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Erschienen in: memo - Magazine of European Medical Oncology 2/2020

Open Access 09.03.2020 | short review

The role of surgery in soft tissue sarcoma: Can we improve outcome and function towards sporting activities?

verfasst von: MD Reinhard Windhager, Gerhard M. Hobusch

Erschienen in: memo - Magazine of European Medical Oncology | Ausgabe 2/2020

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Summary

Limb-sparing surgery with pre- or postoperative irradiation has evolved as the standard of care for local tumor control of soft tissue sarcoma while ablative procedures are applied in selected cases only. Adequate excision of sarcoma is prerequisite to guarantee local tumor control. While excision with wide margins has been educated in the past, tumor excision with closer margins has shown to provide similar local tumor control. Beside this oncological aspect, type of surgery and reconstruction impact the functional outcome after sarcoma excision in the extremities, which adds to quality of life for the patients. Satisfactory results have been shown by different scoring systems; however, more recent studies focus on high level activities like sports to define the efficacy of different procedures. This review focuses on recent developments within these two topics.
Hinweise

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Background

Soft tissue sarcomas (STS) are rare tumors of mesenchymal origin and account for roughly 1% of all adult malignancies [1]. Soft tissues sarcoma represent a very heterogeneous group of malignancies originating from the connective tissues with more than 50 histological subtypes [2]. The yearly incidence in Europe ranges between two and four new cases of STS per 100,000 people [3, 4]. As the majority of STSs arise in the extremities and only 30% in the trunk, particularly in the retroperitoneum and 10% in the head and neck area, this review will focus only on soft tissue sarcomas in the extremities discussing the principle of local excision and the impact on local and systemic tumor control as well as new aspects in the functional outcome evaluation [5].
Diagnosis of STSs is often delayed due to the indolence of these palpable tumors, which can grow to a large extent until they cause discomfort and lead to consultation. Diagnosis is furthermore delayed by the fact that benign soft tissue tumors are hundredfold more frequent than STSs making distinction and clinical judgment difficult. Before treatment, exact diagnosis has to be established by core needle biopsy, preferably performed under ultrasound-guided imaging. The algorithm of diagnosis and treatment should always start with MRI as the method of choice followed by staging with chest CT or PET-CT after the diagnosis of sarcoma has been established (Fig. 1). There are several international, national and local institutions like the European Society for Medical Oncology–European Reference Network for rare adult solid cancers (ESMO-EURACAN) or the National Cancer Institute (NIH, Adult soft tissue treatment) providing practical guidelines in the treatment of STS [68]. Surgery has remained the mainstay in the treatment of STSs, despite significant progress in radiation and systemic targeted therapies. With the aim of local tumor control and satisfactory functional outcome, surgical treatment including microsurgical reconstruction using functional muscle and tendon transfers has changed significantly over the last few decades [9]. While amputation was the standard of care in the treatment of soft tissue sarcomas in the very beginning, this treatment has been substituted by limb-sparing surgery after evidence has been gained about the safety and effectiveness of this combined therapy by prospective randomized trials [1012]. Limb-sparing surgery with simple local excision of soft tissue sarcoma was associated with a higher local recurrence rate compared to amputation if not combined with radiotherapy [1316]. Radiation therapy can be applied either preoperatively or postoperatively [16]; however, discussion about advantages and disadvantages of these treatment modalities would exceed the scope of this review. Nevertheless, over the last three decades limb-sparing surgery with radiation therapy has become the standard of care in the treatment of localized soft tissue sarcomas, whereas amputation is carried out in less than 10%.

Surgical margins

The concept of sarcoma resection has been widely influenced by the publications of Enneking et al. in the 1980s [17]. Their definition of surgical margins was based on the theory that the pseudocapsule as the outer layer of these tumors was surrounded by a reactive zone possibly containing tumor cells. Thus, they defined an adequate STS resection as an en bloc removal of the tumor with a healthy cuff of tissues covering this reactive zone. This type of adequate tumor resection was called wide resection, while marginal or intralesional margins touching the reactive zone or the tumor respectively were regarded inadequate. So-called radical resections removing the whole tumor-bearing compartment have been recommended for high-grade sarcomas; however, due to extra compartmental extension of these high-grade lesions this type of treatment is rarely applicable. Although widely used, the definition of wide margins has been questioned over the last two decades, leading to changes in the paradigm of soft tissue resection [18]. While definitions of margins in retrospective analyses varied significantly [19], those studies evaluating the width of resection margins are within the focus of this paper.
One of the first studies analyzing the width of resection margin in 111 patients after R0 resections showed better local tumor control in negative margins wider than 10 mm compared to margins less than 10 mm, however, without any influence on overall survival [20]. Soon after this publication two studies analyzing all together 544 patients found out that negative margins more than 1 mm were adequate to improve a local control but again without any change in survival [21, 22]. In a more recent study, 235 patients were analyzed with respect to margins less than 1 mm, between 1 and 5 mm and more than 5 mm. There was no difference between these three subgroups with respect to local control and overall survival [23]. This finding was supported by another study analyzing 590 patients with R0 resected extremity soft tissue sarcomas showing that even a margin width of less than 1 mm had a similar favorable outcome when compared with wider margins [24, 25]. However, the 5‑year local recurrence-free survival in this analysis was lower compared to the other studies, while the 5‑year disease-free survival was similar.
Although there is more evidence that margins of about 1 mm is sufficient for local tumor control, it is unclear and discussed extensively whether the quality of resection has an impact on survival representing an independent factor such as grade, size and depth. While in one of the largest series of soft tissue sarcomas an association between surgical margin and survival could be established [5, 11, 26], other studies pointed out contradictory findings without any association between margin’s status and survival [27]. Because of this contradiction several authors point out that the positive margin’s status maybe regarded rather as a result of the aggressiveness of the tumor biology with a higher potential to metastasize than a failure of surgical technique.

Functional evaluation

Wide tumor resections can lead to decreased function and disability due to major tissue defects and long-term survivors of musculoskeletal tumors therefore become less physically activity, which results in a reduced state of health [28, 29]. Assi et al. pointed out the importance of the prescription of post- and even preoperative physical activity to improve QOL in patients after lower extremity sarcoma [29]. Numerous literature examples demonstrate the usage of clinician reported functional outcomes (CROMS), such as the Musculo-Skeletal Tumor Society Score (MSTS) after treatment of STS [30]. Only a few studies report on patient-reported outcomes after treatment of sarcomas, e.g., the Toronto Extremity Salvage Score (TESS) [31].
The long-term MSTS outcomes range between 77 and 100, while the long-term TESS outcomes range between 86 and 100 [30, 32]. More recently sports activity, as a complex functional leisure activity, has been used to serve as patient-reported outcome measure after STS treatment. According to this case series patients after STS treatment reported a mean possible workout time of about 4 h/week in the long-term, as well as a UCLA sports activity level of about 8/10. The UCLA Measurement shows good correlations with already existing MSTS as well as TESS scores. Sports may be important in many patients’ lives for the majority of sarcoma patients and it turns out that apart from biking, jogging, swimming as well as gymnastic exercise, some patients are still able to participate in high-impact sports such as running, soccer, tennis, and skiing as shown in later follow-up assessments.
However, deep muscle-resections decreased high active sports to 43% activity compared to 82% of patients after superficial tumors. As a consequence more patients start to participate in low-impact sports to compensate for high-impact activities prior to surgery [32].
Several authors proclaim differences in activity depending on the location of sarcomas and resected muscle groups respectively [30, 32]. There is agreement on less favorable results after resection of the lateral vastus muscle and gastrocnemius muscle with UCLA activity levels of 7/10 being reached. However, diverse functional outcomes after biceps femoris resection and other muscles were reported. The tumor site obviously plays a role in postoperative mobility and reasons for outcome discrepancies between afflicted muscle groups may be found in underpowered study designs as well as differences regarding individual adaptation skills to certain resections.
A major limitation in most of the cross-sectional studies lies in fact that functional data up to now is not used as an individual continuous measure to express individual functional development. Furthermore functional data often show large variance indicating the presence of different functional outcomes in many patients. A recent literature review concludes that although PROMs are used in clinical studies of STS, they are not specific and may not capture the unique needs of this population [33]. However, the assessment of outcome data including qualitative research is critically important to better understand the needs of soft tissue sarcoma patients. Furthermore, the implementation of preliminary pre- and postoperative physical activity recommendations are equally important [29]. It is necessary to draw attention to this topic to improve individualization of patient care, to precisely shape patients’ expectations and to improve the individual outcome.
Take-home message
Resection of soft tissue sarcomas of the extremities with clear margins in combination with pre- or postoperative radiation therapy provides excellent local tumor control and satisfactory functional outcome. As a prerequisite the algorithm for diagnosis and staging and correctly performed biopsy has to be carefully followed.

Conflict of interest

R. Windhager receives honoraria from Stryker, CeramTec, Johnson & Johnson (Institutional/Educational Support), Stryker GmbH (Consulting Agreement), Johnson & Johnson (Royalties). G.M. Hobusch declares that he has no competing interests.
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Metadaten
Titel
The role of surgery in soft tissue sarcoma: Can we improve outcome and function towards sporting activities?
verfasst von
MD Reinhard Windhager
Gerhard M. Hobusch
Publikationsdatum
09.03.2020
Verlag
Springer Vienna
Erschienen in
memo - Magazine of European Medical Oncology / Ausgabe 2/2020
Print ISSN: 1865-5041
Elektronische ISSN: 1865-5076
DOI
https://doi.org/10.1007/s12254-020-00583-3