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Research ArticleClinical Studies

Pathogenesis of Osteosclerotic Change Following Treatment with an Antibody Against RANKL for Giant Cell Tumour of the Bone

MAMER ROSARIO, AKIHIKO TAKEUCHI, NORIO YAMAMOTO, KATSUHIRO HAYASHI, SHINJI MIWA, TAKASHI HIGUCHI, KENSAKU ABE, YUTA TANIGUCHI, HISAKI AIBA, YOSHIKAZU TANZAWA, HIDEKI MURAKAMI and HIROYUKI TSUCHIYA
Anticancer Research February 2017, 37 (2) 749-754;
MAMER ROSARIO
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
2Department of Orthopaedics, East Avenue Medical Center, Quezon City, Philippines
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AKIHIKO TAKEUCHI
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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  • For correspondence: a_take@med.kanazawa-u.ac.jp
NORIO YAMAMOTO
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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KATSUHIRO HAYASHI
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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SHINJI MIWA
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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TAKASHI HIGUCHI
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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KENSAKU ABE
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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YUTA TANIGUCHI
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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HISAKI AIBA
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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YOSHIKAZU TANZAWA
3Division of Musculoskeletal Oncology, National Cancer Center Hospital, Tokyo, Japan
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HIDEKI MURAKAMI
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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HIROYUKI TSUCHIYA
1Department of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan
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Abstract

Background: Giant cell tumours (GCTs) of the bone are intermediate tumours that are locally aggressive. Denosumab, an antibody against receptor activator of nuclear factor kappa-B ligand (RANKL), was recently developed; however, it induces osteosclerotic change through an unknown mechanism. We determined whether osteosclerotic change could be induced by neoplastic stromal cells of giant cell tumours (GCTs). Patients and Methods: Participants included four patients with GCT of the bone who were treated with neoadjuvant denosumab. Expression of alkaline phosphatase (ALP), osteocalcin (OCN), RANKL and histone H3K36 trimethylation were assessed through immunohistochemistry of biopsy and surgical specimens. Results: OCN expression was significantly elevated after denosumab treatment, whereas ALP and RANKL expressions were not significantly elevated. Immunofluorescence staining revealed OCN expression and H3K36 trimethylation while their co-localisation was confirmed in the surgical specimens. Conclusion: Denosumab promoted OCN expression and might induce the osteogenic differentiation of GCT stromal cells.

  • Denosumab
  • giant cell tumour of the bone
  • giant cell tumour stromal cells
  • osteosclerotic change
  • RANKL
  • alkaline phosphatase
  • osteocalcin

Giant cell tumours (GCTs) of the bone are common, primary, intermediate tumours that are locally aggressive (1). Traditionally, surgical tumour removal has been the mainstay of treatment, most commonly by intra-lesional excision with extended curettage and bone cement reconstruction (2); however, adequate tumour resection may not be feasible in the sacrum, spine and base of the skull, while advanced disease may need wide excisions that requires careful pre-operative planning to secure margins without damaging nearby neurovascular structures (3).

The discovery that receptor activator of nuclear factor kappa-B ligand (RANKL) was central to the pathogenesis of GCT of the bone has led to the use of the antibody against RANKL, denosumab. Literature reports have noted that new woven bone forms after denosumab treatment in areas that previously had RANKL-positive GCT stromal cells (SCs) (4-6). Several studies have found in vitro evidence that immature osteoblastic phenotypes are maintained among GCT SCs (7, 8), and that GCT SCs can differentiate into mature osteoblasts when separated from the osteoclastic component. This allows them to form mature bone when implanted into immunologically deficient mice (9); however, whether the mechanism underlying this new bone formation after denosumab treatment is reactive or neoplastic, requires clarification. Recent reports have identified that driver mutations of glycine 34 in the histone H3F3A gene are a central feature of GCTs of bone (10 ,11), and other research has shown that these mutations were associated with H3K36 trimethylation by immunohistochemistry (IHC) (12).

In this study, our aim was to compare the expressions of osteogenic proteins in biopsy and denosumab-treated tumour tissues, and to determine whether the osteosclerotic change was induced by GCT SCs.

Figure 1.
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Figure 1.

Knee radiograph and treatment course for Case 4. A radiograph taken at presentation revealed an osteolytic lesion in the right distal femur (a); a radiograph after five courses of neoadjuvant denosumab showed signs of new bone formation and reconstituted cortical bone (b); a radiograph taken 6 months after surgery showed stable artificial bone reconstruction without evidence of tumour recurrence (c).

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Table I.

Patient characteristics.

Patients and Methods

Study design. We studied four patients with histologically diagnosed GCT of bone who received at least five courses of denosumab (RANMARK®; Daiichi Sankyo Co., Ltd., Tokyo, Japan) before surgery. Tissue samples were compared among the patients before and after surgery. The study was approved by the Ethics Committee (No. 2183) for Medical Studies of Kanazawa University Graduate School of Medical Sciences, and written informed consent was obtained from each patient.

Participants. Two men and two women participated, with a mean age of 35 years (range=31 to 43 years). The primary lesion sites were of the distal radius, distal femur, 12th thoracic vertebra and distal tibia. All four patients were administered subcutaneous injections of 120 mg denosumab monthly, with additional loading doses on days 8 and 15. The decision to perform surgery was made after reviewing magnetic resonance and computed tomographic images following the five courses of neoadjuvant denosumab. Three patients underwent intra-lesional curettage (Figure 1), but one underwent total en bloc spondylectomy (Table I) (13).

Tissue analysis. Tissue specimens from each patient taken before and after surgery were fixed in 20% formalin and embedded in paraffin. For each case, one representative block of formalin-fixed and paraffin-embedded tumour tissue was selected. Immunohistochemical and immunofluorescence analyses were then performed.

Immunohistochemistry. All sections were cut to a thickness of 4 μm for IHC. A mouse monoclonal antibody against osteocalcin (OCN) (1:400 dilution; ab13418; Abcam, Cambridge, UK), a rabbit polyclonal antibody against alkaline phosphatase (ALP) (1:50 dilution; ab75699; Abcam) and a rabbit polyclonal antibody against RANKL (1:500 dilution; ab9957; Abcam) were used as primary antibodies. We used anti-mouse or anti-rabbit immunoglobulin G (IgG) conjugated with peroxidase-labelled polymers (EnVision, Dako, Carpinteria, CA, USA) as the secondary antibody. After visualisation of the reaction product, sections were counterstained with Meyer's haematoxylin and cover-slipped for microscopic observation. The appearance of brown stain was considered to indicate immunopositivity. Negative controls were created by excluding the primary antibody.

All positive and negative cells were counted in a minimum of five non-overlapping visual fields at ×200 magnification. The labelling indices for OCN, ALP and RANKL were calculated as the percentage of positive cells among the total number of cells per visual field (14). The labelling index was determined by two assessors (MR and AT) blinded to patient outcome, and the assessment of the labelling index was duplicated.

Figure 2.
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Figure 2.

Histological analysis of tumour from Case 4. The biopsy specimen shows numerous mononuclear stromal cells with multinucleated giant cells (a); the post-surgical specimen shows mononuclear stromal cells, new bone formation and loss of multinucleated giant cells (B) (haematoxylin and eosin stain; scale bar=200 μm).

Figure 3.
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Figure 3.

Immunohistochemistry for receptor activator of nuclear factor kappa-B ligand (RANKL), alkaline phosphatase (ALP) and osteocalcin (OCN) in Case 3. There is positive staining among mononuclear cells. RANKL expression in the biopsy (a) and post-surgical (b) specimens was positive. ALP expression in the biopsy (c) specimen was positive, but strong expression was observed in the post-surgical specimen (d). OCN expression was very weak in the biopsy specimen (e), but there was diffuse strong staining in the post-surgical specimen (f). Scale bar=200 μm.

Immunofluorescence. For immunofluorescence staining, the primary antibodies used were a mouse monoclonal antibody against OCN (1:400 dilution; ab13418; Abcam) and a rabbit polyclonal antibody against trimethylated H3K36 (1:1000 dilution; ab9050; Abcam); the secondary antibodies were rat anti-mouse IgG fluorescein isothiocyanate (1:400 dilution; eBioscience, San Diego, CA, USA) and donkey anti-rabbit IgG (F2 fragments) conjugated to phycoerythrin (1:400 dilution; eBioscience). We performed nuclear staining using 4’,6-diamidino-2-phenylindole (Vectashield®; Vector Laboratories, Inc., Burlingame, CA, USA), and obtained images using a fluorescence microscope (BZ-9000; Keyence, Osaka, Japan).

Statistical analysis. Mean labelling indices for ALP, OCN and RANKL expression from the pre-surgical tissue specimens were compared with corresponding mean labelling indices from the post-surgical specimens by Mann–Whitney U-test. For each test, the result was considered statistically significant when a p-value of less than 0.05 was achieved. All statistical analyses were performed using IBM SPSS version 19.0 (IBM Corp., Armonk, NY, USA).

Results

All cases showed tumour shrinkage and marked new bone formation following denosumab treatment (Figure 1b). Histological analysis revealed decreased numbers of multinucleated giant cells and new woven bone formation (Figure 2). Immunopositivity for RANKL was detected among mononuclear cells in specimens before (Figure 3a) and after (Figure 3b) surgery. ALP expression was detected among mononuclear cells in the biopsy specimens (Figure 3c), but diffuse strong staining was present in the post-surgical specimens (Figure 3d). In contrast, OCN expression was very weak in the biopsy specimens (Figure 3e); however, diffuse strong staining was noted in the post-surgical specimens (Figure 3f).

There was no significant difference between the mean RANKL labelling indices after denosumab treatment and that before (p=1.000) (Figure 4). Although the mean ALP labelling index after denosumab treatment was higher than that before (Figure 4), the difference was not statistically significant (p=0.149). The mean labelling index of the OCN specimens after denosumab treatment was significantly higher than that before (p=0.029) (Figure 4).

H3K36 trimethylation was detected in all post-surgical specimens. Moreover, immunofluorescence double staining for OCN expression (Figure 5a) and trimethylation of H3K36 (Figure 5b) showed their partial co-localization, not only in residual tumour tissue but also in newly formed bone (Figure 5c).

Discussion

Intra-lesional curettage remains the accepted standard of care for managing GCT of bone surgically (15), even though recurrence rates of 50% continue to plague this strategy (16). The key to successful therapy for GCT of bone must, therefore, be in ensuring that all margins are clear and all residual microscopic lesions have been eliminated; however, in addition to these baseline concerns about recurrence, it is important to consider that surgery in some locations can entail greater morbidity. Thus, location should be considered as an equally important factor when treating GCT of bone.

Figure 4.
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Figure 4.

Mean labelling index for receptor activator of nuclear factor kappa-B ligand (RANKL), alkaline phosphatase (ALP) and osteocalcin (OCN) for the denosumab pre- and post-treatment groups. There was no significant difference between the mean RANKL labelling indices pre- and post-treatment (p=1.000). The mean ALP labelling index after denosumab treatment was higher than that before, although the difference was not statistically significant (p=0.149). The mean labelling index for OCN in specimens after denosumab treatment was significantly higher than that before (p=0.029).

In this study, OCN expression was significantly increased following denosumab treatment, and baseline ALP expression was relatively high. Salerno et al. similarly found ALP to be consistently expressed in GCT of bone tissue samples, with GCT SCs showing variable levels of ALP activity (8). We detected RANKL-positive cells in all treated specimens, with the GCT SCs that were positive for H3K36 trimethylation showing OCN expression. Cleven et al., although acknowledging that H3K36 trimethylation was not a surrogate marker for H3F3A mutation, used IHC analysis to show that increased H3K36 trimethylation was associated with mutations in H3F3A (12). It is difficult to detect H3F3A mutation status directly by IHC. We identified GCT SCs as those that expressed trimethylated H3K36, and co-localization of OCN expression and trimethylated H3K36 in both residual tumour and newly-formed bone tissues suggests that there was osteogenic differentiation of GCT SCs. Denosumab therapy, which is targeted and repeatable (15), therefore, seems promising for both surgical down-staging and eliminating residual microscopic lesions following intra-lesional curettage. It appears to act in this setting by inducing osteogenic differentiation of GCT SCs.

The emphasis on differentiation to mature osteoblasts following denosumab treatment is paramount. Girolami et al. did not find significant modification of runt-related transcription factor 2 (RUNX2) nor of special AT-rich sequence-binding protein 2 (SATB2) expression in GCT of bone samples following denosumab treatment (5). Although both RUNX2 and SATB2 are osteoblast markers, they work synergistically to activate osteogenesis through a regulatory circuit with a microRNA cluster (17-19); thus, they are both early, not late, markers of osteogenic differentiation. Nevertheless, the findings of that study support the hypothesis that an immature osteoblastic phenotype is maintained in GCT SCs (7, 8).

Figures 5.
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Figures 5.

This image shows a representative immunofluorescence result on confocal microscopy for Case 3. The expression patterns for osteocalcin (a) and trimethylation of histone H3K36 (b) were determined and the images then merged with that for 4’,6-diamidino-2-phenylindole staining (c). Partial co-localisation of OCN expression and H3K36 trimethylation was observed (white arrows show the co-localisation within residual tumour tissue, while yellow arrows show the co-localisation within newly formed bone). Scale bar=200 μm.

Osteogenic differentiation is regulated by several key factors at both the gene and protein level, some of which are commonly used differentiation markers. RUNX2 is crucial when generating mineralised tissue, and expression of its gene is usually analysed for assessments during the early phases of osteogenic differentiation (20, 21). Another important marker is the effector protein ALP, which is responsible for mineralisation of the extracellular matrix (ECM) (22). Both mRNA and protein expression of ALP can be used to describe the progression of osteogenic differentiation (17). The main constituent of the organic part of the ECM is collagen type I, but it is the two non-collagenous bone ECM proteins, osteopontin and OCN, which are usually used as early and late markers of osteogenic differentiation, respectively (23). Moreover, some studies analysing in vitro osteogenic differentiation in GCT of bone specimens have utilized both ALP and OCN as markers of mature osteoblasts (24, 25).

In the study by Branstetter et al. analysing pathological changes in unresectable or recurrent GCT of bone samples from patients treated with denosumab, significant decreases were observed in the numbers of both tumour-associated giant cells and GCT SCs (4). In this study, RANKL-positive cells were found to persist after denosumab treatment. Lau et al. compared the direct effects of both denosumab and zoledronic acid on GCT SCs, and demonstrated reduced cell growth of GCT SCs treated with zoledronic acid, but not of those treated with denosumab (26). Their findings have been supported by recent studies showing the persistence of proliferating GCT SCs despite denosumab treatment (5, 6, 27, 28).

Notably, the inhibitory activity of proinflammatory cytokines on stromal cell differentiation at an early stage (29, 30) indicates that we can now link two mechanisms of action observed in denosumab-treated GCT of bone samples: the induction of the RANK–RANKL pathway and that of new bone formation. GCT SCs are capable of differentiating into a mature osteoblast phenotype when separated from the osteoclastic component (9), which is considered a paracrine effect induced by a reduction in tumour necrosis factor-alpha and interleukin-1-beta secretion by giant cells (8). Therefore, denosumab may restore the osteogenic differentiation of GCT SCs by the same paracrine effect that is a result of its inhibition of giant cell differentiation. These findings suggest that surgeons should acknowledge the fact that residual stromal cells may persist in newly formed woven bone and that this persistence may lead to local recurrence.

In conclusion, we showed that denosumab promoted tumour shrinkage, osteosclerotic change and OCN expression. Denosumab might also induce osteogenic differentiation of GCT SCs; however, it is important to remember that we only analysed a small number of patients who required neoadjuvant denosumab treatment at our hospital. Thus, the findings of this study should be considered preliminary. Furthermore, a larger cohort analysis is necessary.

Acknowledgements

The Authors thank Ms. Yoko Kasai for her assistance.

Footnotes

  • ↵* These Authors contributed equally to this study.

  • Received November 23, 2016.
  • Revision received January 13, 2017.
  • Accepted January 18, 2017.
  • Copyright© 2017, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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Anticancer Research: 37 (2)
Anticancer Research
Vol. 37, Issue 2
February 2017
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Pathogenesis of Osteosclerotic Change Following Treatment with an Antibody Against RANKL for Giant Cell Tumour of the Bone
MAMER ROSARIO, AKIHIKO TAKEUCHI, NORIO YAMAMOTO, KATSUHIRO HAYASHI, SHINJI MIWA, TAKASHI HIGUCHI, KENSAKU ABE, YUTA TANIGUCHI, HISAKI AIBA, YOSHIKAZU TANZAWA, HIDEKI MURAKAMI, HIROYUKI TSUCHIYA
Anticancer Research Feb 2017, 37 (2) 749-754;

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Pathogenesis of Osteosclerotic Change Following Treatment with an Antibody Against RANKL for Giant Cell Tumour of the Bone
MAMER ROSARIO, AKIHIKO TAKEUCHI, NORIO YAMAMOTO, KATSUHIRO HAYASHI, SHINJI MIWA, TAKASHI HIGUCHI, KENSAKU ABE, YUTA TANIGUCHI, HISAKI AIBA, YOSHIKAZU TANZAWA, HIDEKI MURAKAMI, HIROYUKI TSUCHIYA
Anticancer Research Feb 2017, 37 (2) 749-754;
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Keywords

  • denosumab
  • giant cell tumour of the bone
  • giant cell tumour stromal cells
  • osteosclerotic change
  • RANKL
  • Alkaline phosphatase
  • osteocalcin
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