SAMD1 and autoimmune polyendocrinopathy: We further detected the expression of SAMD1 in HUVECs of the Control group (without any treatment), Health group (cultured with 10% healthy serum), and APS group (cultured with 10% APS patient serum), and the qRT‐PCR found that the expression of SAMD1 in the APS group was lower versus that in the Health group and Control group (Figure 1C, p < .05), but no obvious difference was seen between the Health group and the Control group.