Where do you get that figure from? All the figures I have state lung and bowel cancers are the most common, along with prostrate and breast for sex specific cancers (although looking at their rates they would be the higher even though their rates in the other sex are exceedingly low).
That's because melanoma and non-melanoma skin cancer are split, as other lymphoma and non-Hodgkin lymphoma, multiple myeloma etc. in data despite affecting same cell lines.
If you sum these two up they end on top respectively in that order.
Albeit prostate cancer is really close.
It's an artifact of grouping used. For colorectal for example, adenomas and carcinomas are lumped for a change.
Prostate is the second most common worldwide, or skin cancer, depending on year. The big 5 are over 1.5 million. (WCRF data. They lump all lung cancers but split immune system and skin cancers. For reasons? Bladder and lung cancer incidence is highly dependent on factors such as smoking and specific chemicals used in manufacturing. Potentially the same with colorectal and diet. Rates for breast and prostate are high because they're easy to spot and well tested. So per country data varies a lot.)
