Cytotoxic Effects of Common Irrigation Solutions on Chondrosarcoma and Giant Cell Tumors of Bone.

BACKGROUND: Irrigation is commonly used as an adjuvant treatment during the intralesional curettage of bone tumors. The goal of the present study was to analyze the in vitro cytotoxicity of commonly used irrigation solutions on chondrosarcoma and giant cell tumor (GCT) cells as there is no consensus on which solution leads to the greatest amount of cell death. METHODS: An in vitro evaluation was performed by exposing human GCT and human chondrosarcoma cell lines to 0.9% saline solution, sterile water, 70% ethanol, 3% hydrogen peroxide, 0.05% chlorhexidine gluconate (CHG), and 0.3% povidone iodine solutions independently for 2 and 5 minutes. A low-cytotoxicity control (LCC) and a high-cytotoxicity control (HCC) were established to determine the mean cytotoxicity of each solution and each solution's superiority to LCC and non-inferiority to HCC. RESULTS: The present study demonstrated that 0.05% CHG was non-inferior to the HCC when chondrosarcoma was exposed for 5 minutes and when GCT was exposed for 2 and 5 minutes (mean cytotoxicity, 99% to 102%) (p < 0.003 for all). Sterile water was superior to the LCC when chondrosarcoma was exposed for 5 minutes and when GCT was exposed for 2 minutes (mean, 28% to 37%) (p < 0.05). Sterile water (mean, 18% to 38%) (p < 0.012) and 3% hydrogen peroxide (mean, 7% to 16%) (p < 0.001) were both inferior to the HCC. The 3 other solutions were non-superior to the LCC (mean, -24% to -5%) (p < 0.023). CONCLUSIONS: In vitro irrigation in 0.05% CHG provided high cytotoxicity, comparable with the HCC. Therefore, the use of a 0.05% CHG solution clinically could serve as a potential chemical adjuvant during intralesional curettage of chondrosarcoma and GCT. CLINICAL RELEVANCE: In an effort to reduce the burden of residual tumor cells, irrigation solutions are often utilized as adjuvant local therapy. Use of a 0.05% CHG solution clinically could serve as a potential chemical adjuvant to intralesional curettage of chondrosarcoma and GCT. Further in vivo studies may be indicated to assess clinical outcomes and safety associated with the use of 0.05% CHG in the treatment of chondrosarcoma and GCT.

Update and interpretation of 2021 National Comprehensive Cancer Network (NCCN) "Clinical Practice Guidelines for Bone Tumors"

The incidence of primary malignant bone tumors is low, and clinical cognition is insufficient. The establishment of diagnostic criteria is of great significance for prognosis of tumors. National Comprehensive Cancer Network (NCCN) regularly publishes "Clinical Practice Guidelines for Bone Tumors" to summarize the latest treatment progress of bone tumors. In the latest version of the guidelines released in November 2020, surgery is the main treatment for chondrosarcoma, chordoma, and giant cell tumor of bone, which can be combined with radiotherapy or targeted therapy. Ewing's sarcoma and osteosarcoma are treated by surgery combined with chemotherapy. Immunotherapy can be used to treat high-grade undifferentiated pleomorphic sarcoma. For recurrent tumors, surgery combined with radiotherapy, chemotherapy, and/or targeted therapy can be used for control. The guidelines provide a reference for the standard treatment of bone tumors.

Hypercalcaemia after treatment with denosumab in children: bisphosphonates as an option for therapy and prevention?

BACKGROUND: Pharmacologic options for treatment of osteolytic diseases especially in children are limited. Although not licensed for use, denosumab, a fully humanized antibody to RANKL, is used in children with good effects. Among others, one possible indication are giant cell tumors and aneurysmatic bone cysts. However, there are reports of severe hypercalcemia during weeks to months after termination of denosumab, that are rarely seen in adults. METHODS: We collected data of four patients, aged 6-17 years, who experienced severe hypercalcemia after completion of treatment with denosumab for unresectable giant cell tumors of bone or aneurysmal bone cysts and methods of their treatment. The detailed case information were described. RESULTS: One patient was treated with long-term, high-dose steroid therapy, leading to typical Cushing's syndrome. Another patient was restarted on denosumab repeatedly due to relapses of hypercalcemia after every stop. Finally, in two patients, hypercalcemia ceased definitely after treatment with bisphosphonates. However, several applications were necessary to stabilize calcium levels. CONCLUSIONS: There is a considerable risk of hypercalcemia as an adverse effect after denosumab treatment in children. Therapeutic and, preferably, preventive strategies are needed. Bisphosphonates seem to be an option for both, but effective proceedings still remain to be established.

Simvastatin Possesses Antitumor and Differentiation-Promoting Properties That Affect Stromal Cells in Giant Cell Tumor of Bone.

Giant cell tumor of bone (GCTB) is a locally aggressive destructive bone lesion. The management of pulmonary metastasis and local recurrence after the surgical treatment of GCTB remains a challenge. Pathologically, stromal cells in GCTB are known as primary neoplastic cells and are recognized as incompletely differentiated preosteoblasts. Therefore, inducing GCTB stromal cells to differentiate into cells with a mature osteoblastic phenotype may stop tumor growth and recurrence. In this study, we aimed to investigate how simvastatin, a clinically approved and commonly used statin that has been known to promote the maturation of cells of the osteogenic lineage, affects GCTB stromal cells. We found that simvastatin effectively inhibited cell viability by suppressing proliferation and by inducing apoptosis in GCTB stromal cells. Moreover, simvastatin treatment upregulated the expression of genes related to osteogenic maturation, such as runt-related transcription factor 2, osteopontin, and osteocalcin, and increased the mineralization of the extracellular matrix in GCTB stromal cells. Ingenuity pathway analysis was used to discover that the vitamin D receptor pathway was involved in the simvastatin-induced osteogenic differentiation of GCTB stromal cells by upregulating the 1,25-dihydroxyvitamin D metabolism. Taken together, this in vitro study demonstrates the antitumor and differentiation-promoting effects of simvastatin on GCTB stromal cells and suggests the possibility of using simvastatin as an adjuvant therapy for GCTB. These findings support further clinical investigation of the efficacy of using simvastatin as an adjuvant therapy for GCTB to reduce recurrence and distant metastasis after surgical treatment. © 2019 Orthopedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:297-310, 2020.

Paclitaxel Induce Apoptosis of Giant Cells Tumor of Bone via TP53INP1 Signaling.

OBJECTIVE: To evaluate the antitumor capability and to investigate the underlying molecular mechanism of paclitaxel. METHODS: First, cck-8 and apoptosis assays were used to determine survival and apoptotic effects of HS 737.T cells under treatment of paclitaxel. Next, RNA-seq and bioinformatics were used to determine the differentially expressed genes and to analyze the pathway involved. Quantitative real-time polymerase chain reaction was used to verify the accuracy of some differentially expressed genes (DEG). ClueGO was used to decode and visualize functionally grouped GO terms of differentially expressed genes, and to map the DEG protein-protein interactions (PPI) network. Western blotting was used to check the expression of target genes, the cleavage of Caspase-3 and PARP1, and the phosphorylation level of p53. Finally, transcriptomics, bioinformatics, and RNAi were used to estimate the antitumor capability and to identify the underlying mechanisms of paclitaxel in GCTB. RESULTS: Our data revealed that paclitaxel had significant time-dependent effects on the viability and induced apoptosis of HS 737.T cells. RNA-seq and bioinformatics analysis showed that apoptosis, death receptor signaling pathway, TNF signaling pathway, and TP53 regulated transcription of cell death genes pathway were closely associated with paclitaxel in the treatment of GCTB. Western bolt results revealed that paclitaxel induced cleavage of Caspase-3 and PARP1, and increased the phosphorylation level of p53 in HS 737.T cells. RNAi results showed that the expression level of TP53INP1 was significantly decreased in HS737.T cells (the decrease was more than 70%). In addition, we found that the inhibitory ratios of paclitaxel on HS737.T cells deficient in TP53INP1 were less than in HS737.T cells with empty vector (19.88 and 40.60%, respectively). Hence, our data revealed that TP53INP1 regulated paclitaxel-driven apoptosis in HS737.T cells. CONCLUSION: Paclitaxel can significantly repress cell proliferation and induce apoptosis of HS 737.T cells through activating Caspase-3, PARP1, p53, and TP53INP1. Paclitaxel may be an effective drug in the management of GCTB.

Therapeutic benefits of neoadjuvant and post-operative denosumab on sacral giant cell tumor: a retrospective cohort study of 30 cases.

PURPOSE: Denosumab, a new monoclonal antibody that inhibits receptor activator for nuclear factor Kß ligand (RANKL), has recently been approved by FDA for the treatment of aggressive giant cell tumor of bone (GCTB). So we initiated this study to evaluate the clinical benifits of denosumab used preoperatively or postoperatively. METHODS: Patients diagnosed with classic sacral GCT without metastasis were included in this study. Patients were assigned into 3 groups according to the use of denosumab: control group 1, post-operative group 2 and neoadjuvant group 3. The latter two groups were treated with 120 mg of subcutaneous denosumab every 4 weeks with loading doses on days 8 and 15 of the first cycle. The primary endpoints were event-free-survival (EFS) and objective response rate (OPR) based on RECIST criteria. A system (MUD system) proposed by our center was applied to score the sacral nerve deficit changes before surgery in group 3. RESULTS: A total 30 patients (13 men and 17 women, mean age 34.7 years, range 15-56) were enrolled from April 2014 to July 2016. Group 1 included 10 patients, group 2 9 and group 3 11. The study ended in March 01, 2017, and followup ranged from 3 to 36 months (mean 18.3). Two patients with PET-CT showed SUV max uptake down to muscle tissue level. In the neoadjuvant group 3 7 patients had partial responses and 4 stable disease (ORR 63.6%; 95% CI 35-92). Most (80%) patients achieved significant improvement in pain and great relief in the bladder and bowel functions. In 4 patients the urocatheter was removed after neoadjuvant denosumab. CONCLUSION: Neoadjuvant therapy with denosumab can significantly relieve the symptoms and neurologic deficits.

Osteonecrosis of the Jaw and Rebound Hypercalcemia in Young People Treated With Denosumab for Giant Cell Tumor of Bone.

Context: Denosumab, an inhibitor of receptor activator of nuclear factor κ-B ligand, is an approved treatment of giant cell tumor of bone (GCTB) in adults and "skeletally mature" adolescents. Safety concerns include oversuppression of bone remodelling, with risk of osteonecrosis of the jaw (ONJ) and atypical femur fractures during treatment in adults and rebound hypercalcemia after treatment cessation in children. To date, ONJ has never been reported in children or adolescents. Objectives: To describe serious adverse effects during and following high-dose denosumab therapy in GCTB patients. Patients: Two adolescents (14 and 15 years) and a young adult (40 years) received fixed-dose denosumab for GCTB for 1.3 to 4 years (cumulative dose, 47 to 98 mg/kg), which was stopped because of development of ONJ in one adolescent and bilateral femoral cortical stress reactions in the young adult. All three patients developed rebound hypercalcemia with acute kidney injury 5.5 to 7 months after denosumab cessation. Results: The ONJ necessitated surgical debridement. Rebound hypercalcemia (serum calcium, 3.1 to 4.3 mmol/L) was unresponsive to hyperhydration alone, requiring repeated doses of calcitonin or intravenous bisphosphonate treatment. Hypercalcemia recurred in two patients within 4 weeks, with normal serum calcium profiles thereafter. All patients were naive to chemotherapy, radiotherapy, bisphosphonates, and corticosteroids and were metastases free, confirming the causative role of denosumab in these complications. Conclusion: These suppression-release effects of high-dose denosumab on bone remodeling raise questions about safety of fixed dosing and treatment duration. In young people, weight-adjusted dosing and safety monitoring during and after antiresorptive therapy is required.

Seguridad y eficacia del uso de denosumab para el tratamiento de tumor óseo de células gigantes, en pacientes con enfermedad metastásica / Safety and efficacy of the use of denosumab for the treatment of giant cell bone tumor in patients with metastatic disease

INTRODUCCIÓN: El presente documento expone la evaluación de la eficacia y seguridad del uso de denosumab para el tratamiento de tumor óseo de células gigantes (TOCG), en pacientes con enfermedad metastásica. En la actualidad, existe el Dictamen Preliminar de Evaluación de Tecnología Sanitaria N. ° 063-SDEPFYOTS-DETS-IETSI-2016, en el cual se evaluó la evidencia en relación al uso de denosumab como tratamiento para tumor óseo de células gigantes (TOCG) en pacientes con enfermedad localmente avanzada e irresecable. En dicho dictamen se definió irresecabilidad como toda enfermedad no tributaria de cirugía radical (e.g., amputación) por tamaño tumoral, localización, contraindicación quirúrgica, o decisión del paciente. Así, los desenlaces de eficacia de principal interés de dicho dictamen, y para los cuales se realizó la evaluación, fueron la calidad de vida (definida como consecuencia de lograrse la cirugía conservadora de miembro) y la respuesta objetiva (i.e., reducción del tumor). Luego de evaluar la evidencia disponible hasta ese momento, en el Dictamen Preliminar de Evaluación de Tecnología Sanitaria N. ° 063-SDEPFYOTS-DETS-IETSI-2016 se decide aprobar el uso de denosumab para dicho contexto. Por otro lado, se estima que alrededor del 5 % de los casos de TOCG agresivos y recurrentes suelen hacer metástasis hacia los pulmones, de los cuales del 1 al 3 % llegan a convertirse en tumores más agresivos. Así, surge la necesidad de evaluar el uso de denosumab en el contexto de enfermedad metastásica no tributaria a cirugía, en el cual, el principal objetivo de tratamiento es lograr un beneficio en términos de sobrevida global y calidad de vida para el paciente. Por tanto, el objetivo del presente dictamen fue evaluar la evidencia científica publicada hasta setiembre del 2017 con respecto al uso de denosumab para el tratamiento de tumor óseo de células gigantes, en pacientes con enfermedad metastásica no tributarios de manejo quirúrgico. TECNOLOGIA SANITARIA DE INTERES: Denosumab (Prolia, Xgeva) es un anticuerpo monoclonal totalmente humano, el cual se une específicamente al ligando del receptor activador para el factor nuclear kappa (RANKL, por sus siglas en inglés). El hueso está formado principalmente por dos tipos de células: los osteoblastos, los cuales se encargan de la formación y mineralización de la masa ósea y los osteoclastos, los cuales se encargar de la absorción de la masa ósea; a su vez dichos osteoclastos provienen de un proceso mediado por los osteoblastos (3) . RANKL es un mediador clave en la biología de los osteoclastos y se encuentra altamente expresado en las células estromales en el tumor óseo de células gigantes (4) . Por otro lado, las células gigantes (tipo osteoclastos) y sus precursores expresan los receptores RANK. Por lo tanto, denosumab al unirse a RANKL bloquea su unión con los receptores RANK, inhibiendo así el reclutamiento de las células gigantes de tipo osteoclasto, y finalmente evitando la destrucción del hueso (4). METODOLOGÍA: Se realizó una búsqueda de la literatura con respecto a la eficacia y seguridad del uso de denosumab para el tratamiento de tumor óseo de células gigantes, en pacientes con enfermedad metastásica no tributarios de manejo quirúrgico definitivo. Esta búsqueda se realizó utilizando los meta-buscadores: Translating Research into Practice (TRIPDATABASE) y National Library of Medicine (Pubmed-Medline). Adicionalmente, se realizó una búsqueda manual del listado de referencias bibliográficas de los estudios seleccionados a fin de identificar otros estudios que pudieran ser útiles para la presente evaluación. Por otro lado, se amplió la búsqueda revisando la evidencia generada por grupos internacionales que realizan revisiones sistemáticas (RS), evaluación de tecnologías sanitarias (ETS) y guías de práctica clínica (GPC), tales como la Cochrane Group, The National Institute for Health and Care Excellence (NICE), the Agency for Health care Research and Quality (AHRQ), The Scottish Medicines Consortium (SMC), y The Canadian Agency for Drugs and Technologies in Health (CADTH). Esta búsqueda se completó revisando publicaciones de grupos dedicados a la educación, investigación y mejora de la práctica clínica oncológica dentro de América y Europa, como The National Comprehensive Cancer Network (NCCN), The American Society of Clinical Oncology (ASCO) y The European Society of Medical Oncology (ESMO). Por último, se completó la búsqueda ingresando a la página web www.clinicaltrials.gov, para así poder identificar ensayos clínicos en elaboración o que no hayan sido publicados aún, y así disminuir el riesgo de sesgo de publicación. RESULTADOS: A la fecha, no existen ensayos clínicos que provean de evidencia directa en relación a la pregunta PICO de interés del presente dictamen. Luego de realizar una búsqueda actualizada y considerar los criterios de selección de la evidencia de acorde a las características de la pregunta PICO, se observó que a la fecha no existe nueva evidencia más allá de la identificada previamente en el Dictamen Preliminar de Evaluación de Tecnología Sanitaria N. ° 063-SDEPFYOTS-DETS-IETSI-2016, la cual se incluye en el presente dictamen a modo de evidencia indirecta. En relación a los desenlaces de eficacia de interés del presente dictamen, la evidencia indirecta incluida solo considera respuesta objetiva y tiempo hasta la progresión (considerado para fines de este dictamen como un proxy de sobrevida libre de progresión sin incluir muertes). Asimismo, también se evaluaron los eventos adversos. Sin embargo, los desenlaces de mayor relevancia para el paciente y de especial importancia en el contexto de enfermedad metastásica no tributaria de manejo quirúrgico, como son la sobrevida global y la calidad de vida, no fueron evaluados en dicha evidencia indirecta. Además, no queda claro si la respuesta objetiva observada y el tiempo hasta la progresión en una población que no encaja de manera precisa en la población de interés del presente dictamen, se traducen a un beneficio para el paciente en el contexto de enfermedad metastásica, más aún al no existir una evaluación de la calidad de vida. Así, se considera que los desenlaces de eficacia evaluados no brindan evidencia suficiente para sustentar el uso de denosumab en el contexto de enfermedad metastásica no tributaria de manejo quirúrgico. Adicionalmente, la guía de práctica clínica de National Comprehensive Cancer Network (NCCN) menciona dentro de sus alternativas de tratamiento para el TOCG metastásico irresecable (no tributaria de manejo quirúrgico), el uso de interferón alfa 2b, el cual se encuentra dentro del Petitorio Farmacológico de EsSalud. Esta alternativa de tratamiento esta gradada con la misma categoría de nivel de evidencia que denosumab, con lo cual se recomienda a los médicos valorar su posible uso para la población de interés del presente dictamen. CONCLUSIÓN: El Instituto de Evaluación de Tecnologías Sanitarias-IETSI no aprueba el uso de denosumab para el tratamiento de tumor óseo de células gigantes, en pacientes con enfermedad metastásica no tributarios de manejo quirúrgico.

Reemplazo articular en tumor de células gigantes. Reporte de ocho casos / Joint replacement and giant-cell tumor. Report of 8 cases

Resumen: Introducción: El tumor de células gigantes es una neoplasia agresiva, representa aproximadamente entre 5 y 8.6% de los tumores óseos primarios. Más de 50% afecta la rodilla, pero puede afectar la totalidad de los huesos. Objetivo: Se exponen ocho casos candidatos a amputación a los que se propuso reemplazo articular como una alternativa de salvamento. Material y métodos: Se presentan ocho casos diagnosticados histopatológicamente en cadera y rodilla candidatos a amputación referidos por otros servicios. Se realizó resección en bloque y reemplazo articular de tipo tumoral de rodilla y cadera. Resultados: La evolución clínica y radiológica fue satisfactoria, se obtuvo buen resultado en los ocho casos sin complicaciones transoperatorias y postoperatorias, siendo lo más importante el salvamento de la extremidad pélvica con una mejor calidad de vida. Se muestran los resultados funcionales de las prótesis. Discusión: Son casos de salvamento de la extremidad con tumores destructivos en los que se evita la amputación con una recuperación de su vida normal en 80%.

Abstract: Introduction: The giant-cell tumor is an aggressive neoplasia, represents approximately from the 5 the 8.6% of primary bone tumors; more of 50% affects the pelvic extremity, being able to affect the totality of the bones. Objective: To present the case series of tumors around the knee and hip that we offered a tumoral joint replacement as an alternative to amputation. Material and methods: We present eight cases of extensive giant cells tumors, we did en bloc resection and tumoral joint replacement. Results: The clinical and radiological evolution was satisfactory, without postoperative complications and the most important, avoided an amputation with a better quality of life. Discussion: Alternative reconstructive treatment option with a recovery to its normal life in a 80% and a low index of complications.

Benign Tumors of the Spine: Has New Chemotherapy and Interventional Radiology Changed the Treatment Paradigm?

STUDY DESIGN: Clinically based systematic review. OBJECTIVE: To determine the role of (A) medical treatment and (B) interventional radiology as either adjuvant or stand-alone treatment in primary benign bone tumors of the spine. METHODS: A multidisciplinary panel of spine surgeons, radiation oncologists, and medical oncologists elaborated specific focused questions regarding aneurysmal bone cyst, giant cell tumor, and osteoid osteoma. Denosumab, bisphosphonate, interferon, bone marrow aspirate, doxycycline, thermal ablation, and selective arterial embolization were identified as areas of interest for the article. A systematic review was performed through MEDLINE and EMBASE. Recommendations based on the literature review and clinical expertise were issued using the GRADE system. RESULTS: The overall quality of the literature is very low with few multicenter prospective studies. For giant cell tumor, combination with Denosumab identified 14 pertinent articles with four multicenter prospective studies. Nine studies were found on bisphosphonates and six for selective arterial embolization. The search on aneurysmal bone cyst and selective arterial embolization revealed 12 articles. Combination with Denosumab, Doxycycline, and bone marrow aspirate identified four, two, and three relevant articles respectively. Eleven focused articles were selected on the role of thermal ablation in osteoid osteoma. CONCLUSION: Alternative and adjuvant therapy for primary benign bone tumors have emerged. Their ability to complement or replace surgery is now being scrutinized and they may impact significantly the algorithm of treatment of these tumors. Most of the data are still emerging and further research is desirable. Close collaboration between the different specialists managing these pathologies is crucial. LEVEL OF EVIDENCE: N/A.

Use of warm Ringer's lactate solution in the management of locally advanced giant cell tumor of bone.

BACKGROUND: This study was conducted to discover the effectiveness and safety of using warm Ringer's lactate solution (RLS) as a local treatment in the management of locally advanced giant cell tumor of bone with marked soft tissue invasion, including nearby neurovascular bundles. PATIENTS AND METHODS: This was a longitudinal cohort study with an average follow-up period of 4.6 ± 0.3 years, ranging from 4.2 to 5.9 years. There were 21 patients (9 male and 12 female), with the ages of subjects ranging from 12 to 64 years. Eight patients (38 %) were tumor recurrence cases. Pathological fracture was found in 15 patients (71 %). After extended curettage, warm RLS (50 °C) was locally applied for 20 min. Bone stabilization and reconstruction were then performed. RESULTS: All patients survived the operation. No additional neurovascular injury resulting from the use of warm RLS was found. Patients who had neurological deficit before the operation experienced significant improvement in motor and sensory function during the follow-up period. Complication was found in one patient (5 %). Two patients (9.5 %), had tumor recurrence and 19 patients (90.5 %) were tumor-free with good to acceptable function. CONCLUSION: Use of warm Ringer's lactate solution as an adjunctive local treatment during intra-lesional curettage of giant cell tumor with locally soft tissue extension was found to be safe with relatively low recurrence rate. However, additional studies to identify the optimum thermoablation dose at each part of the body should be undertaken before this technique can be used as a standard treatment.

[Joint replacement and giant-cell tumor. Report of 8 cases]. / Reemplazo articular en tumor de células gigantes. Reporte de ocho casos.

INTRODUCTION: The giant-cell tumor is an aggressive neoplasia, represents approximately from the 5 the 8.6% of primary bone tumors; more of 50% affects the pelvic extremity, being able to affect the totality of the bones. OBJECTIVE: To present the case series of tumors around the knee and hip that we offered a tumoral joint replacement as an alternative to amputation. MATERIAL AND METHODS: We present eight cases of extensive giant cells tumors, we did en bloc resection and tumoral joint replacement. RESULTS: The clinical and radiological evolution was satisfactory, without postoperative complications and the most important, avoided an amputation with a better quality of life. DISCUSSION: Alternative reconstructive treatment option with a recovery to its normal life in a 80% and a low index of complications.

INTRODUCCIÓN: El tumor de células gigantes es una neoplasia agresiva, representa aproximadamente entre 5 y 8.6% de los tumores óseos primarios. Más de 50% afecta la rodilla, pero puede afectar la totalidad de los huesos. OBJETIVO: Se exponen ocho casos candidatos a amputación a los que se propuso reemplazo articular como una alternativa de salvamento. MATERIAL Y MÉTODOS: Se presentan ocho casos diagnosticados histopatológicamente en cadera y rodilla candidatos a amputación referidos por otros servicios. Se realizó resección en bloque y reemplazo articular de tipo tumoral de rodilla y cadera. RESULTADOS: La evolución clínica y radiológica fue satisfactoria, se obtuvo buen resultado en los ocho casos sin complicaciones transoperatorias y postoperatorias, siendo lo más importante el salvamento de la extremidad pélvica con una mejor calidad de vida. Se muestran los resultados funcionales de las prótesis. DISCUSIÓN: Son casos de salvamento de la extremidad con tumores destructivos en los que se evita la amputación con una recuperación de su vida normal en 80%.

Autologous Platelet Gel Improves Bone Reconstruction of Large Defects in Patients with Bone Giant Cell Tumors.

BACKGROUND/AIM: Giant cell tumors are mostly benign but locally aggressive tumors. The excision of bone tumors can result in large defects, therefore bone reconstruction is still one the most demanding procedures in orthopedic surgery. Our study addresses the opportunity for improving surgical outcome by employing ß-tricalcium phosphate (ß-TCP) with platelet-rich plasma (PRP) at the surgical site. PATIENTS AND METHODS: We included 16 patients with giant cell tumors. After adjuvant therapy, the cavity was reconstructed with ß-TCP, bone graft material (ActifuserR Granules Baxter) and platelet gel application. RESULTS: Our explorative analysis suggests a positive effect of PRP on surgical outcome in patients with giant cell tumors treated with curettage. CONCLUSION: Use of platelet gel as an adjuvant significantly reduces the time required for bone healing following intralesional treatment of benign giant cell tumors, and achieves good functional results without promoting local recurrence.

Effects of thermoablation with or without caffeine on giant cell tumour of bone.

PURPOSE: To evaluate the effect of caffeine on the apoptosis rate of giant cell tumour of bone cells during thermoablation. METHODS: Giant cell tumour of bone tissue (2 cm3) was collected from 10 patients. Cells were incubated at 37ºC, 40ºC, 45ºC, 50ºC, 52.5ºC, and 55ºC for 20 minutes (3 tubes for each temperature). Caffeine was added to the tubes in amounts of 0 µg/ml (control), 50 µg/ml, and 100 µg/ml. The apoptotic effect of thermoablation with or without caffeine was evaluated. RESULTS: In all test conditions, the apoptotic rate of tumour cells increased when the temperature increased. Compared with controls (no caffeine), adding 50 or 100 µg/ml of caffeine did not increase the apoptotic rate significantly at 40ºC to 52.5ºC. Caffeine had no enhancing effect at any temperature. Conversely, at 55ºC, the apoptotic rate was lower when 100 µg/ml of caffeine was added than when no or 50 µg/ml of caffeine added (p=0.045). CONCLUSION: Thermoablation at 40ºC to 52.5ºC for 20 minutes increased the apoptosis rate of giant cell tumour of bone cells. Caffeine had no enhancing effect at any temperature. Conversely, at 55ºC, caffeine had cytoprotective effects on the tumour cells against thermoablation.

An eggshell-like mineralized recurrent lesion in the popliteal region after treatment of giant cell tumor of the bone with denosumab.

We report a case of recurrent giant cell tumor of the bone (GCTB) in which treatment with denosumab gradually enhanced the eggshell-like mineralization at the periphery of the tumor. A 28-year-old male presented with a mass on his left distal femur that had enlarged within the past few months. Before curettage, GCTB of the distal femur was diagnosed based on histological analysis of a biopsy specimen; the tumor consisted of a proliferation of ovoid mononuclear stromal cells with evenly scattered multinucleated osteoclast-like giant cells. The tumor recurred three times after the initial diagnosis; at the time of the third relapse, the patient underwent en bloc resection and reconstruction with a knee joint prosthesis. He was also treated with denosumab postoperatively because some studies have recently shown the benefits of the receptor activator of nuclear factor kappa-B ligand (RANKL) inhibitor denosumab as adjuvant therapy in patients with GCTB. Six months after starting adjuvant treatment with denosumab, radiography revealed a mineralized nodule >2 cm in diameter at the popliteal region; this lesion was considered a soft tissue recurrence of GCTB. Treatment with denosumab was continued for another 1.5 years, and the lesion was resected. Histological examination showed residual mononuclear stromal cells expressing RANKL without multinucleated giant cells surrounded by the peripheral mineralization. The patient was successfully treated by complete resection with the support of adjuvant treatment with denosumab.

Stimulation of osteogenic differentiation in stromal cells of giant cell tumour of bone by zoledronic acid.

Therapeutic effects of zoledronic acid (ZOL) on giant cell tumour of bone (GCT) have been proven. Apoptosis induction was considered to be one of the mechanisms of ZOL tumour inhibition. In this study, we presented the possibility of an osteogenic differentiation stimulation mechanism of ZOL and further investigated dosage and time effects. We treated stromal cells of GCT (GCTSC) with ZOL for 48 hours at different concentrations (0 µM, 0.01 µM, 0.1 µM, 1 µM, 5 µM, 30 µM) and assessed apoptotic and osteogenic differentiation markers with immunohistochemical techniques and real-time quantitative RT-PCR. Our results suggested that ZOL enhanced mRNA expression of Cbfa-1, osterix and osteocalcin genes with a maximum effect at 1 µM in GCTSC. Time course experiments indicated a time dependent osteogenic differentiation effect. In conclusion, ZOL may be considered as an adjuvant in the treatment of GCT not only by inducing apoptosis but also by stimulating osteogenic differentiation of remaining tumor stromal cells after surgery.

Pamidronate, farnesyl transferase, and geranylgeranyl transferase-I inhibitors affects cell proliferation, apoptosis, and OPG/RANKL mRNA expression in stromal cells of giant cell tumor of bone.

Giant cell tumor (GCT) is the most common nonmalignant primary bone tumor reported in Hong Kong. It usually affects young adults between the ages of 20 and 40. This tumor is well known for its potential to recur following treatment. To date no effective adjuvant therapy exists for GCT. Our project aimed to study the effects of pamidronate (PAM), farnesyl transferase inhibitor (FTI-277), geranylgeranyl transferase inhibitor (GGTI-298), and their combinations on GCT stromal cells (SC). Individual treatment with PAM, FTI-277, and GGTI-298, inhibited the cell viability and proliferation of GCT SC in a dose-dependent way. Combination of FTI-277 with GGTI-298 caused synergistic effects in reducing cell viability, and its combination index was 0.49, indicating a strong synergism. Moreover, the combination of FTI-277 with GGTI-298 synergistically enhanced cell apoptosis and activated caspase-3/7, -8, and -9 activities. PAM induced cell-cycle arrest at the S-phase. The combination of PAM with GGTI-298 significantly increased OPG/RANKL mRNA ratio and activated caspase-3/7 activity. Our findings support that the combination of bisphosphonates with GGTIs or FTIs with GGTIs may be used as potential adjuvants in the treatment of GCT of bone.

The efficacy of chemical adjuvants on giant-cell tumour of bone. An in vitro study.

Various chemicals are commonly used as adjuvant treatment to surgery for giant-cell tumour (GCT) of bone. The comparative effect of these solutions on the cells of GCT is not known. In this study we evaluated the cytotoxic effect of sterile water, 95% ethanol, 5% phenol, 3% hydrogen peroxide (H(2)O(2)) and 50% zinc chloride (ZnCI(2)) on GCT monolayer tumour cultures which were established from six patients. The DNA content, the metabolic activity and the viability of the cultured samples of tumour cells were assessed at various times up to 120 hours after their exposure to these solutions. Equal cytotoxicity to the GCT monolayer culture was observed for 95% ethanol, 5% phenol, 3% H(2)O(2) and 50% ZnCI(2). The treated samples showed significant reductions in DNA content and metabolic activity 24 hours after treatment and this was sustained for up to 120 hours. The samples treated with sterile water showed an initial decline in DNA content and viability 24 hours after treatment, but the surviving cells were viable and had proliferated. No multinucleated cell formation was seen in these cultures. These results suggest that the use of chemical adjuvants other than water could help improve local control in the treatment of GCT of bone.

[Maxilla-mandibular brown tumors as a first sign of parathyroid adenoma]. / Tumeurs brunes maxillomandibulaires révélant un adénome parathyroïdien.

OBJECTIVES: Through a novel observation of parathyroid adenoma revealed by brown tumors of the jaws and a review of the literature, the authors describe this rare mode of primary hyperparathyroidism discovery. MATERIAL AND METHODS: The patient was a 23-year-old woman who consulted for a recurrent tumefaction of the maxillary; histology showed reparative giant cell granuloma. RESULTS: The clinical examination found an osseous tumefaction in continuity with the zygomatic bone and a gingival tumefaction on the mandible symphysis. The radiological findings showed two osteophytic lesions: mandibular and maxillary. The phosphocalcic metabolism was disturbed and the parathormone rate was high. The etiologic search consisted of a MRI of the neck, which showed a mass behind the thyroid gland, suggesting a parathyroid adenoma. The diagnosis was confirmed at surgical exploration. After removal of this tumor, the blood calcium rate dropped sharply and the bone tumefaction progressively regressed. CONCLUSION: Brown tumors are a rare mode of parathyroid adenoma discovery, and the jaw location is exceptional. The diagnosis is based on the parathormone rate, and radiological exams generally find the etiology. Treatment is based on surgery of the parathyroid adenoma.