Cancer cases are rising rapidly worldwide, and experts warn that health systems may not be prepared for what lies ahead. Despite improvements in treatment, new data show that a large share of deaths could be avoided through better prevention, earlier diagnosis, and reliable access to care.
Since 1990, the number of new cancer diagnoses has more than doubled. In 2023, the world recorded about 18.5 million new cases and 10.4 million deaths (excluding non-melanoma skin cancers). The burden is increasingly concentrated in low- and middle-income countries, where growing populations, longer life expectancy, and limited healthcare resources collide.
A major concern is that many deaths are tied to risks that can be reduced. Researchers estimate that more than 40% of cancer deaths globally are linked to modifiable factors, including tobacco use, unhealthy diets, obesity, and high blood sugar. This means proven public health measures—such as tobacco control, vaccination and screening programs, and policies that support healthier lifestyles—could prevent millions of deaths.
What the World Could Face by 2050
Projections suggest the global cancer burden will keep climbing. Over the next 25 years, new cases are expected to rise by around 61%, reaching roughly 30.5 million new diagnoses per year by 2050. Annual deaths could increase by nearly 75% to about 18.6 million.
Much of this growth is driven by demographics rather than a universal worsening of individual risk. Researchers note that age-adjusted incidence and mortality rates are not expected to rise globally, indicating that population growth and aging are the dominant forces behind the increase in total cases and deaths.
Even so, the projected progress is unlikely to meet the United Nations goal of cutting premature deaths from non-communicable diseases, including cancer, by one-third by 2030.
Progress Is Real—But Uneven
Globally, age-standardized cancer death rates have declined over recent decades, reflecting improvements in prevention, diagnosis, and treatment. However, those gains are not shared equally. In a number of low- and middle-income countries, both cancer rates and total deaths continue to increase.
In 2023, breast cancer was the most commonly diagnosed cancer worldwide. Cancer of the trachea, bronchus, and lung remained the leading cause of cancer death globally.
Researchers also point to stark differences between countries. Some have achieved large declines in cancer mortality, while others have seen substantial increases in both incidence and deaths over the same period, underscoring how strongly outcomes depend on prevention policies, early detection, and access to effective treatment.
Preventable Risks Still Dominate
In 2023, an estimated 4.3 million cancer deaths—about 42% of the global total—were linked to 44 modifiable risk factors. Behavioral risks made up the largest share across income groups.
Tobacco use was the single biggest contributor, linked to about 21% of cancer deaths worldwide. In low-income countries, unsafe sex emerged as the leading risk factor, reflecting the continuing impact of infection-related cancers where vaccination, screening, and treatment services are less accessible.
Men were more likely than women to die from cancers tied to modifiable risks. Researchers estimate that about 46% of cancer deaths among men were associated with preventable factors such as tobacco, alcohol, occupational exposures, diet, air pollution, and metabolic risks. Among women, about 36% of cancer deaths were linked to modifiable risks, including tobacco, unsafe sex, obesity, unhealthy diet, and high blood sugar.
Why Low- and Middle-Income Countries Face the Greatest Threat
Future increases are expected to fall disproportionately on countries with fewer resources. More than half of new cases and nearly two-thirds of deaths by 2050 are projected to occur in low- and middle-income countries, where cancer care can be limited by shortages of trained staff, diagnostic equipment, medicines, radiotherapy capacity, and reliable referral systems.
Experts argue that preventing a deepening crisis will require cancer control to be treated as a core global health priority, not a secondary concern. They emphasize the need for stronger prevention efforts, earlier and more accurate diagnosis, and access to quality treatment and supportive care.
Data Gaps and Uncertainty
Researchers acknowledge that estimates depend on the quality of available data, which remains limited in many settings. In some regions, weak cancer registries and incomplete death reporting make it harder to measure trends and plan services. Some infectious causes of cancer may also be undercounted in current estimates, potentially leading to an underestimation of preventable deaths.
Projections also do not fully account for disruptive events such as the COVID-19 pandemic, ongoing conflicts, or future medical breakthroughs that could shift outcomes substantially.
What Experts Say Should Happen Next
The overall message is clear: the world is heading toward a much larger cancer burden, but a significant portion of deaths could be prevented. Researchers and independent commentators call on governments to increase funding, strengthen health systems, reduce inequalities, and invest in evidence-based cancer control—including prevention, early detection, treatment, supportive care, and better surveillance through robust cancer and vital registries.
