Tumors come from chromosomal mutations, but chromosomal mutations are mostly caused by acquired factors. "Some chromosomal mutations appear at early stages of stem cell differentiation, leading to problems at later stages not confined to one area, but appearing in multiple areas," Whang-Peng reminds us. Before adulthood, because the various bodily tissues have not yet matured, damage from the environment can be far-reaching.
「有些染色體變異在屬於初期分化的幹細胞階段就出現了，導致分化後不只是一個地方有問題，而是好幾個地方出現問題，」彭汪嘉康特別提醒，在未成年階段，因為身體各組織尚未完全成熟，環境的危害更為深遠。