as is the case如何理解？

Kidney transplantation is indicated in patients with stages 4 and 5 CKD. In the United States at the present time, the most common etiology for CKD and subsequent need for kidney transplantation is diabetic nephropathy. When type 1 DM and CKD are present, as is the case in 50%–60% of patients, simultaneous pancreas-kidney (SPK) transplantation or pancreas transplantation after kidney transplantation may be performed. The best results with respect to graft survival appear to occur with SPK transplantation.

肾移植的对象是CKD 4期和5期患者。目前在美国，慢性肾病和随后需要肾移植最常见的病因是糖尿病肾病。当1型糖尿病和CKD出现时，50%-60%的患者可能会同时进行胰肾(SPK)移植或肾移植后进行胰腺移植。SPK移植对移植物存活的影响最好。

as is the case照目前的情况？