Hashemi et al. (2015) looked at a paediatric cohort and identified the BP1-BP2 deletion with a frequency of 0.76%. The patients had a CHD prevalence of 20% and a wide variety of phenotypes. Some of the cardiac anomalies reported included transposition of the great arteries (n = 1), aortic stenosis (n = 1), ASD (n = 1), and VSD with patent ductus arteriosus (n = 1). A study by Davis et al. (2019), analysed a cohort of patients with the BP1-BP2 deletion to identify differences in clinical features in patients that inherited the deletion. Here, IGFBP2 is linked to Patent ductus arteriosus.