在日本，两名患肺癌的儿童在出生期间或出生前不久从母亲那里获得了肿瘤细胞——这是一种极为罕见的发病方式。两位母亲都患有子宫颈癌。悉尼儿童癌症研究所的Paul Ekert（他没有参与这项研究）说，一些癌细胞可能在妊娠晚期逃逸到羊水中，或者在孩子出生时被传染给他们。两个孩子都是阴道出生的，他们有可能吸入了肿瘤细胞。

Two children with cancer may have acquired tumour cells before birth
https://www.newscientist.com/article/2264067-two-children-with-cancer-may-have-acquired-tumour-cells-before-birth/

https://www.newscientist.com/article/2264067-two-children-with-cancer-may-have-acquired-tumour-cells-before-birth/#ixzz6is9ScvDF

Journal reference: New England Journal of Medicine, DOI: 10.1056/NEJMoa2030391