Cancer rates in under-50s surge 79% over three decades

Rise in early-onset cancer: global incidence up 79%, cause remains unclear

Why is cancer, a disease typically associated with aging, increasingly affecting people who haven't yet turned 50? There is no definitive answer. The announcement that Kate Middleton, aged 42, has been diagnosed with a tumor and is undergoing "preventive chemotherapy" has refocused attention on a phenomenon that the scientific community admits it cannot fully explain. The numbers, however, are stark: a study published in BMJ Oncology estimates that global cancer incidence among those under 50 has increased by 79% over three decades.

Age remains the primary risk factor. A tumor begins when a cell grows uncontrollably, and the likelihood of the body's control systems failing increases with age. What is striking is that this rise is also being detected in age groups previously considered protected, and no one can pinpoint the exact source.

How much has cancer increased in under-50s?

The 79% figure comes from research in BMJ Oncology comparing data across three decades. Its authors identify dietary risks, alcohol consumption, and tobacco use as the main factors linked to early-onset cancers in 2019. Cancer is the leading cause of death worldwide: the World Health Organization estimates that approximately 10 million people died from the disease in 2020.

The debate also cites a WHO projection suggesting that cancer cases will increase by 77% by 2050. These are projections, not diagnoses, but they outline a trend that is no longer driven solely by population aging.

Which tumors are growing fastest: breast and digestive

A US study published in Jama Network Open revealed that between 2010 and 2019, the highest incidence of early-age tumors was in breast cancer, but the most rapid expansion occurred in gastrointestinal cancers (colon, pancreas, stomach), trinc by tumors of the urinary system and female reproductive organs.

Another study, published in Science, notes that early-onset colon cancer is rising globally and is projected to become the leading cause of cancer death for people aged 20 to 49 in the United States by 2030. The authors acknowledge that the exact reasons remain unknown, and a third paper in Cancer Discovery reinforces this idea: the relatively low proportion of hereditary cases points to environmental and behavioral factors.

Diet, alcohol, and tobacco: factors highlighted by studies

Obesity, diets high in red or processed meat, lack of physical activity, alcohol, and tobacco. This is the list repeated by published research, suggesting that much of the problem develops long before diagnosis: starting in the first years of life.

Sugar occupies a distinct place in the debate. A US study is cited suggesting that drinking two or more sugary beverages daily doubles the risk of colorectal cancer before age 50. Additionally, the industry adds sugar to non-sweet foods, making it difficult to track actual intake. Some experts also include pesticides, additives, heavy metals, and sedentary lifestyles; however, since these affect nearly the entire population, they explain little on their own.

Young patients face delayed diagnosis

Oncologist Martín Lázaro points to an uncomfortable factor: young people may even experience a diagnostic delay. When faced with nonspecific symptoms, the possibility of a tumor is often not considered precisely because of the patient's age, which can lead to a worse prognosis. Regarding improved diagnostic techniques as an explanation for the rise, he expresses skepticism: tumors eventually manifest themselves one way or another, "if not at 42, then at 43."

The available evidence, according to consulted specialists, is still incipient and limited. There are lung cancer cases in young patients where tobacco hasn't had time to take its toll, forcing researchers to look toward genetic factors that current methods fail to identify.

What the evidence does not support: from overdiagnosis to vaccines

Some argue in the discussion that part of the increase is actually an excess of diagnoses: tiny tumors that might never have caused symptoms are detected, subjecting patients to aggressive treatments. The most cited case is prostate cancer detected via PSA, where overdiagnosis and overtreatment are criticized from within the medical profession itself. It is a technical debate, not a mere notion.

What lacks backing is attributing the phenomenon to mRNA vaccines. An in silico study on the interaction between spike protein and p53/BRCA is a computer analysis: it demonstrates neither causality nor any effect in real populations. The authors of gastrointestinal tumor research themselves attribute the origin to environmental, behavioral, and lifestyle factors.

Much has been discussed regarding the Princess of Wales' age of 42, and with statistical reason: after 40, cancer risk increases due to the natural aging process. Some argue in the thread that the rise occurs across all age groups. "We don't know why," oncologists admit. It is the most honest statement about the issue and, also, the least reassuring.