The results showed that cancer patients had lower serum AMH levels compared to healthy controls (SMD = −0.19, 95% CI = −0.34 to −0.03, P = 0.001), especially women with hematological malignancies (SMD = −0.62, 95% CI = −0.99 to −0.24, P = 0.001). The gene discussed is AMH; the disease is hematologic disorder.