Global cancer trends show rise in early-onset cases

Global health data indicates a significant epidemiological shift in cancer incidence, with a notable rise in early-onset cases among younger populations. An international study published in BMJ Oncology reported a 79.1% increase in early-onset cancers between 1990 and 2019, including colorectal, thyroid, liver, kidney, pancreas, endometrial, breast, and ovarian cancers.

In the United States, colorectal cancer has emerged as the leading cause of cancer death for individuals under the age of 50, rising from the fifth position in the early 1990s. Research suggests that colorectal cancer in younger patients may possess distinct genetic and biological characteristics compared to older patients, potentially requiring different treatment approaches. A study of Australian patients suggests that early-onset cases often present in women and involve tumors in the left side of the colon.

Other trends highlight challenges in prevention and screening. In the U.S., the proportion of women aged 21 to 29 who have never undergone cervical cancer screening increased from 12.5% in 2005 to nearly 32% in 2023. Experts attribute the rise in certain cancers to lifestyle factors, including ultra-processed food consumption, sedentary behavior, smoking, alcohol use, and obesity.