Pre- and postoperative Ga-68-DOTATOC positron emission tomography for hormone-secreting pituitary neuroendocrine tumours
Autor: | Axel Tjörnstrand, Kerstin Heurling, Oskar Ragnarsson, Helena Filipsson Nyström, Peter Gjertsson, Michael Schöll, Olivera Casar-Borota |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
medicine.medical_specialty
Pathology endocrine system genetic structures Endocrinology Diabetes and Metabolism 030209 endocrinology & metabolism Hormone secreting pituitary neuroendocrine tumour 03 medical and health sciences 0302 clinical medicine Endocrinology Internal medicine medicine somatostatin receptor imaging Pet tracer Cancer och onkologi medicine.diagnostic_test Somatostatin receptor business.industry food and beverages Positron emission tomography 030220 oncology & carcinogenesis Cancer and Oncology Radiologi och bildbehandling business DOTATOC PET Radiology Nuclear Medicine and Medical Imaging |
Popis: | Objectives Somatostatin receptors (SSTRs) are potential targets for detecting pituitary neuroendocrine tumours (PitNETs) that can be visualized effectively with Ga-68-labelled PET tracers. With this study, we have evaluated the diagnostic properties of such a tracer, Ga-68-DOTATOC, in patients with hormone-producing PitNETs before and after surgery. Design/Methods This prospective case-control study presents preoperative positron emission tomography (PET) and histopathological data in 18 patients with somatotroph (n = 8), corticotroph (n = 7) and thyrotroph (n = 3) PitNETs. Patients were scanned pre- and postoperatively with Ga-68-DOTATOC PET. For the postoperative part of the study, patients with gonadotroph tumours (n = 7) were also included. Fifteen pituitary healthy controls underwent the same protocol once. The maximum standard uptake value (SUVmax) was analysed in manually outlined regions around the tumour in patients and around the pituitary gland in controls. specimens were collected during surgery in subjects for assessment of adenohypophyseal tumour cell type and the SSTR expression. Results Thyrotroph tumours showed higher uptake (median SUVmax 41.1; IQR 37.4-60.0) and corticotroph tumours lower uptake (SUVmax 6.8; 2.6-9.3) than normal pituitary gland (SUVmax 13.8; 12.1-15.5). The uptake in somatotroph tumours (SUVmax 15.9; 11.6-19.7) was similar to the uptake in the pituitary gland. There was a strong correlation between SUVmax and SSTR2 expression (r = .75 (P < .01)). In the postoperative evaluation, PET was able to correlate tracer uptake with biochemical cure and noncure in patients with an abnormal postoperative magnetic resonance image and a preoperative tumour uptake SUVmax > 13.8. Conclusions Ga-68-DOTATOC PET can be used to detect thyrotroph tumours in the pre- and postoperative imaging assessment. Corticotroph tumours had a significantly lower uptake compared to the pituitary gland but without a distinct increased tumour uptake the clinical postoperative value is limited. |
Databáze: | OpenAIRE |
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