By comparison, MoM hCG levels were only 36% lower in singleton pregnancies during miscarriage when compared with singleton pregnancies, which did not result in miscarriage (MoM kisspeptin: 1.08 ± 0.47, singleton; no miscarriage, 0.69 ± 1.35, singleton with miscarriage, P < .001 vs singleton, no miscarriage) (Figure 2B). The gene discussed is KISS1; the disease is spontaneous abortion.