On 2015 Nov 18, Alvaro Alonso commented:

Just a couple of comments. 1. I am somewhat surprised that this is described as a 'case-control study' since it seems to be a cohort study with an exposed group (children from mothers who received a diagnosed of cancer during pregnancy) matched to an unexposed group (children from mothers without a cancer diagnosis), and followed up for outcomes. 2. The results show that, even if the differences were not significant, exposed children had >40% increased risk of low birth weight and higher risk of other outcomes. Based on these data, I do not think the authors have enough evidence to conclude that maternal cancer did not lead to worse outcomes in children.

On 2015 Nov 18, Alvaro Alonso commented:

Just a couple of comments. 1. I am somewhat surprised that this is described as a 'case-control study' since it seems to be a cohort study with an exposed group (children from mothers who received a diagnosed of cancer during pregnancy) matched to an unexposed group (children from mothers without a cancer diagnosis), and followed up for outcomes. 2. The results show that, even if the differences were not significant, exposed children had >40% increased risk of low birth weight and higher risk of other outcomes. Based on these data, I do not think the authors have enough evidence to conclude that maternal cancer did not lead to worse outcomes in children.