Giant cell tumor (GCT) of bone is an aggressive benign tumor accounting for 5% and 20% of primary bone tumors in Western and Chinese populations respectively [1, 2, 4, 31]. Extended intralesional curettage, which includes high-speed burring, is the primary treatment option for many patients with GCT. With such treatment, however, local recurrence is relatively frequent, with reported incidences as much as 12%-50% [14, 15, 28]. To decrease the risk of postcurettage recurrence, several types of local adjuvant treatments, such as use of polymethylmethacrylate, phenol, or liquid nitrogen, have been considered [10, 11, 14, 19, 20, 24]. Since the 1960s, cryotherapy by use of liquid nitrogen as the cryogenic source has been used in adjuvant treatment of some musculoskeletal tumors, including GCT, and showed that it is useful in reducing recurrence but is associated with complications related to the freezing [17, 18, 22, 23, 29, 37, 39].
The mechanisms of cryoablation-mediated cell death have been studied [6, 12, 13, 27, 37]. In brief, rapid freezing induces intracellular ice crystallization and propagation of ice mediates mechanical stress, which causes damage to cellular organelles. The resulting ice recrystallization is accompanied by slow thawing that mediates further damaging stress. To achieve a promising lethal effect on tumor cells, minimum intracellular freezing of −50° C to −70° C and a freezing rate greater than −20° C per minute are advised . In addition, thawing slower than 10°C per minute is required [7, 8, 37]. The ultimate goal is to eradicate tumor cells without damage to the adjacent healthy tissues. Directly pouring a cryogenic source such as liquid nitrogen into the surgical bone cavity was first introduced by Marcove  and Marcove et al. [18, 19], and was reported to be an effective procedure. As a result of easy accessibility and cost-effectiveness, Marcove's method remains the standard procedure for adjuvant cryotherapy in the treatment of certain aggressive but benign or low-grade bone tumors. However, this treatment is associated with local complications like fracture in as many as 42% of patients ; less commonly, skin necrosis and nerve palsy have been reported . These problems have caused investigators to question the merits of this approach [2, 23, 37]. Complications of liquid nitrogen treatment may be caused directly by spills or overflow of the liquid, or by liquid nitrogen's profound freezing effect (−196° C) damaging the adjacent normal tissues. To avoid some of the disadvantages associated with the use of directly pouring liquid nitrogen into a tumor cavity after curettage, we explored the development of a novel cryogenic material, freezing nitrogen ethanol composite, which exhibits similar cooling effects in a semisolid phase, thus avoiding the need to pour the freezing liquid into the surgical field.
Specifically, we asked the following questions: (1) Is freezing nitrogen ethanol composite-mediated freezing effective for tumor cryoablation in an ex vivo model, and if yes, is apoptosis involved in the tumor-killing mechanism? (2) Does freezing nitrogen ethanol composite treatment block neovascularization and neoplastic progression of the grafted GCT and is it comparable to that of liquid nitrogen in an in vivo chicken model? (3) Can use of freezing nitrogen ethanol composite as an adjuvant to curettage, result in successful short-term treatment, defined as absence of GCT recurrence at a minimum of 1 year in a small proof-of-concept clinical series?
Materials and Methods
Semisolid freezing nitrogen ethanol composite was freshly prepared by mixing ethanol and liquid nitrogen in a ratio of 1:3 before use (Fig. 1) (Video 1. Supplemental materials are available with the online version of CORR®.).
To verify the freezing temperature over the surface directly contacting the liquid nitrogen or freezing nitrogen ethanol composite, measurement was conducted by immersing a calibrated thermocouple in the liquid nitrogen and freezing nitrogen ethanol composite preparation (Fig. 2). To show the isothermal conduction across bone tissue, a thermocouple was introduced into the cavity center of a piece of porcine bone tissue (10 ± 0.50 mm thick; 2 ± 0.27 mm cortical; and 8 ± 0.46 mm cancellous). Entirely liquid nitrogen- or freezing nitrogen ethanol composite-embedded tissues were verified (Fig. 2C). The temperature was recorded every 30 seconds and the final time was reached at 10 minutes. The cooling rate was determined by dividing the temperature difference between room temperature and the target temperature (−60° C) by the required cooling time in minutes. Reference freezing parameters effectively lethal to tumor cells were plotted (green) in accordance with prior work . A freezing rate of −20° C per minute has been associated with cellular dehydration and intracellular ice crystallization [7, 8].
With the approval of the institutional review board, the cryoablation mediated on human GCT tissue was further compared between the treatments of freezing nitrogen ethanol composite preparation and liquid nitrogen. The GCT tissue was freshly collected from three patients and then cut into a 1-cm3 block. Three experiment groups were respectively exposed to ethanol (ethanol 30 seconds and ethanol 5 minutes), liquid nitrogen (liquid nitrogen 30 seconds and liquid nitrogen 5 minutes), and freezing nitrogen ethanol composite (freezing nitrogen ethanol composite 30 seconds and freezing nitrogen ethanol composite 5 minutes) for two times, followed by 15 minutes of thawing. No treatment was the negative control.
To identify the histologic changes mediated by freezing nitrogen ethanol composite or liquid nitrogen treatment, the standard protocol for preparing hematoxylin and eosin staining was used. To quantitate the effectiveness of cryotreatment on tumor cells, the nucleated area of tumor stromal cells under microscopic observation (×100) was characterized and calculated using GraphPad Prism 6 software (Graph Pad Software, La Jolla, CA, USA). The cellular length of multinucleated osteoclast-like giant cells also was measured. Multiple pairwise data comparing intergroup differences were examined by one-way ANOVA and the multiple comparisons were calculated by Bonferroni correction (post hoc test).
Genomic DNA fragmentation resulting from an apoptotic signaling cascade can be detected by staining on the DNA nick-recognizing enzyme, terminal deoxynucleotidyl transferase (TdT). A standard method, terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick labeling (TUNEL), can be used for quantitative measurement on apoptotic cells exhibiting DNA fragmentation. A generally accepted protocol has been reported . Branded kits are commercially available for ensuring the consistency of the TUNEL assay. In the current study, the procedures of the TUNEL assay were done as per the instruction manual available from the In Situ Cell Death Detection kit (POD; Roche, Basel, Switzerland), followed by microscopic counting (×400).
The levels of proteins involved in the signaling cascade that regulate programmed cell death were examined by Western blotting assay. The levels of three critical regulatory proteins including caspases 3, 8, and 9 and their inactive precursors were analyzed. Whole cell proteins were extracted for study and Western blotting assay was performed as the standard procedure. Chemiluminescence was detected by using the UVP BioSpectrum® 600 Image System™ (UVP LLC, Upland, CA, USA).
Chicken embryo chorioallantoic membrane assay is a well-established in vivo model to examine the angiogenesis along with tumor progression. The reliability of the chicken chorioallantoic membrane model has been validated for investigation of the progression and invasiveness of human GCT . It also has been affirmed that rapid self-renewing human multipotent mesenchymal bone marrow stromal cells actively adhere to arterial endothelium in a chicken chorioallantoic membrane model [3, 21]. In particular, the chicken chorioallantoic membrane model has been used for evaluating the efficacy of pharmacologic treatment on GCTs by determining the level of angiogenesis . In the current study, we used a previously published method [3, 16, 32] to develop tumor nodules in the chicken chorioallantoic membrane, and then treated them with liquid nitrogen or freezing nitrogen ethanol composite. Primary GCT stromal cells were obtained from fresh tissue of five patients with GCT after institutional review board approval and written consent. Cells isolated from the GCT tissue were cultured in the glutamine-containing Dulbecco's Modified Eagle Medium (DMEM, high glucose; Thermo Fisher Scientific, Waltham, MA, USA) supplemented with 10% fetal bovine serum and 1% penicillin and streptomycin stock solution (Thermo Fisher Scientific). After the third successive passage, the multinucleated giant cells were eliminated from the culture. The remaining mesenchymal stromal cells were verified by a senior pathologist (PCHC) on microscopic morphologic evaluation. After multiple passages, the cultured cells were still highly viable and no senescence was shown, which supported the contention that these were tumor cells. Furthermore, the tumorigenicity of the cultured cells was verified by tumor nodule formation successive to a chicken chorioallantoic membrane inoculation. Fertilized eggs acquired from a local commercial hatchery were incubated in an automatic incubator at 37° C and minimum 50% humidity. On Day 11, Matrigel® (Corning Life Sciences, Tewksbury, MA, USA) containing GCT cells (1 × 106) was directly introduced onto the chicken chicken chorioallantoic membrane preparation. On Day 18, the growing histologically confirmed GCT nodules (confirmed by PCHC, data not shown) were collected from the chicken chorioallantoic membrane. A total of 15 of 20 inoculated GCT nodules that were obtained from origin chicken chorioallantoic membrane were randomly divided in three groups (n = 5 for each group) and then separately treated with liquid nitrogen or freezing nitrogen ethanol composite for 5 minutes, and the group without treatment was the negative control. Afterward, all 15 GCT grafts were transplanted in separate secondary 11-day chicken chorioallantoic membranes of fertilized chicken eggs. After 7 days incubation, images of the inoculated nodules were photographed and the number of blood vessels in the xenograft tumor was manually calculated for each group. In the end, the tumor graft-bearing chicken chorioallantoic membranes were embedded in paraffin wax and prepared for immunohistochemical analysis. Mouse antihuman nuclei (HuNu) monoclonal antibody (Merck Millipore, Darmstadt, Germany) was used as the primary antibody to detect the cells of human origin on the secondary chicken chorioallantoic membrane. Under microscopic observation, the HuNu-positive cells were identified and marked using GraphPad Prism 6 software and then manually counted by three observers (JYW, PCHC, and SCH) in a blind manner (×200). Intra- and interobserver reliability were measured and found to be consistent. Statistical analysis was performed as previously described.
Between December 2013 and December 2014, three surgeons (P-KW, C-FC, and W-MC) were involved in treating a total of 23 patients with GCT. All the participants were informed about the study before signing an informed consent. We excluded patients with recurrent disease (n = 3), receiving marginal margin resection (n = 3), unwilling to receive freezing nitrogen ethanol composite treatment (n = 3), and with tumors found in an axial location (n = 4) and upper limbs (n = 3). This left us with seven patients (five males and two females; 23 to 53 years old) who received adjuvant freezing nitrogen ethanol composite cryotherapy. Among the enrolled participants, GCT Grades I to III occurred in the tibia (n = 5, two distal and three proximal sites) or the femur (n = 2, distal site).
The surgical technique was performed under tourniquet control. After exposure of the involved bone tissue, a cortical window the size of the longest longitudinal dimension of the tumor was made. Gross tumor was removed by hand curettes followed by high-speed burring. Some residual tumor cells may remain. We used a warm water-perfused gauze pad to insulate the normal tissues adjacent to the surgical lesions. The freshly prepared semisolid freezing nitrogen ethanol composite was scooped into the lesion cavity. The exterior surface of the freezing nitrogen ethanol composite preparation may melt faster. The melted freezing nitrogen ethanol composite was removed and additional fresh freezing nitrogen ethanol composite was added to ensure a consistent semisolid status. At least 5 minutes of exposure to freezing nitrogen ethanol composite was ensured for the entire bone cavity. Finally, the freezing nitrogen ethanol composite-treated tissue was thawed for 15 minutes. Reconstruction was conducted using bone grafts and internal fixation as dictated by the nature of the lesions.
At postoperative Day 2, any intraoperative complications such as nerve injury and skin necrosis were recorded. Postoperative partial weightbearing and ROM training were prescribed for all participants. For the followup evaluations, radiographic images were obtained every 6 weeks until bone healing. Limb MR images were acquired at 6-month intervals during the first 2 postoperative years. Local recurrence and any postoperative complications including pathogenic fracture and infection were documented.
The average followup was 24 ± 4 months (range, 19-30 months), and no patients were lost to followup.
Freshly prepared freezing nitrogen ethanol composite achieved cooling levels consistent with tumor killing, as reported elsewhere [17, 23, 37], and apoptosis associated with freezing nitrogen ethanol composite treatment was observed in GCT cells, implying cell death. For the freezing nitrogen ethanol composite preparation, the temperature of the freezing nitrogen ethanol composite contact surface decreased to an average −102° C within 30 seconds and then toward −136° C at a cooling rate of −249° C per minute (Fig. 2B, blue). The freezing nitrogen ethanol composite froze throughout the bone tissue to −68° C at 150 seconds and to −122° C in 10 minutes (Fig. 2D, blue). Accordingly freezing nitrogen ethanol composite mediates a freezing effect across bone tissue at a cooling rate of −34° C per minute. However, liquid nitrogen conducted a freezing effect through the bone mass at a cooling rate of −86° C per minute and static freezing was achieved at approximately −185° C (Fig. 2B, red). In an ex vivo experiment, the freezing nitrogen ethanol composite revealed similar GCT morphologic changes, revealing cell shrinkage in comparison to that mediated by liquid nitrogen. Compared with the untreated samples, ethanol treatment resulted in cytoplasmic dehydration but the nuclear changes were not seen (Fig. 3A). Diminished cellular volume and expanded intercellular space were observed. Disappearance of intracellular lipid-containing organelles was illustrated by cytoplasmic vacuolation for 5 minutes of ethanol exposure. Edematous and myxoid changes of intercellular stroma in association with disrupted cell membrane and the cell-stroma junction were seen in the 30-second treatment on GCT bones by use of liquid nitrogen. Longer liquid nitrogen incubation caused irregular cell contour and severe disruption of collagenous stroma. The freezing nitrogen ethanol composite preparation also mediated loss of cellular fluid and cytoplasmic vacuolation. Longer freezing nitrogen ethanol composite exposure (5 minutes) resulted in severe edematous and myxoid changes of the stroma and dehydration and vacuolation similar to that produced by liquid nitrogen treatment. Changes in histologic morphologic features showed that liquid nitrogen and freezing nitrogen ethanol composite treatment led to shrinkage in the nuclei of stromal cells and the size of multinucleated osteoclast-like giant cells. Microscopic quantification (×100) showed that the proportion of nucleated stromal cells area was decreased at a rate of approximately 24% (22% ± 2% vs 16% ± 2%; p = 0.002) for 30-second exposure to liquid nitrogen and it was twice that (22% ± 2% vs 12% ± 1%; p < 0.0001) for the 5-minute exposure (Fig. 3B). However, freezing nitrogen ethanol composite preparation took 30 seconds to achieve a similar effect (22% ± 2% vs 13% ± 1%; p < 0.0001) mediated by directly pouring liquid nitrogen. Likewise, quantification on the cellular length of multinucleated osteoclast-like giant cells showed that liquid nitrogen (202 ± 45 μm; p = 0.006) and freezing nitrogen ethanol composite (169 ± 27 μm; p < 0.001) mediated more cellular shrinkage for 30 seconds of treatment and the effects were sustained to 5 minutes of exposure (Fig. 3C). The ethanol treatment (258 ± 85 μm; p > 0.05) did not show a difference compared with untreated cells on the histomorphologic image (Eth, Fig. 3C) at 5 minutes. Liquid nitrogen and freezing nitrogen ethanol composite resulted in apoptosis of GCT cells at 5 minutes (×400, liquid nitrogen, 100 ± 21 TUNEL positive cells, p < 0.0001; freezing nitrogen ethanol composite, 95 ± 13 TUNEL positive cells, p < 0.0001) compared with the control and ethanol treatment groups (Fig. 4A-B). Freezing nitrogen ethanol composite caused a greater level of apoptosis (×400; 42 ± 7 TUNEL-positive cells; p < 0.0001) compared with liquid nitrogen (x400; 77 ± 11 TUNEL- positive cells; p < 0.0001) at 30 seconds (Fig. 4B). Western blotting analysis showed changes in the level of apoptosis-regulating proteins after the treatment with liquid nitrogen and freezing nitrogen ethanol composite but not with the ethanol treatment (Fig. 4C). Densitometric quantification on images also showed that three cleaved enzymes, caspases 3, 8, and 9, involved in apoptosis activation were increased in liquid nitrogen (caspase 3, 333% ± 79%, p = 0.015; caspase 8, 223% ± 91%, p = 0.092; caspase 9, 320% ± 99%, p = 0.027) and freezing nitrogen ethanol composite (caspase 3, 342% ± 18%, p = 0.002; caspase 8, 359% ± 48%, p = 0.002; caspase 9, 237% ± 52%, p = 0.032) treatment groups at 30 seconds compared with the untreated control (Fig. 4D). The longer exposure (5 minutes) to either liquid nitrogen (529% ± 102%; p = 0.003) or freezing nitrogen ethanol composite (546% ± 54%; p < 0.001) led to a higher level of cleaved caspase 3. However, freezing nitrogen ethanol composite treatment resulted in greater levels of elevation of cleaved caspase 8 (443% ± 89% vs 322% ± 111%) than that of liquid nitrogen at 5 minutes (Fig. 4D). In addition, liquid nitrogen (289% ± 83%; p = 0.021) and freezing nitrogen ethanol composite-treated (260% ± 32%; p = 0.003) GCT tissues showed an enhanced ratio of Bax/Bcl2 at 30 seconds (Fig. 4D). Ethanol did not show an effect on the level of the three analyzed caspases.
Progression of grafted human GCT grown in the chicken chorioallantoic membrane was inhibited by freezing nitrogen ethanol composite treatment (Fig. 5A). In this study, the counted number of blood vessels showed that liquid nitrogen (mean, 2; range, 1-4; p < 0.001) and freezing nitrogen ethanol composite treatments (mean, 2; range, 1-3; p = 0.04) for 5 minutes inhibited the neovascularization induced by the untreated GCT (mean, 8; range, 7-12) in the chicken chorioallantoic membrane experiment (Fig. 5B-C). Quantitation on the HuNu-positive cells showed a higher amount of human-origin tumor (HuNu-positive) cells in the secondary chicken chorioallantoic membrane of negative controls (mean, 487; range, 361-641) than that of liquid nitrogen (mean, 50; range, 26-78; p < 0.0001) and freezing nitrogen ethanol composite (mean, 45; range, 30-60; p < 0.0001) treatment (Fig. 5D-E).
Preliminary clinical evaluation found no local recurrences, and no intra- or postoperative complications such as nerve injury, skin necrosis, or pathologic fractures that might be attributed to the freezing nitrogen ethanol composite treatment (Table 1). Radiographic images are shown for a representative 23-year-old male patient with GCT (Fig. 6) who underwent intralesional excision and adjuvant cryotherapy by freezing nitrogen ethanol composite cryotherapy.
GCT of bone has a prevalence of 20% of benign bone tumors in the US population . Intralesional curettage is considered a standard treatment of GCT, however, local recurrence has been reported to occur after curettage in 40%-50% of patients so treated compared with those who have en bloc excision (< 20%) . In conjunction with adjuvant cryotherapy such as the use of liquid nitrogen, the incidence of local recurrence has been reported to be lower (0%-3.2%) [33, 38]. Despite its advantages of being cost effective and easy to implement, the recommended extreme freezing temperatures of −196° C reached by direct pouring of liquid nitrogen into the cavity after curettage has been associated with complications such as bone fracture . In addition, severe evaporation occurs during the pouring procedures which increases the risk of coolant spillage that could lead to skin necrosis. Therefore, an effective freezing agent exhibiting a mild endothermic property and a higher viscosity could be advantageous by delivering the required freezing temperatures and reducing the complication rate. In the current study, a novel semisolid composite easily prepared by mixing ethanol and liquid nitrogen was used. Its use showed effective tumor-eradicating activity by achieving the desired freezing temperature and cooling rate in ex vivo and in vivo experiment models. A small series in a case-controlled pilot clinical study and short-term followup also provided supportive results for further clinical studies on a larger scale.
Several limitations for this study need to be addressed. Regardless of the liquid phase or semisolid coolant, gravity dependence needs to be considered. Vaporized liquid nitrogen spray could be an option to eliminate the concern. In practice, however, it is time consuming to achieve homogeneous distribution of the freezing effect for a larger surgical lesion. In addition, gas embolism has been reported in patients with GCT receiving liquid nitrogen spray . In particular, the risk is greater if the tumor is located in an area with high vascularization such as the metaphysis of long bones . Owing to the absence of available markers for the specific identification on human GCT cells, we did not have definitive evidence to confirm that the primary cultures were GCT cells. However, we did our best to verify the cell morphology by a senior pathologist's evaluation and show that they grew tumors when reinjected after passage. Unlike fibroblasts, the cultured human GCT cells retained tumor cell-like highly proliferative capacity. Furthermore, the passaged primary culture was transplanted to chicken chorioallantoic membrane and then progressed to tumor nodules that were further verified by histologic evaluation. Patients in this study were restricted to those with lower extremity lesions, such as in the distal femur and proximal tibia, where a pneumatic tourniquet was applied for the surgical procedures. However we have not yet included patients with GCT occurring at other locations such as the proximal humerus, sacrum, and proximal femur where a tourniquet cannot be applied. Therefore the use of this method probably is restricted by the location of the GCT in selected patients. In the ex vivo experiment models, we were not able to simulate the physiologic conditions under surgery such as blood flow, body temperature, and connected soft tissues that may affect freezing being conducted. It could be a critical factor related to the tumor-killing efficacy and local recurrence. However, previous studies have shown a low recurrence rate in patients with GCT treated with liquid nitrogen [22, 23]. Our ex vivo and in vivo animal experiment data showed no difference in tumor effects measured between the use of liquid nitrogen and freezing nitrogen ethanol composite. Therefore the effect of the physiologic condition in surgical procedures is likely minimized. For the in vivo clinical evaluation, the quality of evidence was limited by the small number of participants and absence of control subjects. Furthermore, the duration of the followup, an average of 24 months, may not be long enough to cover late fracture and tumor recurrence. However, a previous study showed that the median duration of local recurrence was 23.1 months among 19 patients with GCT . Evaluation of the occurrence of perioperative complications was not limited by the duration of followup. However, a prospective clinical study design in larger cohorts and longer followup are required for further study.
Freezing nitrogen ethanol composite appears to effectively kill GCT cells similar to that mediated by liquid nitrogen. Our results showed a freezing rate of −249° C per minute on the surface immediately contacting the freezing nitrogen ethanol composite while the freezing rate was −34° C per minute for freezing throughout a 10-mm thick bone mass. Apparently freezing nitrogen ethanol composite fulfills the criteria of freezing rate (minimum −20° C per minute) for tumor cryoablation . In addition to the target freezing temperature, the freezing and thawing rates are critical for effective cryoablation [1, 7, 8]. Rapid freezing and slow thawing mediate intracellular ice crystallization and recrystallization generating shear stress on tumor cells. The recommended freezing rate is greater than −20° C per minute and a rate less than 10° C per minute is suitable for thawing [7, 8, 12]. We identified the involvement of apoptosis in the frozen GCT tissues. Cryoablation-mediated changes in apoptosis and morphologic features of tumor cells were compared between treatments of freezing nitrogen ethanol composite and liquid nitrogen. In this study, 5-minute freezing nitrogen ethanol composite treatment achieved comparable effects on morphologic shrinkage of osteoclast-like giant cells and the neoplastic stromal cells compared with that of liquid nitrogen. Histopathologic evaluation of a GCT section showed mononuclear, ovoid, or short spindle-like neoplastic stromal cells frequently mixing with large multinuclear osteoclast-like giant cells. The high incidence of recurrence after surgical removal likely results from residual stromal cells . Accordingly, we adopted a 5-minute exposure to freezing nitrogen ethanol composite for the patients treated in this study.
Regarding the regulatory molecules in the apoptotic signaling cascade, we observed consistent evidence that liquid nitrogen and freezing nitrogen ethanol composite mediated a substantial increase in the cleaved active caspases 3, 8, and 9 compared with that of the untreated control. DNA fragmentation and apoptosis were identified as a mechanism leading to cell death in cryotherapy-treated prostate and colorectal cancers  but have not been found in frozen bone tumors. However, the involvement of cascade proteocleaved activation of factors including caspases 3, 8, and 9 has been shown in the apoptotic signaling pathway of bone cells . The molecular aspects related to DNA fragmentation are consistent with the quantitative TUNEL assays in situ. Activation of caspase 8 is mediated by cellular death ligands (FasL/TRAIL) (extrinsic pathway), whereas Bcl2 family proteins regulate the expression of active caspase 9 (intrinsic pathway) . Active caspases 8 and 9 induce elevation of effector caspase 3 and consequently lead to cell death characterized by morphologic and biochemical alterations . The results of our study suggested that extrinsic and intrinsic apoptosis pathways are involved in freezing nitrogen ethanol composite- and liquid nitrogen-mediated cryoablation. In addition, the ratio of Bax/Bcl2 was substantially enhanced in the freezing nitrogen ethanol composite and liquid nitrogen treatment groups. It has been reported that the expression ratio of Bax/Bcl2 positively correlates to the apoptotic rate in the cryoablation-injured human colorectal cancer cells .
In this study, we showed that freezing nitrogen ethanol composite treatment exhibits a comparable effect to liquid nitrogen on inhibiting neovascularization and tumor growth derived from GCT xenografts. Transplanted GCT grafts growing in chicken chorioallantoic membrane of a fertilized egg have been used as a reliable in vivo model for investigation of angiogenesis and metastasis of GCT [3, 16, 34, 39].
As a preliminary attempt to see if our in vitro and ex vivo results would be useful in the clinical setting, we used adjuvant freezing nitrogen ethanol composite in the treatment of a small group of patients with GCT to evaluate the operational convenience and safety during surgery. In these seven patients, neither intraoperative complications such as neurovascular injuries and skin necrosis nor infection were observed. Additionally, there was no pathologic fracture or local recurrence during followup. We did not have a direct comparison group with an adjuvant or with standard liquid nitrogen application. Larger, comparative studies will be needed to confirm our preliminary findings and comment in greater detail regarding differences in safety among the available approaches.
Freezing nitrogen ethanol composite is a semisolid phase cryotherapy application that appears to offer appropriate thermal conduction and comparable ex vivo and in vivo GCT cryoablation compared with standard approaches of liquid nitrogen application. We also present preliminary clinical evidence that freezing nitrogen ethanol composite provides a convenient method of freezing during curettage procedures for GCT of the extremity. If confirmed in larger studies, this application of adjuvant cryotherapy might be considered in the treatment of benign aggressive or low-grade bone tumors such as GCT.
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