FLT1 expression has been previously reported in a subset of tumor cells where it promotes tumor growth by activating mitogenic pathways (Frank et al, 2011; Lesslie et al, 2006; Sopo et al, 2019; Wey et al, 2005; Wu et al, 2006; Yao et al, 2011). Here, FLT1 is linked to neoplasm.