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Diagnosing giant cell tumor of the bone using positron emission tomography/computed tomography: A retrospective study of 20 patients from a single center

  • Authors:
    • Aikeremujiang Muheremu
    • Yuan Ma
    • Zhen Huang
    • Huachao Shan
    • Yuan Li
    • Xiaohui Niu
  • View Affiliations

  • Published online on: June 14, 2017     https://doi.org/10.3892/ol.2017.6379
  • Pages: 1985-1988
  • Copyright: © Muheremu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The aim of the present study was to evaluate the sensitivity of positron emission tomography/computed tomography (PET/CT) in the diagnosis of giant cell tumor of the bone (GCTB) using the maximum standard uptake value (SUVmax), which indicates the metabolic rate of tissue. Patients diagnosed with pathologically confirmed GCTB between January 2006 and July 2015 were included in the study. Data from PET/CT scans and pathological and clinical reports for all patients were retrospectively reviewed. The SUVmax value from the PET/CT scan of each patient was retrieved and analyzed. A total of 20 patients [12 male and 8 female; age range, 12‑45 years; mean age ± standard deviation (SD), 33.5±15.7] with complete PET/CT data and a pathologically and clinically confirmed diagnosis were examined. The SUVmax of GCTB was between 1.8 and 18.6, with a mean ± SD of 9.2±3.8. Although GCTB is not considered to be a malignant lesion, PET/CT scans of the tumors reveal high‑grade malignant osseous sarcomas. It is, therefore, important not to mistake such lesions for osteosarcomas or metastatic malignancies of the bone.

Introduction

Giant cell tumor of the bone (GCTB) is a primary intramedullary bone tumor with variable growth potential (1). GCTB does not normally exhibit the invasive growth pattern of malignant sarcomas; however, patients often require a second or third surgical resection owing to recurrence and metastasis following inadequate surgical treatment by an inexperienced orthopedic surgeon (2,3). At the Department of Orthapedic Oncology Surgery, Beijing Jishuitan Hospital (Beijing, China), >50% of patients with GCTB present with recurrent or metastatic lesions following surgical treatment at an orthopedic center not specialized in orthopedic oncology.

A diagnosis of GCTB is confirmed through analysis of the clinical, radiological and histopathological manifestation of the disease. Patients with GCTB often present with pain and swelling at the site of the lesion. Occasionally, a pathological fracture is the direct reason for the patients' attendance at the orthopedic clinic (Fig. 1) (4). X-ray and computed tomography (CT) scans may show eccentric lytic lesions with a cortical extension. Recently, with the increasing popularity of novel imaging techniques, including positron emission tomography (PET)/CT, the accuracy of bone tumor diagnosis has markedly improved (5). However, owing to the high cost of PET/CT for this supposedly benign tumor (and thus the reluctance of the clinician to order it) there are few studies concerning how GCTB manifests in PET/CT scans (this is particularly true in Asian countries). In the present study, the PET/CT scans from histologically confirmed GCTB patients treated in the Department of Orthopedic Oncology Surgery of Beijing Jishuitan Hospital were retrospectively reviewed to investigate the diagnostic value of PET/CT for patients with GCTB.

Patients and methods

Patient eligibility

The study was approved by the Ethical Committee of Beijing Jishuitan Hospital (Beijing, China). All patients enrolled in this study underwent PET/CT scans between January 2006 and July 2015 and were confirmed to have a pathological and clinical diagnosis of GCTB.

Demographic characteristics of included patients

Data from 20 patients (12 men and 8 women; mean age, 33.5±15.7 years; age range, 12–45 years) with complete PET/CT scans and a pathologically and clinically confirmed diagnosis were analyzed.

18F-fludeoxyglucose (18F-FDG) PET/CT scanning

Prior to chemotherapy, patients underwent 18F-FDG PET testing. These tests were performed using a PET/CT scanner, which was a combined full-ring PET scanner and spiral CT scanner. When the patient's blood glucose level reached <11.1 mmol/l following a 6-h fast, 400 ml barium sulfate was administered, followed by an intravenous injection of 450 MBq 18F-FDG. PET and CT images were acquired from the base of the head to the middle of the thigh, with a wider range of observations taken if the tumor was located below the thigh.

Pathological examinations

Fine-needle and intraoperative biopsies were performed by senior attending surgeons and the chief of surgery, and examined by an experienced specialist from the Department of Pathology, who was provided with all patient information other than the results of the patient's PET/CT scan. The diagnosis was confirmed by observing the resected tumors or from the follow-up clinical and radiological materials of the patient. Once the pathological and clinical diagnosis was confirmed, the results were recorded and analyzed at the end of the study.

Statistical analysis

The SUVmax of each PET/CT scan was recorded and analyzed using SPSS 17.0 (SPSS, Inc., Chicago, IL, USA). The mean age and SUVmax were calculated and recorded as the mean ± standard deviation (SD).

Results

PET/CT scans detected 28 lesions on the 20 patients. The SUVmax of these lesions ranged between 1.8 and 18.6, and the mean SUVmax was 9.2±3.8.

Of the 20 patients included in this study, 9 had never received any surgical or adjuvant therapies prior to the PET/CT scan. As prior therapy could have altered the avidity of tumor cells (thus affecting the SUVmax in PET/CT tests), data from those patients were analyzed separately, in addition to the overall analysis. The mean SUVmax of those 9 patients was 9.2±2.9 (range, 5.2–13.7). Although the mean SUVmax value was the same as for the 20 patients overall, the range of values and the SD were smaller.

The majority of GCTBs were located in the extremities (Fig. 2), but some spinal (Fig. 3) and pelvic (Fig. 4) lesions, in addition to several lung metastases (Fig. 5), were observed. To assess whether the PET/CT scans were affected by the location of GCTB, SUVmax values were also analyzed according to their source locations. The analysis revealed that the mean SUVmax of GCTB was higher in the pelvis and spine than the extremities, however, the difference was not significant (Table I).

Table I.

SUVmax of GCTB in different locations.

Table I.

SUVmax of GCTB in different locations.

SUVmax value

GCTB locationPatient no.LowestHighestMedianMean ± SD
Femoral bone71.814.5  7.5   8.4±4.6
Below knee83.914.4  7.8   8.3±3.5
Spine47.613.710.010.4±2.7
Pelvis35.218.612.612.1±6.7
Lung44.510.8  9.9   8.8±2.9

[i] SUVmax, maximum standard uptake value; GCTB, giant cell tumor of the bone; SD, standard deviation.

Discussion

GCTB accounts for 5% of primary skeletal tumors and 21% of benign bone tumors (6,7). The tumor occurs primarily in the distal femur, proximal tibia and distal radius (812), with the incidence of GCTB in small bones being relatively rare (13). Diagnostic parameters and treatment measures of GCTB remain controversial among surgeons (14). In general, GCTB is metabolically benign and appears primarily at a single site; however, a considerable portion of patients present with GCTB in multiple locations. In the present study, 28 GCTB lesion sites in 20 patients were analyzed, 4 of which were GCTs that had metastasized to the lung following the recurrence of GCTB in the extremities (Figs. 5 and 6). The aggressiveness of GCTB can differ between individuals, which could cause local destruction and metastasis (15). Previous studies have reported that GCTB metastasizes to the lymph nodes, liver, soft tissue, brain, mediastinum, scalp, kidney and penis (1619).

Histologically, the tumor consists of osteoclast-like and spindle-shaped multinucleated giant cells (20). These giant cells share the same specific markers as osteoclasts, including tartrate-resistant acid phosphatase (21), cathepsin K (22), carbonic anhydrase II (23), calcitonin receptor (24) and receptor activator of nuclear factor κ-light-chain-enhancer of activated B cells (25), and are similarly capable of bone resorption. Giant cells are, however, substantially larger than the osteoclasts and contain hundreds of nuclei (26). Previous studies have provided clinicians with diagnostic genetic markers of GCTB, including tumor proteins 53, 63 and 73, kinectin, nebulin, ρ-associated coiled-coil containing protein kinase 1, and sterile α-motif and leucine zipper-containing kinase AZK (2729).

Unlike the majority of non-malignant tumors, the majority of GCTB lesions in the present study exhibited the intensive uptake of 18F-FDG. This could be explained by the cellular consistency of GCTB. Previous studies have demonstrated that glucose transporter type 1 (GLUT-1) is upregulated in human macrophages (30,31) and that the avidity of 18F-FDG for GLUT-1 is positively associated with GLUT-1 overexpression (32,33). In a previous study, Hoshi et al suggested that the avidity of 18F-FDG was closely associated with strong hexokinase-2 activity in giant and spindle cells (34). It is possible that the high SUVmax of GCTB obtained from the PET/CT scans is a result of GLUT-1 and hexokinase-2 overexpression in macrophages and giant cells in the tumor. The results of the present study suggest that, in order to avoid excessive and unnecessary medical treatment, a diagnosis of GCTB should be considered when PET/CT reveals the presence of a bone lesion with intense 18F-FDG uptake that is suggestive of a high-grade osseous sarcoma.

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Spandidos Publications style
Muheremu A, Ma Y, Huang Z, Shan H, Li Y and Niu X: Diagnosing giant cell tumor of the bone using positron emission tomography/computed tomography: A retrospective study of 20 patients from a single center. Oncol Lett 14: 1985-1988, 2017
APA
Muheremu, A., Ma, Y., Huang, Z., Shan, H., Li, Y., & Niu, X. (2017). Diagnosing giant cell tumor of the bone using positron emission tomography/computed tomography: A retrospective study of 20 patients from a single center. Oncology Letters, 14, 1985-1988. https://doi.org/10.3892/ol.2017.6379
MLA
Muheremu, A., Ma, Y., Huang, Z., Shan, H., Li, Y., Niu, X."Diagnosing giant cell tumor of the bone using positron emission tomography/computed tomography: A retrospective study of 20 patients from a single center". Oncology Letters 14.2 (2017): 1985-1988.
Chicago
Muheremu, A., Ma, Y., Huang, Z., Shan, H., Li, Y., Niu, X."Diagnosing giant cell tumor of the bone using positron emission tomography/computed tomography: A retrospective study of 20 patients from a single center". Oncology Letters 14, no. 2 (2017): 1985-1988. https://doi.org/10.3892/ol.2017.6379