I was wondering why they chose these types of cancer (stomach, esophageal, colorectal, lung and liver) but did not include breast and prostate cancer, which are very common. It seems that they targeted the most deadly forms of cancer rather than the most common. Some numbers from WHO:
The most common cancers are:
Lung (2.09 million cases)
Breast (2.09 million cases)
Colorectal (1.80 million cases)
Prostate (1.28 million cases)
Skin cancer (non-melanoma) (1.04 million cases)
Stomach (1.03 million cases)
The most common causes of cancer death are cancers of:
Lung (1.76 million deaths)
Colorectal (862 000 deaths)
Stomach (783 000 deaths)
Liver (782 000 deaths)
Breast (627 000 deaths)
Or breast and prostate cancer are just harder to spot ?