Preoperative radiation, surgical margins, and local control of extremity sarcomas of soft tissues

Factors Influencing Long-Term Local Recurrence, Distant Metastasis, and Survival in Patients with Soft Tissue Sarcoma of the Extremities Treated with Radiotherapy

INTRODUCTION

The prognostic factors for extremity soft-tissue sarcomas (ESTSs) treated with multimodal surgery and radiotherapy (RT) remain a subject of debate across diverse and heterogeneous studies.

METHODS

We retrospectively analyzed nonmetastatic ESTS patients treated with RT between 2007 and 2020 in Strasbourg, France. We assessed local control (LC), distant control (DC), overall survival (OS), and complications.

RESULTS

A total of 169 patients diagnosed with localized ESTS were included. The median age was 64 years (range 21-94 years). ESTS primarily occurred proximally (74.6%) and in the lower limbs (71%). Most tumors were grade 2-3 (71.1%), deep-seated (86.4%), and had R0 margins (63.9%). Most patients were treated with helical tomotherapy (79.3%). The median biologically effective dose (BED) prescribed was 75 BEDGy4 (range 45.0-109.9). The median follow-up was 5.5 years. The 5- and 10-year LC, DC, and OS rates were 91.7%, 76.8%, and 83.8% and 84.2%, 74.1%, and 77.6%, respectively. According to the univariate analysis, LC was worse for patients who received less than 75 BEDGy4 (p = 0.015). Deep tumors were associated with worse OS (p < 0.05), and grade 2-3 and undifferentiated pleomorphic sarcoma (UPS) were linked to both shorter DC and shorter OS (p < 0.05). IMRT was associated with longer LC than 3DRT (p = 0.018). Multivariate analysis revealed that patients with liposarcoma had better OS (p < 0.05) and that patients with distant relapse had shorter OS (p < 0.0001).

CONCLUSION

RT associated with surgical resection was well tolerated and was associated with excellent long-term rates of LC, DC, and OS. Compared with 3DRT, IMRT improved local control. Liposarcoma was a favorable prognostic factor for OS. Intermediate- and high-grade tumors and deep tumors were associated with lower DC and OS.

[Predictive factors assessment of pathological response to neoadjuvant radiotherapy of soft tissue sarcomas]

PURPOSE

Conserving surgery combined with radiotherapy in presence of local recurrence risk factors is standard treatment of soft tissue sarcomas, a group of rare and heterogeneous tumours. Radiotherapy is performed before or after surgery. In neoadjuvant setting, late radiation-induced toxicity is reduced and pathological response to radiotherapy could be achieved. A complete pathological response to radiotherapy has recently been shown to predict better survival. Our study aims at identifying predictive factors of pathological response to neoadjuvant radiotherapy (clinical, radiological or histological) of soft tissue sarcomas.

PATIENTS AND METHODS

Clinical, imaging (MRI: perilesional oedema, necrosis, tumour heterogeneity, vasculonervous relationships) and pathological (pathological subtype, tumour grade, anticipated/obtained resection quality) data were retrospectively collected. Tumour response (imaging and pathological), patient outcome, acute and late radiation-induced toxicity, predictive factors of pathological response to neoadjuvant radiotherapy were studied. The 2-test or exact-Fisher test (qualitative variables) and by Student's t-test or Kruskal-Wallis test (quantitative variables) were used for statistical analysis.

RESULTS

From April 2017 to April 2021, neoadjuvant radiotherapy (50Gy in 25 fractions) followed by surgical excision was performed to 36 consecutive patients with liposarcomas (n=17/36), or undifferentiated sarcomas (n=8/36). MRI response was complete in 1 patient, partial in 9 patients (n=9/36, 25%), stable in 21 patients (n=21/36, 58%) or in progression in 5 patients (n=5/36, 14%). Pathological response was observed in 22 patients (61%). No grade 3-4 acute radiation-induced toxicity was observed. Regarding late toxicity, 28% of patients had grade 1-2 oedema (n=10/36), 39% had a grade 1 fibrosis (n=14/36), and 30% grade 1 pain (n=11/36). No predictive factors of response to radiotherapy was statistically significant.

CONCLUSIONS

Neoadjuvant radiotherapy is well-tolerated. No clinical, radiological or pathological predictive factors was identified for radiotherapy tumour response.

Prognostic Factors in Extremity Soft Tissue Sarcomas Treated with Radiotherapy: Systematic Review of the Literature

Soft tissue sarcomas of the extremities are rare tumors with various prognostic factors. Their management is debatable due to their inconsistent results within the literature and the lack of large prospective studies. The objective of this systematic review is to analyze the available scientific data on prognostic factors concerning the characteristics of the patients, the disease and the treatments performed, as well as their potential complications, on studies with a median follow-up of 5 years at minimum. A search of articles following the "PRISMA method" and using the PubMed search engine was conducted to select the most relevant studies. Twenty-five articles were selected, according to preestablished criteria. This review provides a better understanding of the prognosis and disease outcome of these tumors. Many factors were described comparing the frequency of occurrence according to the studies, which remain heterogeneous between them. Significant factors that could orient patients to radiotherapy were highlighted. These positive prognostic factors provide valuable insight to optimize radiotherapy treatments for patients treated for soft tissue sarcoma of the extremities.

CivaSheet® use for soft tissue sarcoma: A single institution experience

OBJECTIVE

CivaSheet is a palladium-103, implantable, intraoperative radiation therapy device which emits unidirectional radiation that enables boost doses in patients who have otherwise received the maximum radiation dose. Here, we present our initial clinical experience with the first 10 cases using this new technology.

METHODS AND MATERIALS

A retrospective chart review of all patients with STS treated with surgical resection and CivaSheet placement at the University of Miami Hospital, a tertiary care center, from January 2018 to December 2019, was performed. Adjuvant radiation was administered by a palladium-103 implant, which delivered an average of 47 Gy (35-55) to a depth of 5 mm.

RESULTS

Nine patients underwent CivaSheet placement from January 2018 until December 2019 for a total of 10 CivaSheets placed (1 patient had 2 CivaSheets inserted) and followed for a mean of 27 months (4-45 months). Four tumors were located in the retroperitoneum, two in the chest, two in the groin, and two within the lower extremity. At the time of tumor resection and CivaSheet placement, tumor sizes ranged from 2.5 cm to 13.8 cm with an average of 7.6 cm. Four patients necessitated musculocutaneous tissue flaps for closure and reconstruction. All patients with Grade 4 complications had flap reconstruction and prior radiation. Four patients' tumors recurred locally for a local recurrence rate of 40%. Three patients had modified accordion Grade 4 complications necessitating additional surgery for CivaSheet removal. Extremity tumors unanimously developed modified accordion Grade 4 adverse events.

CONCLUSIONS

CivaSheet may be an acceptable alternative treatment modality compared to prior brachytherapy methods.

Oncologic outcomes in myxofibrosarcomas: the role of a multidisciplinary approach and surgical resection margins

BACKGROUNDS

Myxofibrosarcomas (MFS) are malignant soft tissue sarcomas with an infiltrative growth pattern and propensity for local recurrence(LR).We aimed to assess our management of MFS and make recommendations about the role of a multidisciplinary team approach and margin widths.

METHODS

Fifty-seven patients were identified with MFS treated at a single sarcoma centre between 1998 and 2020. Patients were stratified based on whether they presented for a planned resection (59.6%) or after an unplanned resection (40.4%) performed at a non-specialized facility. All patients underwent radiotherapy before definitive surgery.

RESULTS

73.7% underwent a combined onco-plastic approach. The 5 year LRFS rate was 78.2% (84.4%, planned, versus 70.1%, unplanned, P = 0.194) and found comparable oncological outcomes between the planned and unplanned groups for the 5 year metastasis free survival (74.5% versus 86.1%, P = 0.257), disease free survival (70.1% versus 72.4%, P = 0.677), and Overall Survival (64.5% versus 75.9%, P = 0.950). Margin width ≥ 2 cm was obtained in 84.2% of cases and improved local control (HR = 0.22; 95% CI 0.06-0.81; P = 0.023), metastasis (HR = 0.24; 95% CI 0.07-0.80; P = 0.019) and mortality rates (HR = 0.23; 95% CI 0.09, 0.61; P = 0.003) compared to <2 cm. Margin width > 3 cm did not further affect oncological outcomes.

CONCLUSION

Our study shows that a multidisciplinary team approach allows the achievement of low local recurrence rate and good oncological outcomes of myxofibrosarcomas, regardless of presentation status. We recommend a minimum of 2 cm margin width.

The significance of margins in pediatric Non-Rhabdomyosarcoma soft tissue sarcomas: Consensus on surgical margin definition harmonization from the INternational Soft Tissue SaRcoma ConsorTium (INSTRuCT)

BACKGROUND

Margin status following surgery in children, adolescents, and young adults with soft tissue sarcomas is controversial and has been defined differently by various specialties, with definitions changing over time and by cooperative group. The International Soft Tissue Sarcoma Consortium (INSTRuCT) is a collaboration of the Children's Oncology Group (COG) Soft Tissue Sarcoma Committee, European pediatric Soft Tissue sarcoma Study Group (EpSSG), and the European Cooperative Weichteilsarkom Studiengruppe (CWS) devoted to improving patient outcomes by pooling and mining cooperative group clinical trial data.

METHODS

The INSTRuCT non-rhabdomyosarcoma soft tissue sarcoma (NRSTS) working group aimed to develop international harmonized recommendations regarding surgical margin assessment and definitions in children and adolescents with soft tissue tumors.

RESULTS AND CONCLUSION

This review addresses accepted principles and areas of controversy, including the perspectives of surgeons, pathologists, radiation oncologists, and pediatric oncologists, to develop a framework for building common guidelines for future research.

Soft Tissue Sarcomas of the Head and Neck Region with Skull Base/Intracranial Invasion: Review of Surgical Outcomes and Multimodal Treatment Strategies: A Retrospective Case Series

Soft tissue sarcomas (STS) invading the skull base are rare with little data to guide surgical management. Here we aimed to determine the factors affecting tumor control rates and survival in patients with T4 stage head and neck STS involving the skull base. A retrospective review of STS patients, surgically treated at our institution between 1994 and 2017 was conducted. Variables were collected and assessed against progression-free survival. Tumors were graded using the Fédération Nationale des Centres de Lutte Contre le Cancer (FNCLCC) system. A total of 51 patients (mean age of 35) were included, of whom 17 (33.3%) patients were FNCLCC grade 1, 8 (15. 7%) were FNCLCC grade 2 and 26 (51%) were FNCLCC grade 3. The median PFS was 236.4 months while the 5- and 10-year PFS rates were 44% and 17%, respectively. Recurrence occurred in 17 (33.3%) patients. Local recurrence occurred in 10 (58.8%). Univariate analysis revealed R0 resection had a near-significant impact on tumor control in radiation-naïve patients. Otherwise, prior radiation (HR 6.221, CI 1.236–31.314) and cavernous sinus involvement (HR 14.464, CI 3.326–62.901) were negative predictors of PFS. The most common cause of treatment failure was local recurrence. In T4 stage head and neck STS with skull-base involvement, FNCLCC grade, radiation status, and anatomic spread should be considered in determining the overall treatment strategy.

Adult Soft-Tissue Sarcomas of the Extremities

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Soft-tissue sarcomas (STS) in adults comprise a heterogeneous group of tumors of mesenchymal origin that share similar biological patterns of local tumor growth and metastatic dissemination.

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The judicious use of imaging studies, biopsy techniques, and pathological evaluations is essential for accurate diagnosis and for planning treatment strategy.

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Wide local resection and radiation therapy form the cornerstone of management of high-grade STS. The role of adjuvant radiation therapy is questionable in the management of small (≤5 cm) superficial lesions that can be resected with negative margins. Chemotherapy given to patients who have nonmetastatic, high-grade STS results in varying benefit in terms of local tumor control and overall survival.

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Coordinated care by a multidisciplinary team of trained surgeons, medical oncologists, radiologists, radiation oncologists, and pathologists has been documented to improve local tumor control and the overall survival of patients with STS.

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Although considerable progress in tumor diagnostics and targeted therapies has been made over the past 2 decades, recommendations and controversies relating to tumor imaging and margins of resection have not changed.

Refractory recurrent spinal chondrosarcoma: What is the role of salvage surgery?

BACKGROUND

The spinal chondrosarcoma has high risk of recurrence if the initial surgery is not performed in an en bloc fashion. It remains technically demanding to surgically manage the refractory recurrent spinal chondrosarcoma (RRSC). This study is to assess the clinical features and investigate the prognostic factors for patients with RRSCs.

METHODS

forty-nine patients with RRSCs underwent salvage surgeries in our institution, and the clinical characteristics were collected and recorded by two independent reviewers. Univariate and multivariate analyses were performed to investigate the independent prognostic factors of recurrence-free survival (RFS) and overall survival (OS) for patients with RRSCs.

RESULTS

During the mean follow-up of 31.7 ± 21.04 months (Range 9-93), the 3-year RFS and OS rate was 24.5% and 34.5%, respectively. According to the Cox proportional hazards regression model, wide excision with tumor-free margin (>4 mm) was associated with both better RFS and OS for patients with RRSCs. Meanwhile, the number of recurrences ≤2 was beneficial to RFS, while high pathological grade was correlated with worse OS.

CONCLUSIONS

Wide excision with tumor-free margin (>4 mm) is recommendable if appropriate in the salvage surgery for patients with RRSCs. Patients with number of recurrences ≤ 2 and lower pathological grade may have better RFS and OS, respectively.

Long-Term Follow-Up of Patients Receiving Neoadjuvant Treatment Modalties for Soft Tissue Sarcomas of the Extremities

BACKGROUND

Neoadjuvant treatment modalities in soft tissue sarcoma (STS) of the extremities have become more popular in recent years, but because of the rarity and heterogeneity of STS, there are yet few studies on the long-term impact of neoadjuvant treatment modalities, especially in terms of neoadjuvant radiochemotherapy.

METHODS

The study enrolled 136 patients with primary STS of the extremities who underwent surgery with curative intent or neoadjuvant therapy, followed by surgery in a 15-year period. Neoadjuvant treatment consisted of radiotherapy (RT) with 60 Gy and in most cases simultaneous chemotherapy (CTx) with ifosfamide (1.5 g/m²/d, d1-5, q28) and doxorubicine (50 mg/m²/d, d3, q28). We investigated the clinical, (post)-operative and histopathological data and the oncological follow-up as well. The median follow-up period was 82 months (range 6-202).

RESULTS

A total of 136 patients (M:F = 73:63) with a mean age of 62 years (range; 21-93) was observed. Seventy-four patients (54.4%) received neoadjuvant therapy (NT), 62 patients (45.6%) received primary surgery (PS). When receiving NT, patients with high-risk STS had a lower risk to develop distant metastasis (p = 0.025). Age, histological type, tumor size and surgical margins (R0 vs. R1) had no influence on any survival rates. There was an association between NT and the occurrence of postoperative complications (p = 0.001). The 5-year local recurrence free survival (LRFS), metastasis free survival (MFS), disease free survival (DFS) and overall survival (OS) rate of the whole cohort was 89.9%, 77.0%, 70.6% and 72.6%; whereas the 5-year LRFS, MFS, DFS and OS rate was 90.5%, 67.2%, 64.1% and 62.8% for the NT group and 89.5%, 88.3%. 78.4% and 83.8% for the PS group.

CONCLUSIONS

Multimodal treatment strategies in patients with STS of extremities lead to excellent oncological outcomes. Patients with high-risk STS had a significantly better MFS when receiving NT than patients with low-risk STS. NT was associated with a higher probability of postoperative but well-manageable complications.

American Brachytherapy Society (ABS) consensus statement for soft-tissue sarcoma brachytherapy

PURPOSE

Growing data supports the role of radiation therapy in the treatment of soft tissue sarcoma (STS). Brachytherapy has been used for decades in the management of STS and can be utilized as monotherapy or as a boost to external beam radiation. We present updated guidelines from the American Brachytherapy Society regarding the utilization of brachytherapy in the management of STS.

METHODS AND MATERIALS

Members of the American Brachytherapy Society with expertise in STS and STS brachytherapy created an updated clinical practice guideline including step-by-step details for performing STS brachytherapy based on a literature review and clinical experience.

RESULTS

Brachytherapy monotherapy should be considered for lower-recurrence risk patients or after a local recurrence following previous external beam radiation; a brachytherapy boost can be considered in higher-risk patents meeting implant criteria. Multiple dose/fractionation regimens are available, with determination based on tumor location and treatment intent. Techniques to limit wound complications are based on the type of wound closure; wound complication can be mitigated with a delay in the start of brachytherapy with immediate wound closure or by utilizing a staged reconstruction technique, which allows an earlier treatment start with a delayed wound closure.

CONCLUSIONS

These updated guidelines provide clinicians with data on indications for STS brachytherapy as well as guidelines on how to perform and deliver high quality STS brachytherapy safely with minimal toxicity.

Non-rhabdomyosarcoma soft-tissue sarcoma

Non-rhabdomyosarcoma soft-tissue sarcomas (NRSTS) comprise 4% of childhood cancers and consist of numerous histologic subtypes. Prognostic factors associated with poor outcome include high histologic grade, large tumor size, presence of metastases, and unresectability. Complete surgical resection is critical for the best oncologic outcomes and is prioritized in treatment algorithms. The use of radiation therapy (RT) and chemotherapy is based upon factors such as resectability, histologic grade, tumor size, and stage. North American and European trials are defining a risk-based approach to NRSTS to limit treatment-related toxicity and to maximize therapeutic efficacy. In this paper, we summarize the current roles of surgery, RT, and chemotherapy in NRSTS and describe ongoing research that is advancing the care of NRSTS patients.

Margin Assessment in Soft Tissue Sarcomas: Review of the Literature

Simple Summary

Many classifications to assess margins status for soft tissue sarcomas are reported in the literature. Most of the series are heterogeneous and variable in size, making it difficult to compare results from study to study. Thus, which is the best way to assess margins in order to predict the risk of local recurrence is still debated. The aim of this narrative review is to provide a comprehensive assessment of the literature on margins, and to highlight the need for a uniform description of the margin status for patients with soft tissue sarcomas (STS).

Abstract

Adequacy of margins must take into consideration both the resection margin width (quantity) and anatomic barrier (quality). There are several classification schemes for reporting surgical resection margin status for soft tissue sarcomas (STS). Most of the studies regarding treatment outcomes in STS included all histologic grades and histological subtypes, which include infiltrative and non-infiltrative subtypes and are very heterogeneous in terms of both histologic characteristics and treatment modalities (adjuvant treatments or not). This lack of consistency makes it difficult to compare results from study to study. Therefore, there is a great need for evidence-based standardization concerning the width of resection margins. The aim of this narrative review is to provide a comprehensive assessment of the literature on margins, and to highlight the need for a uniform description of the margin status for patients with STS. Patient cases should be discussed at multidisciplinary tumor boards and treatments should be individualized to clinical and demographic characteristics, which must include also a deep knowledge of specific histotypes behaviors, particularly infiltrative ones.

A multidisciplinary approach to soft-tissue sarcoma of the extremities

INTRODUCTION

Soft-tissue sarcoma (STS) denotes a group of rare and highly heterogeneous malignant tumors of mesenchymal origin. Accurate histological diagnosis is critical for selecting appropriate treatment. Complete tumor resection is the primary treatment for STS, and the efficacies of radiotherapy and chemotherapy have been tested in the adjuvant setting to improve oncological outcomes. Because most STS lesions arise in the extremities, preserving limb function and managing limb impairment after radical local treatment represent significant challenges.

AREAS COVERED

This article reviews the current front-line treatments for patients with extremity STS and discusses the multidisciplinary team-based efforts needed to improve oncological outcomes and survivorship.

EXPERT OPINION

Given the rarity, variety, and complexity of STS, a multidisciplinary approach involving experts in various disciplines is vital for improving outcomes in patients ranging from diagnosis to survivorship. A major challenge is building a sustainable system in each region permitting all patients with extremity STS to be treated at high-volume centers with multidisciplinary teams dedicated to this rare and complex disease.

Pre- or postoperative radiotherapy for soft tissue sarcomas

Sarcomas are rare tumours arising from mesenchymal tissue. A multimodal management in an expert centre combining surgery and radiotherapy is the current standard of care for localized soft-tissue sarcomas of the extremities, to enable limb-sparing strategies. The delivery of pre- radiotherapy or postoperative radiotherapy offers similar local control and survival rates but the toxicity profile is quite different: preoperative radiotherapy increases the risk of wound complications and postoperative radiotherapy affects long-term functional outcomes. While postoperative radiotherapy has long been the rule, especially in Europe, technical improvements with image-guided- and intensity-modulated radiotherapy associated with a better management of postoperative wounds has tended to change practices with more frequent preoperative radiotherapy. More recently the possibilities of a hypofractionated regimen or potentiation by nanoparticles to increase the therapeutic index plead in favour of a preoperative delivery of radiotherapy. The aim of this paper is to report pros and cons of pre- and post-operative radiotherapy for soft-tissue sarcomas.

The adequacy of resection margin for non-infiltrative soft-tissue sarcomas

OBJECTIVES

There remains no consensus on what constitutes an adequate margin of resection for non-infiltrative soft-tissue sarcomas (STSs). We aimed to investigate the role of resection margins in millimetres for non-infiltrative STSs.

METHODS

502 patients who underwent surgical resection for a localized, non-infiltrative, high-grade STSs were studied. The prognostic significance of margin width was analysed and compared with the conventional R- and R+1-classification of surgical margins.

RESULTS

The overall local recurrence (LR) rate was 13%; 9% and 27% with negative and positive margins, respectively (p < 0.001). In patients with negative margins, the LR rates were greater than 10% in patients with margins ≤5.0 mm but reduced to less than 4% with margins >5.0 mm. When classified by the R- (or R+1)-classification, the 5-year cumulative LR incidence was 8%, 23% (16%), and 31% for R0, R1, and R2, respectively, which did not stratify the LR risk with negative margins. On the other hand, an accurate risk stratification was possible by metric distance; the 5-year cumulative incidence of LR was 29%, 10%, and 1% with 0 mm, 0.1-5.0 mm, and >5.0 mm, respectively (p < 0.001). This classification also stratified the LR risk in patients with or without adjuvant radiotherapy.

CONCLUSION

While a negative margin is essential to optimize local control in patients with non-infiltrative STSs, surgical margin width greater than 5 mm minimises the risk of local failure regardless of the use of adjuvant radiotherapy.

Surgical Resection Margin Classifications for High-grade Pleomorphic Soft Tissue Sarcomas of the Extremity or Trunk After Neoadjuvant Cytotoxic Therapy

Soft tissue sarcomas of the extremities or trunk are often resected after treatment with neoadjuvant radiotherapy. Adequate surgical resection margins for sarcomas after neoadjuvant cytotoxic therapy are not well characterized. Minimum surgical resection margins required for local control of primary, high-grade, pleomorphic soft tissue sarcomas treated with neoadjuvant therapy was assessed by competing risk regression in a series of 166 cases. Optimal tumor clearance was determined to be ≥1 mm. Predictive accuracy of three commonly used resection margin classification schemes (American Joint Committee on Cancer, Musculoskeletal Tumor Society, and the margin distance method) were comparable. However, diagnostic performance of a binary system (positive vs. negative) was more specific than margin distance classification (positive or <1 vs. ≥1 mm from tumor), but less sensitive in predicting local recurrence. The American Joint Committee on Cancer R classification (R0 vs. R1/R2) seems to adequately stratify patients by risk for local recurrence after neoadjuvant therapy and subsequent surgical resection. Furthermore, close but negative resection margins (<1 mm from tumor) appear sufficient for local control of high-grade pleomorphic soft tissue sarcomas of the extremity or trunk in this clinical setting, with minimal reduction in the risk of local recurrence with increasing margin width or surgical clearance.

Vascular reconstruction using autologous vs synthetic graft for patients with extremity soft-tissue sarcoma involving the major vessels

OBJECTIVE

Arterial reconstruction after radical limb-sparing resection of extremity soft-tissue sarcoma (STS) involving great vessels is necessary. However, there is no agreement upon the optimal vascular substitute. This study prospectively evaluated the major vascular reconstructions in extremity STS surgery with vascular involvement.

PATIENTS AND METHODS

Between June 2017 and August 2019, 29 patients having extremity STS with major vascular reconstruction were enrolled. Recurrent, metastatic STSs or STSs of vascular origin were excluded. Patients were non-randomly divided into two groups according to the type of arterial substitute: group I, autologous graft (16 patients) and group II, synthetic graft (13 patients). Graft patency, postoperative morbidity, and patient and limb survival were analyzed.

RESULTS

The mean follow-up was 12 months (range, 6-26). Early postoperative complications and overall survival were nonsignificantly different between groups. The 1-year primary patency was 92.85% vs 90% in groups I vs II, respectively, P = .704. Graft occlusion was nonsignificantly greater in the synthetic group, P = .107. Limb salvage was 93.75% in group I compared with 92.3% in group II, P = .87.

CONCLUSIONS

Graft choice should be based on autologous vein suitability regarding its length and caliber. If such requirements are not available, synthetic substitutes can be used with close surveillance of patency.

Giant myxoid liposarcoma of the stomach: Report of a case

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Myxoid liposarcoma of the stomach is extremely rare.

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The tumor in the present case was too large to confirm its origin.

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Imaging findings of liposarcoma vary, and few reports have described gastric liposarcoma with a huge cyst.

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Even for large tumors, curative resection can provide the patient a good prognosis.

Introduction

Liposarcoma is one of the most common soft tissue sarcomas in adults, but liposarcoma arising primarily from the stomach is very rare.

Presentation of case

A 56-year-old man was referred to our hospital with abdominal distension and discomfort. A computed tomography scan showed a huge mass located between the stomach and transverse colon. The preliminary differential diagnoses were sarcoma with a mucinous component, gastrointestinal stromal tumor, lymphangioma, and mesenteric cyst. Upper and lower endoscopy was not performed because the patient declined. The patient underwent surgical resection, and the tumor was completely removed. Macroscopic examination revealed a 39- × 26- × 20-cm tumor weighing 13,000 g. On histological examination, the tumor was diagnosed as a myxoid liposarcoma in the gastric submucosa. The patient was still doing well 2 years postoperatively.

Discussion

Preoperative diagnosis of liposarcoma of the stomach is difficult. In the present case, the tumor was very large but was able to be resected completely.

Conclusion

Even in patients with very large myxoid liposarcoma, curative resection can provide a good prognosis.

The role of radiation therapy and margin width in localized soft-tissue sarcoma: Analysis from the US Sarcoma Collaborative

BACKGROUND AND OBJECTIVES

Soft-tissue sarcomas (STSs) are often treated with resection and radiation (RT)±chemotherapy. The role of RT in decreasing resection width to achieve local control is unclear. We evaluated RT on margin width to achieve local control and local recurrence (LR).

METHODS

From 2000 to 2016, 514 patients with localized STS were identified from the US Sarcoma Collaborative database. Patients were stratified by a margin and local control was compared amongst treatment groups.

RESULTS

LR was 9% with positive, 4.2% with ≤1 mm, and 9.3% with >1 mm margins (P = .315). In the ≤1 mm group, LR was 5.7% without RT, 0% with preoperative RT, and 0% with postoperative RT (P < .0001). In the >1 mm group, LR was 10.2%, 0%, and 3.7% in the no preoperative and postoperative RT groups, respectively (P = .005). RT did not influence LR in patients with positive margins. In stage I-III and II-III patients, local recurrence-free survival was higher following RT (P = .008 and P = .05, respectively).

CONCLUSIONS

RT may play a larger role in minimizing LR than margin status. In patients with positive margins, RT may decrease LR to similar rates as a negative margin without RT and may be considered to decrease the risk of LR with anticipated close/positive margins.

Investigating a chimeric anti-mouse PDGFRα antibody as a radiosensitizer in primary mouse sarcomas

BACKGROUND

Olaratumab (LY3012207/IMC-3G3/Lartruvo™) is a fully human monoclonal antibody specific for platelet-derived growth factor receptor alpha (PDGFRα). Phase Ib/II trial results of olaratumab plus doxorubicin in adult patients with advanced soft tissue sarcoma (STS) supported accelerated FDA approval of this regimen. Radiation therapy (RT) is frequently used for high-risk localized STS. However, olaratumab has not been tested with concurrent RT. Here, we evaluate the chimeric anti-mouse PDGFRα antibody 1E10Fc as a radiosensitizer in a primary mouse model of STS.

METHODS

Primary STS were initiated in mice. When tumors reached 70 mm³, mice were allocated into treatment groups: 1) isotype, 2) 1E10Fc, 3) isotype + RT, 4) 1E10Fc + RT. 1E10Fc or isotype was given biweekly. RT (25 Gy delivered in 5 daily 5 Gy fractions) was initiated on Day 0 with first drug treatment. Tumors were measured 3× per week. Upon reaching 900 mm³, tumors and lungs were harvested. A two-way ANOVA was performed to compare tumor growth delay. Primary tumors were stained for CD31 and PDGFRα and lungs were assessed for micrometastases. A Chi-square test was performed to compare the development of micrometastases in the lungs after treatment with 1E10Fc or isotype.

FINDINGS

RT significantly delayed time to tumor quintupling compared to no RT (p < 0·0001) [two-way ANOVA], but no difference in tumor growth was seen between mice receiving isotype or 1E10Fc treatment regardless of concurrent RT. Lower microvessel density was observed in the 1E10Fc + RT group. Fewer mice treated with 1E10Fc had micrometastases, but this difference was not statistically significant (p < 0·09).

INTERPRETATION

1E10Fc did not act as a radiosensitizer in this primary STS model.

FUNDING

This study was funded by a research agreement from Eli Lilly and Company.

Microsurgery in musculoskeletal oncology

Sarcomas are rare mesenchymal bone and soft tissue tumors of the musculoskeletal system. In the past, the primary treatment modality was amputation of the involved limb and the 5-year survival was very low for high-grade tumors. During the last three decades, limb salvage has become the rule rather than the exception and the use of neoadjuvant and adjuvant therapies (radiation and chemotherapy) has dramatically increased disease-free survival. Reconstruction of large bone and soft tissue defects, though, still remains a significant challenge in sarcoma patients. In particular, vascularized tissue transfer has proved extremely helpful in dealing with complex bone and soft tissue or functional defects that are frequently encountered as a result of the tumor or as a complication of surgery and adjuvant therapies. The principles, indications and results of microsurgical reconstruction differ from trauma patients and are directly related not only to the underlying disease process, but also to the local and systemic therapeutic modalities applied to the individual patient. Although plastic reconstruction in the oncological patients is not free of complications, usually these complications are manageable and do not jeopardize oncological outcome. The overall treatment strategy should be tailored to the patient's and sarcoma profile.

The impact of biopsy sampling errors and the quality of surgical margins on local recurrence and survival in chondrosarcoma

Purpose

To examine the frequency of computed tomography (CT)-guided biopsy sampling errors in chondrosarcomas, as well as the impact of these errors and the achieved surgical margins on local recurrence-free survival (LRFS) and disease-specific survival (DSS).

Material and methods

A total of 68 consecutive patients treated for chondrosarcoma from 2000–2015 were retrospectively reviewed with a minimum follow-up duration of 2 years.

Results

The primary location was at the extremities in 46 patients (67.6%) and at the axial skeleton in 22 patients (32.4%). Seven patients underwent planned intralesional curettage. Surgical margins were assessed in the remaining 53 patients and included 21 wide (39.6%), 25 marginal (47.1%), and seven intralesional (13.2%) resections. Biopsy sampling errors occurred in ten patients (14.7%). LRFS was 82.2±7.8% at 5 years and 76.9±7.8% at 10 years. An intact anatomical barrier was associated with the most preferable LRFS of 89±10.5% after 10 years. DSS was 79.2±8.5% at 5 years and 75.5±6.4% at 10 years. The metric distance of the surgical margin and the presence of a biopsy sampling error did not affect either LRFS or DSS.

Conclusion

Even though histological grading in chondrosarcoma is difficult, sampling errors in preoperative biopsies are relatively rare and do not adversely affect outcomes. The presence of an anatomical barrier has a greater impact on LRFS than the metric distance of the surgical margins.

Postoperative Day 1 Glucose May Be Associated With Wound Complications in Sarcomas Treated With Preoperative Radiation

BACKGROUND

Uncontrolled blood glucose impacts key phases of the wound healing process. Various factors have been associated with postoperative wound complications in soft tissue sarcomas; however, the association of postoperative early morning blood glucose with wound complications, if any, remains to be determined. Because blood glucose levels may be modified, understanding whether glucose levels are associated with wound complications has potential therapeutic importance.

QUESTIONS/PURPOSES

The purposes of this study were (1) to evaluate if postoperative early morning blood glucose is associated with the development of wound complications in soft tissue sarcomas; (2) to determine a blood glucose cutoff that may be associated with an increased risk of wound complications; and (3) to evaluate if patients with diabetes have higher postoperative blood glucose and an associated increased risk of wound complications.

METHODS

From 2000 to 2015, 298 patients with Stage I to III soft tissue sarcomas of the extremity or chest wall were treated with preoperative radiation ± chemotherapy followed by limb-sparing resection. Of those, 191 (64%) patients had demographic, treatment, and postoperative variables and wound outcomes available; these patients' results were retrospectively evaluated. None of the 191 patients were lost to followup. Early morning blood glucose levels on postoperative day (POD) 1 were available in all patients. Wound complications were defined as those resulting in an operative procedure or prolonged wound care for 6 months postresection. Variables that may be associated with wound complications were evaluated using logistic regression for multivariate analysis. Receiver operative curve (ROC) analysis was used to assess the early morning blood glucose level that best was associated postoperative wound complications.

RESULTS

After controlling for potentially relevant confounding variables such as patient comorbidities, tumor size, and location, lower extremity soft tissue sarcomas (p = 0.002, odds ratio [OR], 6.4; 95% confidence interval [CI], 1.97-20.84) and elevated POD 1 early morning blood sugars (p < 0.001; OR, 1.1; 95% CI, 1.04-1.11) were associated with increased wound complications postoperatively. ROC analysis revealed that early morning POD 1 blood glucose of > 127 mg/dL was associated with postoperative wound complications with a sensitivity of 89% (area under the curve 0.898, p < 0.001). Median POD 1 early morning blood glucose in patients without diabetes was 118 mg/dL and 153 mg/dL in patients with diabetes (p = 0.023). However, with the numbers available, there was no increase in wound complications in patients with diabetes compared with those without it.

CONCLUSIONS

Our study provides preliminary information suggesting that POD 1 early morning blood glucose in patients with soft tissue sarcomas may be associated with a slightly increased risk of postoperative wound complications. An early morning blood glucose of > 127 mg/dL may be a threshold associated with this outcome. Although patients with diabetes had higher POD 1 early morning blood glucose levels, diabetes itself was not associated with the development of wound complications. We cannot conclude that better glycemic control will reduce wound complications in patients who receive preoperative radiation, but our data suggest this should be further studied in a larger, prospective study.

LEVEL OF EVIDENCE

Level III, therapeutic study.

Importance of wide re-resection in adult spermatic cord sarcomas: Report on oncologic outcomes at a single institution

BACKGROUND AND OBJECTIVES

We evaluated the effect of re-resection with wide margins (undertaken because initial resection performed elsewhere was incomplete) on survival in patients with spermatic cord sarcoma (SCS).

METHODS

After excluding those with metastatic disease and those not undergoing surgical intervention, the records of 72 consecutive patients treated for SCS between 1981 and 2011 at Memorial Sloan Kettering Cancer Center were reviewed. Recurrence-free survival (RFS) and cancer-specific survival were calculated using the Kaplan-Meier method for comparing between the 48 patients who underwent wide re-resection (WRR) within 5 months of diagnosis and the 24 who did not. The relationship of age, tumor size, tumor histology, adjuvant radiation, and wide re-resection with recurrence and death was assessed by univariate Cox regression.

RESULTS

WRR significantly improved RFS (hazard ratio [HR] 0.16, 95%CI 0.07-0.37; P < 0.0001), despite the fact that patients receiving WRR had higher-grade disease. Tumor-positive margins upon WRR were strongly associated with both disease recurrence (HR 5.56; 95%CI 1.14-27.11, P = 0.034) and death from cancer (HR 6.16, 95%CI 1.25-30.29; P = 0.025).

CONCLUSIONS

A WRR with negative margins is effective in the management of patients with SCS and leads to improved RFS.

Local Control of Soft Tissue and Bone Sarcomas

Sarcomas of soft tissue and bone are mesenchymal malignancies that can arise in any anatomic location, most commonly the extremity, retroperitoneum, and trunk. Even for lower grade histologic subtypes, local recurrence can cause significant morbidity and even disease-related death. Although surgery remains the cornerstone of local control, perioperative radiation and systemic therapy are often important adjuvants. This review will summarize the current therapeutic approaches for local control of soft tissue and bone sarcomas.

Local Recurrence of Extremity Soft Tissue Sarcoma

The management of recurrent soft tissue sarcoma is a challenging problem for clinicians and has a significant physical, mental, emotional, and oncologic impact for the patient. Despite excellent limb-preservation therapies, approximately one-quarter of patients may eventually develop recurrence of disease. How to most appropriately manage these patients is a matter of debate. Several treatment options exist, including surgical resection, irradiation, systemic chemotherapy, amputation, and regional therapies. This article highlights the management of recurrent extremity soft tissue sarcoma.

Effect of Previous Irradiation on Vascular Thrombosis of Microsurgical Anastomosis: A Preclinical Study in Rats

BACKGROUND

The objective of the present investigation was to compare the effect of neoadjuvant irradiation on the microvascular anastomosis in cervical bundle using an experimental model in rats.

METHODS

One hundred forty male Sprague-Dawley rats were allocated into 4 groups: group I, control, arterial microanastomosis; group II, control, venous microanastomosis; group III, arterial microanastomosis with previous irradiation (20 Gy); and group IV, venous microanastomosis with previous irradiation (20 Gy). Clinical parameters, technical values of anastomosis, patency, and histopathological parameters were evaluated.

RESULTS

Irradiated groups (III and IV) and vein anastomosis groups (II and IV) showed significantly increased technical difficulties. Group IV showed significantly reduced patency rates (7/35) when compared with the control group (0/35). Radiotherapy significantly decreased the patency rates of the vein (7/35) when compared with the artery (1/35). Groups III and IV showed significantly reduced number of endothelial cells and also showed the presence of intimal thickening and adventitial fibrosis as compared with the control group.

CONCLUSION

Neoadjuvant radiotherapy reduces the viability of the venous anastomosis in a preclinical rat model with a significant increase in the incidence of vein thrombosis.

Soft tissue sarcoma of the extremities: pending questions on surgery and radiotherapy

Soft tissue sarcomas are uncommon tumours of mesenchymal origin, most commonly arising in the extremities. Treatment includes surgical resection in combination with radiotherapy. Resection margins are of paramount importance in surgical treatment of soft tissue sarcomas but unambiguous guidelines for ideal margins of resection are still missing as is an uniform guideline on the use of radiotherapy.

The present paper reviews the literature on soft tissue sarcomas of the extremities regarding the required resection margins, the impact of new radiotherapy techniques and the timing of radiotherapy, more particularly if it should be administered before or after surgical resection.

This review was started by searching guidelines in different databases (National Guideline Clearinghouse, EBMPracticeNet, TRIP database, NCCN guidelines,…). After refinement of the query, more specific articles were found using MEDLINE, PubMed, Web of Science and Google Scholar. Used keywords include “soft tissue sarcoma”; “extremities OR limbs”; “radiotherapy”, “surgery”, “margins”, “local recurrence” and “overall survival”. Finally, the articles were selected based on the accessibility of the full text, use of the English language and relevance based on title and abstract.

Literature demonstrates positive resection margins to be an important adverse prognostic factor for local recurrence of soft tissue sarcomas of the extremities. Still, no consensus is reached on the definition of what a good margin might be. The evolution of new radiation techniques, especially Intensity Modulated Radiotherapy, resulted in a s healthy surrounding tissues. However, the timing of radiotherapy treatment remains controversial as both preoperative and postoperative radiotherapy are characterised by several advantages and disadvantages.

[Radiotherapy for soft tissue sarcomas: Technical evolution and impact on clinical benefit]

The standard treatment for extremity soft tissue sarcomas is based on the association of surgery and radiotherapy. This strategy allows local control improvement with the risk of increased toxicity. There is therefore a growing interest to identify those patients who will benefit from radiotherapy and those who will have the same local control with surgery alone. Furthermore, the development of toxicity has been correlated with the extension of the irradiated volume and the volume receiving high doses. Technological development as intensity modulated radiotherapy and image-guided radiotherapy allows limited irradiated volume improving the protection of the organs at risk leading to clinical benefit improvement. Moreover, efforts are being done to improve local control for the patients at high risk of local relapse. In this paper, we discuss all these mentioned aspects.

The Width of the Surgical Margin Does Not Influence Outcomes in Extremity and Truncal Soft Tissue Sarcoma Treated With Radiotherapy

BACKGROUND AND OBJECTIVES

It is unclear whether the quantitative width of the surgical margin influences outcomes in patients with extremity and truncal soft tissue sarcoma (STS) treated with radiotherapy (RT).

METHODS

We performed a retrospective review of 382 patients with localized extremity or truncal STS who underwent limb-sparing surgery and RT from 1983 to 2010, and we analyzed the significance of resection margin status and quantitative margin width on outcomes.

RESULTS

Surgical margins were positive in 68 (18%) patients and negative in 314 (82%) patients. For those patients with a reported quantitative margin width (n = 235), the width of the negative margin was ≤1 mm (n = 128), >1 mm and ≤5 mm (n = 79), and >5 mm (n = 28). At a median follow-up of 82 months, the local recurrence rates were 5.4% and 11.8% for margin-negative and margin-positive patients, respectively. There were no differences in the rates of local or distant recurrence nor of any survival outcome based on the quantitative width of the surgical margin, provided that it was negative.

CONCLUSIONS

In patients undergoing RT and limb-sparing surgery for STS, achieving a negative margin is essential for optimizing both local control and survival. However, the absolute quantitative width of the negative margin does not significantly influence outcome, and so attempts at wide margins of resection appear to be unnecessary. Importantly, the conclusions drawn from this study must not be applied to those patients undergoing surgery alone as the local treatment of their STS, in which case wider margins of resection may be necessary.

IMPLICATIONS FOR PRACTICE

In patients undergoing radiation therapy and limb-sparing surgery for soft tissue sarcoma, the quantitative width of the negative margin does not influence outcome, and so attempts at wide margins of resection appear to be unnecessary, especially when such attempts compromise the functional outcome. Importantly, the conclusions drawn from this study must not be applied to those patients undergoing surgery alone as the local treatment of their soft tissue sarcoma, in which case wider margins of resection may be necessary.

New and safe experimental model of radiation-induced neurovascular histological changes for microsurgical research

The aim is to create a new and safe experimental model of radiation-induced neurovascular histological changes with reduced morbidity and mortality for use with experimental microsurgical techniques. Seventy-two Sprague-Dawley rats (250-300 g) were divided as follows: Group I: control group, 24 rats clinically evaluated during six weeks; Group II: evaluation of acute side-effects (two-week follow-up period), 24 irradiated (20 Gy) rats; and Group III: evaluation of subacute side-effects (six-week follow-up period), 24 irradiated (20 Gy) rats. Variables included clinical assessments, weight, vascular permeability (arterial and venous), mortality and histological studies. No significant differences were observed between groups with respect to the variables studied. Significant differences were observed between groups I vs II-III regarding survival rates and histological changes to arteries, veins and nerves. Rat body weights showed progressive increases in all groups, and the mortality rate of the present model is 10.4% compared with 30-40% in the previous models. In conclusion, the designed model induces selective changes by radiotherapy in the neurovascular bundle without histological changes affecting the surrounding tissues. This model allows therapeutic experimental studies to be conducted, including the viability of microvascular and microneural sutures post radiotherapy in the cervical neurovascular bundle.

The role of radiotherapy in the management of localized soft tissue sarcomas

The combination of radiotherapy (RT) and function-preserving surgery is the most usual contemporary approach in the management of soft tissue sarcomas (STS). Pre- and postoperative RT result in similar local control rates, as shown by a landmark trial in extremity STS. In this review, the role of RT in the management of extremity STS will be discussed, but STS in other sites, including retroperitoneal STS, will also be addressed. The focus will consider various aspects of RT including strategies to reduce the volume of tissue being irradiated, dose, scheduling, and the possible of omission of RT in selected cases. Finally, technology advances through the use of intensity-modulated radiotherapy (IMRT), image-guided IMRT, intraoperative radiotherapy (IORT) and particle therapy will also be discussed.

The role of margins in extremity soft tissue sarcoma

For extremity soft tissue sarcomas, limb salvage is now standard of care. The extent of surgical margins is balanced with functionality of the resected limb. Although negative margins are the goal, the necessary width is unclear. Additional considerations for margin adequacy include presence of anatomic barriers such as fascia and periosteum, proximity of critical structures, receipt of adjuvant and neoadjuvant therapies, and histologic subtype. Multidisciplinary team discussion is critical for treatment planning.

Biopsies in the Community Lead to Postoperative Complications in Soft Tissue Sarcomas

Percutaneous biopsies allow for precise diagnosis in soft tissue sarcomas and have a low rate of complications. However, it is unknown whether biopsies performed in a community setting lead to higher rates of wound complications at the time of resection. The goal of this study was to determine whether percutaneous biopsies performed at a sarcoma center have lower rates of wound complications compared with those performed in the community setting. A total of 125 patients with soft tissue sarcomas were treated with neoadjuvant radiation followed by limb-sparing resection. Of these, 92 underwent percutaneous biopsy. Patient, demographic, and treatment variables and postoperative wound complications were reviewed. Predictors of wound complications were evaluated with Fisher's exact test for univariate analysis and with logistic regression for multivariate analysis. The wound complication rate was 27% for open or percutaneous biopsies. When only percutaneous biopsies were assessed, the wound complication rate was 25%. The wound complication rate for percutaneous biopsies was 18% when the biopsy was performed at the authors' sarcoma center and 46% when the biopsy was performed in the community setting (P=.01). The Common Terminology Criteria for Adverse Events grade 4 wound complication rate was 73% in patients who underwent percutaneous biopsy at a community hospital vs 14% in those who underwent percutaneous biopsy at the authors' sarcoma center (P=.005). Multivariate analysis showed that lower-extremity soft tissue sarcomas (P=.03) and biopsies performed in the community setting (P=.01) had an increased rate of postoperative wound complications. Percutaneous biopsies performed at community hospitals had an increased incidence of grade 4 postoperative wound toxicity compared with biopsies done at tertiary centers. These wound results confirmed previous recommendations that biopsy of soft tissue sarcomas should be performed at an experienced sarcoma center.

A quantitative microscopic approach to predict local recurrence based on in vivo intraoperative imaging of sarcoma tumor margins

The goal of resection of soft tissue sarcomas located in the extremity is to preserve limb function while completely excising the tumor with a margin of normal tissue. With surgery alone, one-third of patients with soft tissue sarcoma of the extremity will have local recurrence due to microscopic residual disease in the tumor bed. Currently, a limited number of intraoperative pathology-based techniques are used to assess margin status; however, few have been widely adopted due to sampling error and time constraints. To aid in intraoperative diagnosis, we developed a quantitative optical microscopy toolbox, which includes acriflavine staining, fluorescence microscopy, and analytic techniques called sparse component analysis and circle transform to yield quantitative diagnosis of tumor margins. A series of variables were quantified from images of resected primary sarcomas and used to optimize a multivariate model. The sensitivity and specificity for differentiating positive from negative ex vivo resected tumor margins was 82 and 75%. The utility of this approach was tested by imaging the in vivo tumor cavities from 34 mice after resection of a sarcoma with local recurrence as a bench mark. When applied prospectively to images from the tumor cavity, the sensitivity and specificity for differentiating local recurrence was 78 and 82%. For comparison, if pathology was used to predict local recurrence in this data set, it would achieve a sensitivity of 29% and a specificity of 71%. These results indicate a robust approach for detecting microscopic residual disease, which is an effective predictor of local recurrence.

The effect of smoking and major vein resection on post-therapy lymphedema in soft tissue sarcomas treated with neoadjuvant radiation and limb-salvage surgery

BACKGROUND

Neoadjuvant therapy with radiation +/- chemotherapy is an accepted management for soft tissue sarcomas (STS). The incidence of post-therapy lymphedema is around 30%. The purpose of this study was to identify variables that predict for post-therapy lymphedema.

METHODS

From 2000 to 2010, 132 patients with STS were treated with neoadjuvant radiation +/- chemotherapy followed by resection. Patient variables and treatment outcomes were reviewed. Presence of lymphedema was determined by the treating physician. The Fisher exact test was used for univariate analysis and logistic regression was used for multivariate analysis.

RESULTS

Median follow-up was 3.1 years. Of the lower extremity STS, major veins were sacrificed in 34% of patients. Lymphedema occurred in 22.4% of patients. Smoking negatively predicted for lymphedema on univariate analysis (P=0.007), and sacrifice of a major vein was associated with an increased risk of lymphedema (P=0.02). On multivariate analysis, smoking (P=0.02, odds ratio 0.31) negatively predicted for and sacrifice of a major vein (P=0.03, odds ratio 2.7) positively predicted for lymphedema.

CONCLUSIONS

There may be an association between smoking and decrease post-therapy lymphedema. Also, patients who undergo resection of a major vein seem to be more prone to post-therapy lymphedema.

[Resection margins in bone tumors: what is adequate?]

BACKGROUND

In multimodal therapy concepts for bone sarcomas, tumor resection is a deciding factor. Modern imaging techniques have made preoperative resection planning much easier and precisely allow tumor boundaries to be defined.

OBJECTIVES

There is recent data clearly showing that compartmental resections have no significant advantages compared to wide resections in terms of local recurrence or overall survival. But it remains unclear, how "wide" a "wide resection" should be done.

MATERIALS AND METHODS

A literature review of the last 15 years, discussion of review articles and multidisciplinary expert opinions as published in major multinational studies.

RESULTS

Intralesional resection (R1) is feasible in highly differentiated (G1) chondrosarcoma (atypical cartilaginous tumor) of the extremity. In both osteosarcoma and Ewing's sarcoma, R0 resection is mandatory. If these fails, there is evidence that in selected cases of osteosarcoma, adjuvant radiotherapy is justified if a second resection is not possible. Expecting contaminated (R1) margins in patients with Ewing's sarcoma (e.g., in critical locations such as the pelvis), radiotherapy only is better than hoping for the "cure" of insufficient resections margins with a combination of both methods. With regard to the necessary safety distances for a R0 resection, recommendations from the literature are heterogeneous. In addition to the distance measurement, the quality of the anatomic resection margins (e.g., fascia) is of great importance. A distinct recommendation of at least x millimeters or centimeters cannot be given based on the currently available data.

CONCLUSION

The aim of the resection of a bone sarcoma should be a wide margin with the exception of chondrosarcoma (G1). Ultraradical resections which sacrifice vital structures in order to extend an already wide (R0) resection margin showed no significant benefits. In patients with osteosarcoma, adjuvant radiotherapy should be considered if resection or re-resection is not in sound tissue (R1). Patients with Ewing's sarcoma should not undergo resection if a contaminated margin is expected. In patients with chondrosarcoma, the available data as for example from pelvic tumors are contradictory and do not allow a clear recommendation.

Quality of life, functional outcomes, and wound complications in patients with soft tissue sarcomas treated with preoperative chemoradiation: a prospective study

BACKGROUND

Preoperative irradiation reduces local recurrence of soft tissue sarcomas (STSs), but major wound complication rates approach 25-35 %. Using a novel neoadjuvant chemoradiation protocol, we prospectively documented functional outcomes and quality of life (QOL) and hypothesized a lower major wound complication rate.

METHODS

Patients with STS deep to muscular fascia were treated with 3 days of doxorubicin (30 mg/day) and 10 days of irradiation (300 cGy/day) followed by limb-sparing surgery. Wound complications were assessed, and functional assessment and QOL were followed prospectively using the Toronto Extremity Salvage Score (TESS), Musculoskeletal Tumor Society (MSTS), and Short Form (SF)-36 questionnaires preoperatively and 6 and 12 months postoperatively.

RESULTS

Altogether, 52 consecutive patients were accrued during 2006-2011. Overall, 80.8 % of STSs were >5 cm, and 67.3 % involved the lower extremity. Seven (13.5 %) major wound complications occurred, all requiring reoperation. Preoperative scores for TESS, MSTS, and SF-36 physical (PCS) and mental (MCS) health components were 83.3, 86.7, 40.6, and 49.4, respectively. There were no differences seen 6 months postoperatively. By 12 months, however, patients showed improved functional scores (TESS 93.0, p = 0.02; MSTS 93.3, p < 0.01) and QOL scores (PCS 45.1, p = 0.02; MCS = 52.9, p = 0.05). No differences in scores were seen between patients with or without wound complications.

CONCLUSIONS

Patients treated with our neoadjuvant chemoradiation protocol had stable QOL and functional scores 6 months postoperatively and showed improvement by 12 months. Importantly, the major wound complication rate was low.

The role of modern radiation therapy in the management of extremity sarcomas

For nearly half a decade, surgery and radiation therapy have been used in combination to achieve the goal of limb preservation in extremity soft tissue sarcoma, with success rates in excess of 90%. Common decision points in therapeutic radiation delivery for sarcoma are discussed, including preoperative versus postoperative irradiation, the postoperative boost, and when irradiation might be unnecessary. We describe specialized techniques, such as brachytherapy and intraoperative irradiation. The data driving current practice is summarized.