Gene variants in MAN1A2 [96], kinesin-like protein KIF3B (KIF3B), tetratricopeptide repeat domain 17 (TTC17), pericentrin (PCNT) [97], and PKD1L1 [98,100,101] have been identified in patients with BA, contributing to this ciliary dysfunction. The gene discussed is TTC17; the disease is breast angiosarcoma.