Each year, more than 2.3 million women are diagnosed with breast cancer, making it the most common cancer in the world affecting all adults, according to WHO.
AMN WHO NEWS
The new estimates available on IARC’s Global Cancer Observatory show that 10 types of cancer collectively comprised around two-thirds of new cases and deaths globally in 2022. Data covers 185 countries and 36 cancers.
Lung cancer was the most commonly occurring cancer worldwide with 2.5 million new cases accounting for 12.4% of the total new cases. Female breast cancer ranked second (2.3 million cases, 11.6%), followed by colorectal cancer (1.9 million cases, 9.6%), prostate cancer (1.5 million cases, 7.3%), and stomach cancer (970 000 cases, 4.9%).
Lung cancer was the leading cause of cancer death (1.8 million deaths, 18.7% of the total cancer deaths) followed by colorectal cancer (900 000 deaths, 9.3%), liver cancer (760 000 deaths, 7.8%), breast cancer (670 000 deaths, 6.9%) and stomach cancer (660 000 deaths, 6.8%). Lung cancer’s re-emergence as the most common cancer is likely related to persistent tobacco use in Asia.
There were some differences by sex in incidence and mortality from the global total for both sexes. For women, the most commonly diagnosed cancer and leading cause of cancer death was breast cancer, whereas it was lung cancer for men. Breast cancer was the most common cancer in women in the vast majority of countries (157 of 185).
For men, prostate and colorectal cancers were the second and third most commonly occurring cancers, while liver and colorectal cancers were the second and third most common causes of cancer death. For women, lung and colorectal cancer were second and third for both the number of new cases and of deaths.
Cervical cancer was the eighth most commonly occurring cancer globally and the ninth leading cause of cancer death, accounting for 661 044 new cases and 348 186 deaths. It is the most common cancer in women in 25 countries, many of which are in sub-Saharan Africa. Even while recognizing varying incidence levels, cervical cancer can be eliminated as a public health problem, through the scale-up of the WHO Cervical Cancer Elimination Initiative.
Striking cancer inequity by Human Development Index (HDI)
Global estimates reveal striking inequities in the cancer burden according to human development. This is particularly true for breast cancer. In countries with a very high HDI, 1 in 12 women will be diagnosed with breast cancer in their lifetime and 1 in 71 women die of it. By contrast, in countries with a low HDI; while only one in 27 women is diagnosed with breast cancer in their lifetime, one in 48 women will die from it.
“Women in lower HDI countries are 50% less likely to be diagnosed with breast cancer than women in high HDI countries, yet they are at a much higher risk of dying of the disease due to late diagnosis and inadequate access to quality treatment,” explains Dr Isabelle Soerjomataram, Deputy Head of the Cancer Surveillance Branch at IARC.
WHO’s global survey of HBPs also revealed significant global inequities in cancer services. Lung cancer-related services were reportedly 4–7 times more likely to be included in a HBP in a high-income than a lower-income country. On average, there was a four-fold greater likelihood of radiation services being covered in a HBP of a high-income than a lower-income country. The widest disparity for any service was stem-cell transplantation, which was 12 times more likely to be included in a HBP of a high-income than a lower-income country.
“WHO’s new global survey sheds light on major inequalities and lack of financial protection for cancer around the world, with populations, especially in lower income countries, unable to access the basics of cancer care,” said Dr Bente Mikkelsen, Director of the Department of Noncommunicable Diseases at WHO. “WHO, including through its cancer initiatives, is working intensively with more than 75 governments to develop, finance and implement policies to promote cancer care for all. To expand on this work, major investments are urgently needed to address global inequities in cancer outcomes.
Although a limited number of high-income countries have been able to reduce breast cancer mortality by 40 per cent since 1990, for women in poorer countries, one of the main challenges is to receive a timely diagnosis.
“Breast cancer survival is 50 per cent or less in many low and middle-income countries,” WHO’s Dr. Bente Mikkelsen told journalists in Geneva. But the rate is “greater than 90 per cent for those able to receive the best care in high-income countries”, she emphasized.
To tackle these inequalities, and to coincide with World Cancer Day on 4 February, the UN agency’s Global Breast Cancer Initiative seeks to reduce breast cancer mortality by 2.5 per cent a year.
“Countries with weaker health systems are least able to manage the increasing burden of breast cancer. It places a tremendous strain on individuals, families, communities, health systems, and economies, so it must be a priority for ministries of health and governments everywhere,” said Tedros Adhanom Ghebreyesus, WHO Director-General.