Endocrine Abstracts

Background: The chemokine receptor CXCR4 and its associate receptor CXCR7, that modulates CXCR4 function, have been associated with tumor progression and metastasis in human cancers. In ACC, Ki67 index and ENSAT stage are the most important prognostic parameters.Objective: To assess expression of CXCR4 and CXCR7 in adrenal cancer and correlate results with clinical outcome.Methods: CR expression was assessed by immunohistochemistry...

Adrenocortical carcinoma (ACC) is part of the Li-Fraumeni tumour syndrome which is due to germline mutations in TP53. Recent studies demonstrate low penetrance mutations leading to later tumour manifestation. Furthermore, in ACC mutations outside the hotspot region have been found. TP53-polymorphisms have also been described to impact on p53 function. We, therefore investigated TP53 sequence alterations in a large cohort of adult patients with ACC.Method...

Objective: We have developed (123/131I)iodometomidate (IMTO) for specific adrenal imaging and radiotherapy of adrenocortical carcinoma. IMTO binds with high affinity and specificity to the two adrenocortical enzymes aldosterone synthase (CYP11B2) and 11β-hydroxylase (CYP11B1). Metabolic analysis has revealed very rapid metabolization of IMTO both in vitro and in vivo by hepatic esterases. Due to the low metabolic stability of (123/131</su...

Background: Distinction of benign testicular adrenal rest tumours (TART) and potentially malign Leydig cell tumors (LCT) is challenging but important to prevent unnecessary surgery of TART. Ultrasound or magnetic resonance imaging can reliably detect but not distinguish between both tumour entities.Methods: Functional imaging results using the specific CYP11B1/2-inhibitor 123I-IMAZA were investigated in seven adult male patients with classic c...

Background: We have recently introduced [123/131I]iodometomidate (IMTO) which selectively binds to the adrenocortical enzymes aldosterone synthase and 11ß-hydroxylase as SPECT tracer. IMTO has been proven to be useful for molecular adrenal imaging and radiotherapy in adrenal cancer (ACC). As IMTO is rapidly inactivated by endogenous esterases which may impair target tissue to background activity and therapeutic efficacy, >50 new IMTO derivatives have been d...