on 15 of 15 Some types of cancer are much more common than others. Although genetic and environmental factors contributing to cancer often make the news, cancer may also arise from random mutations during routine stem cell divisions over the course of a lifetime. Researchers examined the relationship between the total number of stem cell divisions in the lifetime of a given tissue and the lifetime risk of cancer in that tissue. The table provides the data for 31 types of cancers for which this information is known in the U.S. population. Each risk value reflects the proportion of individuals in the population who get this particular cancer over their lifetime. Lifetime risk and number of stem divisions for 31 cancer types Cancer type Lifetime risk Stem cell divisions Cancer type Lifetime risk Stem cell divisions 0.0041000 129,900,000,000 Lung (smokers) 0.0810000 9,272,000,000 AM leukemia Basal cell 0.3000000 Medulloblastoma 0.0001100 272,000,000 3.550,000,000,000 CL leukemia 0.0052000 129,900,000,000 Melanoma 0.0203000 763,800,000,000 Colorectal 0.0480000 1,168,000,000,000 FAP colorectal Lynch colorectal 1.0000000 0.5000000 1.168,000,000,000 Osteosarcoma Arms 1,168,000,000,000 osteosarcoma Head osteosarcoma 0.0003500 29,260,000 0.0000400 4,550,000 0.0000302 6,020,000 Duodenum 0.0003000 7,796,000,000 Legs osteosarcoma 0.0002200 11,130,000 FAP duodenum Pelvis 0.0350000 7.796,000,000 0.0000300 3.150,000 osteosarcoma Ovarian germ Question Source Bald Practice Of Statistics in T 140043 Publisher