These data fit well with a recent publication that has demonstrated a positive impact of CD4+ and CD8+ T cell infiltration on survival in PDA, as well as a negative impact of both Treg and specific myeloid cell infiltrates.[2] Due to our smaller total number of patients and heterogeneity in treatment strategy, we are unable to demonstrate a similar independent prognostic value of the immune infiltrate. Here, CD4 is linked to Patent ductus arteriosus.