（出典）　From Genes, environment, and “bad luck” by Martin A. Nowak, Bartlomiej Waclaw,　　 Science 24 Mar 2017. Reprinted with permission from AAAS.

【訂正】（誤）division →（正）divisions （誤）issue →（正）tissue

（出典）　Reprinted by permission from Springer Nature: Springer, Nature, Substantial contribution of extrinsic risk factors to cancer development by Song Wu et al Copyright (c) 2015, Springer Nature.

（出典）　Waqas Rehman, Lisa M. Arfons, Hillard M. Lazarus, Therapeutic Advances in Hematology, 　　　　　August 4, 2011, p.291-293, 296-298, copyright (c) 2011 by SAGE Publications. 　　　　　Reprinted by Permission of SAGE Publications, Ltd.