2017, but other research suggests that the trend is continuing. Ten cancers in females and seven cancers in men showed a meaningful increase in early-stage incidence in multiple countries. Uterine and colorectal cancer showed an increase in mortality in these early-stage cancers. The increase in these early-stage cancers appears most strongly linked to rises in obesity. (PubMed Article)
