While confronted with cancer, individuals may experience a sense of helplessness; however, scientific inquiry has pinpointed numerous strategies that can diminish the likelihood of its onset.
According to a recent compilation of data from the World Health Organization (WHO), a substantial proportion of cancer diagnoses globally, exceeding one-third, are amenable to prevention.
Collectively, lung, gastric, and cervical malignancies account for nearly half of these preventable instances.
This signifies that millions of fatal cancer diagnoses annually could be averted through medical interventions, modifications in personal habits, mitigation of occupational hazards, or addressing environmental contaminants.
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“This significant research undertaking offers a thorough evaluation of preventable cancer on a global scale, integrating for the first time infectious etiologies of cancer alongside risks associated with behavior, environmental influences, and occupational exposures,” stated Isabelle Soerjomataram, a medical epidemiologist at the WHO and a principal author of the analysis. “Tackling these modifiable causes presents one of the most potent avenues for reducing the worldwide burden of cancer.”
The assessment revealed that in the year 2022, there were close to 19 million new oncological diagnoses. Approximately 38 percent of these findings were attributable to 30 distinct, alterable risk factors.
These encompassed prevalent habits such as tobacco smoking, excessive alcohol intake, elevated body mass index, insufficient physical activity, the use of smokeless tobacco products (e.g., chewing tobacco), a customary stimulant identified as areca nut, suboptimal infant breastfeeding practices, atmospheric pollution, ultraviolet radiation exposure, pathogenic agents, and a multitude of over a dozen occupational exposures.
The most significant modifiable determinant linked to cancer incidence? The act of smoking tobacco. This was implicated in 15 percent of all cancer cases diagnosed that year.
For the male demographic, the risk was notably pronounced. Tobacco smoking was a contributing factor in 23 percent of all new cancer diagnoses globally among men during that specific year.
However, smoking is not the sole causative agent; ambient air pollution also exerts an influence, with its impact exhibiting regional variability.
In regions such as East Asia, for instance, approximately 15 percent of all lung cancer diagnoses in women were attributed to air pollution. Conversely, in North Africa and Western Asia, an estimated 20 percent of all lung cancer diagnoses in men were linked to air pollution.
Following tobacco smoking, the subsequent most significant alterable lifestyle factor identified was the consumption of alcoholic beverages. This was responsible for 3.2 percent of all new cancer diagnoses, approximating 700,000 cases.
Based on the estimations provided by the researchers, tobacco smoking and alcohol consumption collectively account for nearly half (approximately 48 percent) of all diagnosed cases of preventable cancer.
Infectious agents, meanwhile, were associated with roughly 10 percent of new cancer diagnoses. Among the female population, the highest proportion of preventable cancers was linked to high-risk human papillomavirus (HPV) infections, which have the potential to lead to cervical cancer.
Fortuitously, a vaccination now exists for HPV, capable of preventing numerous associated pathologies; however, its uptake in many parts of the world remains suboptimal.
Incidences of gastric cancer are more prevalent among men and are typically related to smoking and infections stemming from crowded living conditions, insufficient sanitation infrastructure, and limited access to potable water.
“This represents the inaugural global analysis to quantify the extent to which cancer risk originates from factors within our control,” commented André Ilbawi, WHO Team Lead for Cancer Control and a co-author of the analysis. “By examining trends across diverse countries and demographic segments, we can furnish governments and individuals with more precise information to facilitate the prevention of numerous cancer cases prior to their manifestation.”
It is now imperative to initiate concerted efforts, as the research clearly indicates that a considerable array of actions can be undertaken to mitigate the risk of individuals developing a wide spectrum of cancer types.
“In summation, an estimated 4 out of every 10 cancer cases worldwide in 2022 could have been averted through the elimination of exposure to the risk factors considered in this comprehensive study,” the researchers elaborated in their publication. “Ultimately, our findings underscore the critical need for effective cancer prevention strategies, which necessitate steadfast political dedication and targeted investment aligned with the specific risk profiles of global populations.”
The findings of this study were disseminated in the esteemed journal Nature Medicine.
