DPP9 and ovarian serous adenocarcinoma: In high-grade serous ovarian cancer, DPP9 was involved in two gene rearrangements (rearrangement of DPP9 with PPP6R3 and DPP9 with PLIN3 respectively), and the expression of DPP9 3′ end was reduced, resulting in DPP9 losing the active domains (Smebye et al., 2017).