According to the World Health Organization (WHO), the 10 most common types of cancer, ranked by incidence (number of new cases), are Lung cancer Breast cancer Colorectal cancer Prostate cancer Stomach cancer Liver cancer Cervical cancer Esophageal cancer Leukemia Non-Hodgkin lymphoma It is worth noting that the incidence of different types of cancer can vary significantly by region and population. For example, lung cancer is much more common in countries with high rates of tobacco use, while stomach cancer is more common in parts of Asia and Africa.