Why cancer cases rise in Nigeria, low-income countries
MORE explanations yesterday emerged on why cancer cases are on the rise in countries with low and middle incomes but have fallen in many high-income countries. This data is unfolding even as lung cancer was adjudged as the most common cancer worldwide, accounting for 13 per cent of new diagnoses.
According to research published yesterday in Cancer Epidemiology, Biomarkers & Prevention and Medical News Today, many low- and middle-income countries have seen a growth in risk factors that are typical of western countries, such as smoking and unhealthy diet, leading to a higher prevalence of cancer.
While, in high-income countries, screening and detection efforts have improved in recent years, and risk factors such as smoking have decreased, resulting in lower the incidence and mortality rates from several common types of cancer.
According to World Cancer Research Fund International, there were an estimated 14.1 million cancer cases worldwide in 2012, of which 7.4 million cases were in men and 6.7 million in women. This number is projected to increase to 24 million by 2035.
Figures for 2012 show that overall, lung cancer was the most common cancer worldwide, accounting for 13 per cent of new diagnoses. Breast cancer – affecting mainly women – was the second, with nearly 1.7 million new cases, and colorectal cancer was third, with nearly 1.4 million new cases.