68Ga-DOTATATE PET/CT in Oncogenic Osteomalacia
Oncogenic osteomalacia is rare disease predominantly caused by a small, somatostatin receptor positive mesenchymal tumor, which is frequently hidden in an unusual anatomical site and often goes undetected by conventional imaging. A permanent cure of the disease relies on exactly localizing the tumor and completely removing it. 68Ga-DOTATATE PET/CT is a novel scan that might have improved sensitivity and resolution specifically for somatostatin receptor positive tumors. The investigators will scan the suspicious and confirmed patients of oncogenic osteomalacia and compare it to 99mTc-HYNIC-TOC SPECT/CT and 18F-FDG PET/CT to see if it improves patient care.
|Study Design:||Endpoint Classification: Safety/Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
|Official Title:||68Ga-DOTATATE PET/CT for Detection and Evaluation of the Causative Tumor of Oncogenic Osteomalacia|
- Number and location of lesions detected by 68GA-DOTATATE PET/CT compared to 99mTc-HYNIC-TOC SPECT/CT and/or 18F-FDG PET/CT [ Time Frame: 1 year ] [ Designated as safety issue: No ]Determine if the 68Ga-DOTATATE PET/CT changes care plans compared to conventional imaging/diagnostic techniques (99mTc-HYNIC-TOC SPECT/CT, and/or 18F-FDG PET/CT, MRI, CT, ultrasonography).
- Number of participants and kinds of adverse events as a measure of safety [ Time Frame: One year ] [ Designated as safety issue: Yes ]Determine if any adverse effects are associated with the scan and the number of patients that experience them.
|Study Start Date:||December 2011|
|Estimated Study Completion Date:||February 2014|
|Estimated Primary Completion Date:||December 2013 (Final data collection date for primary outcome measure)|
Experimental: 68Ga-DOTATATE, PET/CT scan
We will perform 68Ga-DOTATATE PET/CT scanning on subjects
Intravenous injection of one dosage of 72-185MBq (2-5 mCi) 68Ga-DOTATATE solution. Tracer doses of 68Ga-DOTATATE will be used to image tumors by Positron Emission Tomography / computed tomography (PET/CT)
Other Name: (68)Ga-DOTA-d-Phe(1),Tyr(3)-octreotate
Oncogenic osteomalacia, or tumor-induced osteomalacia, is a rare, serious paraneoplastic syndrome. It is predominantly driven by a small, benign mesenchymal tumor. The disease is readily prompted by the clinical features such as hyperphosphaturia, hypophosphatemia, low serum vitamin D3 levels, elevated serum fibroblast growth factor 23 levels, and osteomalacia. However, the causative tumor is frequently hidden in an unusual anatomical site and often goes undetected by conventional imaging, such as computed tomography (CT), while a permanent cure of the disease will only rely on exact localization and completely removal of the tumor.
Since mesenchymal tumors express somatostatin receptors (SSR), molecular imaging using radiolabeled somatostatin analogs may be one of the best ways to detect the small, occult tumors. 111In- and 99mTc-labeled octreotide and analogs have been proved useful to detect mesenchymal tumor and other SSR-positive tumors. However, the scintigraphy is insufficient to provide high-resolution images and precise anatomical information. In this study, a novel approach was proposed for exact localization of mesenchymal tumors through positron emission tomography (PET) imaging with 68Ga-DOTATATE and co-registration with CT. 68Ga-DOTATATE PET/CT is a novel method that might have improved sensitivity and resolution specifically for SSR-positive tumors, including the causative tumor of oncogenic osteomalacia.
The investigators will scan the patients in suspicion of oncogenic osteomalacia and the confirmed oncogenic osteomalacia patients in suspicion of relapse or with residual tumor after surgery, and compare it to 99mTc-HYNIC-TOC SPECT/CT and 18F-FDG PET/CT of the same patients. The aim of the study was to see if 68Ga-DOTATATE PET/CT can detect more tumors with higher resolution and more exact localization, and then help to develop optimal treatment strategy and improves patient care.
|Contact: Fang Li, MDfirstname.lastname@example.org|
|Contact: Zhaohui Zhu, MD, PhDemail@example.com|
|Department of Nuclear Medicine, Peking Union Medical College Hopital||Recruiting|
|Beijing, China, 100730|
|Contact: Fang Li, MD 86-10-65295502 firstname.lastname@example.org|
|Contact: Zhaohui Zhu, MD, PhD 86-10-13611093752 email@example.com|
|Principal Investigator: Fang Li, MD|
|Sub-Investigator: Zhaohui Zhu, MD, PhD|
|Sub-Investigator: Hongli Jing, MD|
|Study Chair:||Fang Li, MD||Department of Nuclear Medicine, Peking Union Medical College Hospital|