Date of document January 2023
This is the current valid version of the document


Osteosarcoma is the most common malignant bone tumor and is characterized by early micrometastasis. The introduction of systemic chemotherapy in addition to tumor resection has significantly improved the prognosis of patients [12]. Therefore, multimodal therapy using neoadjuvant chemotherapy followed by wide tumor resection and adjuvant chemotherapy is now considered the standard of care. Thus, 5-year survival rates of 70% can be achieved [3]. Possible primary metastases must additionally be surgically removed if the goal of therapy is curative. High-dose radiotherapy is indicated only in case of incomplete tumor resection. In case of recurrence, complete metastasectomy has the highest priority. Second-line chemotherapy for patients in second surgical remission is frequently performed but is not yet supported by prospective studies.


2.1Definition and basic information

Osteosarcoma is a mesenchymal tumor disease characterized by the formation of immature bone substance (osteoid). Hematogenous metastasis must be assumed even at initial diagnosis. Predilection sites are the metaphyses of the long tubular bones (especially the knee region with distal femur and proximal tibia, but also the distal humerus), while involvement of the spine and pelvic skeleton is less common. In most patients, only a singular primary tumor lesion occurs [46].


Osteosarcoma is rare, with an annual incidence of about 0,2-0,3 per 100,000 persons (crude incidence rate). In Germany, 1934 cases were recorded in the regional cancer registries or the German Childhood Cancer Registry nationwide between 2010 and 2019, of which 885 occurred in women and girls. The disease accounts for just under a quarter of malignant tumors of bone. A clear age peak is in the 2nd decade, where osteosarcoma represents more than half of malignant bone tumors. In European registries, another incidence peak is found in the 7th and 8th decades of life [7]. The overall slightly higher incidence in males results mainly from the significantly higher incidence rates between the ages of 15 and 24 years (Figure 1). Accordingly, the median age at onset in men (30 years) is significantly lower than in women (40 years).

Slightly more than half of the cases involve the long tubular bones of the lower extremity, with this proportion exceeding 70% in childhood and adolescence and declining progressively with age. Relative 10-year survival rates are around 68% in both children and adolescents as well as in young adults (up to 39 years) and decrease significantly in middle and older adulthood (40-65 years, 40%, 65 years and older, 15%) (Figure 2).

Figure 1: Annual incidence rates of osteosarcoma in Germany by age and gender (per 100,000 persons, 2010-2019) 
Annual incidence rates of osteosarcoma in Germany by age and gender (per 100,000 persons, 2010-2019)
Figure 2: Relative survival rates after diagnosis of osteosarcoma in Germany, by age group, period 2015-2019* 
Relative survival rates after diagnosis of osteosarcoma in Germany, by age group, period 2015-2019*
* Results for the age group 0-17 years provided by the German Childhood Cancer Registry (2010-2019)


Osteosarcoma is a usually highly aggressive bone-derived sarcoma originating from pluripotent mesenchymal progenitor cells. Conventional osteosarcomas are mostly characterized by high genomic instability with complex karyotype and numerous numerical and structural aberrations [8]. Alterations in TP53 and RB1 are the most common recurrent aberrations. Approximately 80% of osteosarcomas have additional alterations that are also found in cancers with homologous recombination repair deficiency [9].

2.4Risk factors

There are several known risk factors for the emergence of osteosarcoma:

  • Ionizing radiation (typical time interval 12-16 years).

  • Chemotherapy (especially alkylating substances)

  • Paget's disease (in patients > 40 years)

  • Genetic predisposition syndrome (e.g., RB1 mutation in retinoblastoma, TP53 mutation in Li-Fraumeni syndrome, RECQL4 mutation in Rothmund-Thomson syndrome, RECQL4 mutation in RAPADILINO syndrome, and BLM and WRN mutations in Bloom and Werner syndromes).

3Prevention and early detection

There is no evidence of effective measures for prevention and early detection in the general population. Individuals with known hereditary predisposition are excluded.

4Clinical characteristics

The leading symptom is pain in the affected region, which often lasts for weeks and is load-independent. In addition, there may be swelling or functional impairment. In about 10% of cases, a pathologic fracture is already present at first diagnosis [10]. General symptoms such as fever, weight loss, or a decreased general condition are usually lacking.

In osteosarcomas of the jaw, loosening of teeth and swelling may be early symptoms.

In approximately 10-20% of patients, macrometastases can already be detected at initial staging. The target organ is most frequently the lung, followed by the bones. In the remaining 80-90% of patients, micrometastasis must be assumed at initial diagnosis. Detection of metastasis at first diagnosis results in a worse prognosis [11].


5.1Diagnostic procedures

Careful history taking and complete physical examination are the basis of rational diagnostics. The following diagnostic measures are recommended (see Tables 1-3).

Table 1: Diagnostic procedures for new-onset symptoms 
  • X-rays of the affected bone and adjacent joints in 2 planes

  • Magnetic resonance imaging (MRI) of local findings according to standardized protocol*.

  • Biopsy**

*Initial diagnosis, MRI must include T1-weighted imaging of the entire tumor-bearing bone in the long axis to detect or exclude skip lesions. Subsequently, the scan should switch to a high-resolution coil and image the tumor with the adjacent joint (small imaging field) to accurately visualize local tumor spread. The slice orientation in the long axis depends on the anatomy of the adjacent joint (coronal at wrist, shoulder and hip joint, sagittal at knee and ankle). The following pulse sequences must be performed as a minimum:
Long axis: STIR, T1-weighted before and after intravenous contrast administration (incl. image subtraction)
Short axis: T2-weighted, T1-weighted with fat suppression after intravenous contrast administration
**Biopsy can be performed as punch biopsy or open biopsy. It is important that sufficient material is obtained and that a surgeon experienced in bone sarcoma therapy is involved in the diagnosis from the beginning.

If the suspected diagnosis of osteosarcoma is confirmed on biopsy, staging is indicated (see Table 2). It is based on the most frequent localizations of metastases in patients with osteosarcoma.

Table 2: Staging procedures 
  • Thoracic computed tomography (CT)

  • Bone scintigram or alternatively whole-body FDG-Positron Emission Tomography/CT or FDG-PET/MRI

Table 3: Optional diagnostic procedures 


  • CBC and leukocyte differentiation

  • Serum chemistry (incl. alkaline phosphatase and lactate dehydrogenase)

  • Coagulation parameters

  • Virology (hepatitis A-C, HIV)

Functional diagnostics

  • Echocardiography, ECG

  • Creatinine clearance

  • Audiometry

  • Pulmonary function diagnostics in case of pulmonary metastases

No specific laboratory biomarkers exist for osteosarcoma. Certain parameters should be determined before or also in the course of neo- and adjuvant chemotherapy.

Functional diagnostic tests are used to assess treatment feasibility before or to assess organ toxicities during chemotherapy. For patients with the desire for children, fertility-preserving measures should be discussed at an early stage and carried out if necessary.


5.2.1Histological subtypes

Histological classification is based on the current WHO classification for tumors of soft tissue and bone (2020). Most osteosarcomas are highly malignant tumors (high grade; G3), but cases of intermediate (G2) or low malignancy (G1) also occur (see Table 4).

The most common are the highly malignant conventional osteosarcomas (80-90%), which arise in the medullary cavity of the bone (intramedullary). Parosteal and periosteal osteosarcomas arise from the bone surface.

Extraskeletal osteosarcomas are classified as soft tissue sarcomas according to the WHO classification.

Rarely, multifocal osteosarcoma may occur. In this case, it is difficult to distinguish whether the lesions are multiple, synchronous, primary osteosarcomas or metastases.

Secondary osteosarcomas occur, for example, in the context of Paget's disease of the bone or following irradiation.

Table 4: WHO classification of osteosarcoma 2020 (modified)  

Malignancy grade

Osteosarcoma subtype

Grade 1 (low-grade)

  • Parosteal osteosarcoma

  • Low-grade malignant central osteosarcoma

Grade 2 (intermediate)

  • Periosteal osteosarcoma

Grade 3 (high-grade)

  • Osteosarcoma with the following subtypes:

    • Conventional osteosarcoma*

    • Teleangiectatic osteosarcoma

    • Small cell osteosarcoma

  • High-grade malignant surface osteosarcoma

*Conventional osteosarcoma is subdivided into osteoblastic, chondroblastic, and fibroblastic types depending on the histologic pattern. Morphologic variants such as giant cell-rich, osteoblastoma-like, or epithelioid osteosarcoma are also attributed to conventional osteosarcoma.


Classification of the extent of the primary tumor and metastasis is based on the American Joint Committee on Cancer (AJCC) TNM criteria (see Table 5).

Table 5: TNM classification of bone tumors  

T - primary tumor


Primary tumor cannot be assessed


No evidence of primary tumor


Extremity skeleton, trunk, skull and facial bones


Tumor 8 cm or less in greatest extension


Tumor more than 8 cm in greatest extension


Discontinuous spread in the primary affected bone




Tumor limited to a single vertebral segment* or two adjacent vertebral segments


Tumor limited to three adjacent vertebral segments*.


Tumor limited to four adjacent vertebral segments*.


Tumor infiltrates the spinal canal


Tumor infiltrates the great vessels or tumor thrombosis within the great vessels

*the five spinal segments are: right pedicle, right vertebral body, left vertebral body, left pedicle, posterior element.




Tumor 8 cm or less in greatest extent and confined to a single segment* of the pelvis without extraosseous spread


Tumor more than 8 cm in greatest extent and confined to a single segment* of the pelvis without extraosseous spread


Tumor 8 cm or less in greatest extent and confined to a single segment* of the pelvis with extraosseous spread or two adjacent segments* of the pelvis without extraosseous spread


Tumor more than 8 cm in greatest extent and confined to a single segment* of the pelvis with extraosseous spread or two adjacent segments* of the pelvis without extraosseous spread


Tumor 8 cm or less in greatest extent and confined to two adjacent segments* of the pelvis with extraosseous spread


Tumor more than 8 cm in greatest extent and confined to two adjacent segments* of the pelvis with extraosseous spread


Tumor involving three segments* of the pelvis or crossing the sacroiliac joint into the sacral neuroforamen


Tumor encircles the external iliac vessels or macroscopically demonstrable tumor thrombosis in large iliac vessels

*the four pelvic segments are: Os sacrum, pelvic scapula, acetabulum/periacetabulum and pelvic branches, symphysis.


N - Regional lymph nodes


Regional lymph nodes cannot be assessed


No regional lymph node metastases


Regional lymph node metastases


M - distant metastases


No distant metastases


Distant metastases


Pulmonary metastases


Other distant metastases


Stage grouping (limb skeleton, trunk, skull, facial bones)

Stage IA


N0 M0

G1/GX Low grade

Stage IB

T2, T3

N0 M0

G1/GX Low grade

Stage IIA


N0 M0

G2, G3 High grade

Stage IIB


N0 M0

G2, G3 High grade

Stage III


N0 M0

G2, G3 High

Stage IVA

Each T

N0 M1a

Each G

Stage IVB

Each T

N1 Each M

Each G

Each T

Any N M1b

Each G


6.1Treatment structure

Treatment decisions for patients with osteosarcoma should be made in a multidisciplinary tumor board and at a center experienced in treating osteosarcoma patients.

In the case of localized high-grade osteosarcoma, occult metastasis must be assumed at the time of initial diagnosis. Therefore, neoadjuvant chemotherapy is usually administered, followed by resection and subsequent adjuvant chemotherapy. If the primary tumor has already been resected, all chemotherapy is adjuvant. The algorithm for first-line therapy is shown in Figure 3.

Figure 3: Treatment of osteosarcoma 
= curative intended therapy, = palliative therapy
*includes additionally neoadjuvant intended therapy, if primary surgery has been performed

6.1.1First-line therapy osteosarcomas

In low-grade osteosarcomas (parosteal and low-malignant central osteosarcoma), therapy is primarily surgical due to the low metastatic potential. However, in case of detection of a high-grade component (dedifferentiation), chemotherapy may be considered [12]. Smaller dedifferentiated areas are not yet a clear indication for chemotherapy in low-malignant central osteosarcoma [1314]. osteosarcoma

In patients with periosteal osteosarcoma (intermediate risk), a benefit from chemotherapy has not yet been demonstrated [1315]. osteosarcoma

The value of chemotherapy for high-grade osteosarcoma from the time of primary diagnosis is unequivocal. Although no survival advantage has been formally shown for neoadjuvant/adjuvant versus adjuvant chemotherapy alone [16], the concept of neoadjuvant/adjuvant chemotherapy is preferred. This is especially true if an improvement in surgical resectability can be achieved by preoperative systemic treatment [61718].

Response to neoadjuvant chemotherapy is considered an important prognostic factor. It has been shown that 5-year survival rates are much higher for patients with good histopathologic response (≥ 90% necrosis rate) than for patients with lower response (71-80% and 45-60% necrosis rate, respectively) [6][1921].

Doxorubicin, cisplatin, high-dose methotrexate (HD-MTX), and ifosfamide have proven antitumor efficacy in osteosarcoma and are used as part of first-line therapy. Different chemotherapy protocols are recommended depending on patient age. HD-MTX at a dose of 12 g/m2 is used as a standard regimen only in younger patients (≤ 40 years), due to higher toxicity, and is replaced by ifosfamide in older age groups. In case of poor response to ifosfamide, there is an option to supplement HD-MTX with a slightly lower dose of 8 g/m2 (see below).

Retrospective data have shown that the time interval between tumor resection and the start of adjuvant chemotherapy has an impact on prognosis [22]. Adjuvant chemotherapy should therefore be started within 21 days of resection, if possible.

Patients in whom metastasis has already been detected at first diagnosis have a worse prognosis than patients with local tumor detection only. Lung metastases are prognostically more favorable than bone metastases. Nevertheless, long-term survival of 10-50% can be achieved even in these patients by multimodal treatment protocols with chemotherapy and resection (primary tumor and metastases) [2325]. Regarding the choice of chemotherapy, patients with primary metastatic disease are treated in the same way as patients with localized osteosarcoma. up to 40 years of age

The treatment in this patient cohort is analogous to the standard arm in the EURAMOS-1 protocol with HD-MTX (12 g/m2), doxorubicin and cisplatin (MAP chemotherapy; Figure 4). The first 2 cycles of MAP are neoadjuvant. This is followed postoperatively by 2 additional cycles of MAP and 2 cycles of HD-MTX and doxorubicin (MA). Addition of further agents or intensification of chemotherapy depending on histologic response in the EURAMOS-1 trial had not resulted in improved treatment outcomes, but in increased toxicity [102627].

Figure 4: MAP chemotherapy protocol 
MAP chemotherapy protocol

Based on the results of a randomized American trial, which showed an overall survival benefit after the addition of the immunomodulator liposomal muramyl tripeptide phosphatidyl ethanolamine (L-MTP-PE) to postoperative chemotherapy, this agent was approved in combination with chemotherapy for the treatment of completely resected localized osteosarcoma in patients younger than 30 years of age [28]. However, according to various European and American osteosarcoma groups, these data are not sufficient to support the routine use of this agent outside of controlled clinical trials [29]. older than 40 years

Due to the poorer tolerability of HD-MTX in this age group, therapy is analogous to the Euro-B.O.S.S. protocol with doxorubicin, cisplatin, and ifosfamide (Figure 5) [30]. Poor histologic response is also considered a negative prognostic factor for elderly patients. The addition of HD-MTX at a reduced dose (8 g/m²) offers an additional option in this case (< 50% necrosis or Salzer-Kuntschik grade 5-6) [30].

Figure 5: Euro B.O.S.S. protocol 
Euro B.O.S.S. protocol craniofacial osteosarcoma/jaw osteosarcoma

Although the risk of distant metastasis is considered to be somewhat lower, therapy of high-grade craniofacial osteosarcoma/jaw osteosarcoma should be performed in analogy to high-grade osteosarcoma in other locations [7]. The prognosis after multimodal treatment with preoperative and/or postoperative chemotherapy is considered good [3033]. Because of the localization, which is usually difficult to access surgically, administration of all perioperative chemotherapy in the neoadjuvant setting with close monitoring may prove beneficial [34].

6.2Local therapy


Surgery should be performed exclusively by surgeons experienced in bone sarcoma surgery who are also proficient in the required reconstructive techniques. Achieving R0 resection is the defined goal of surgery. In most cases, an extremity-preserving approach is possible.

It is desirable to perform the biopsy of an osteosarcoma at the same specialized center where the subsequent tumor resection is to be performed. A large retrospective analysis of data from the Cooperative Osteosarcoma Study Group (COSS) showed that the risk of local recurrence after an out-of-center biopsy is more than twice as high as when the biopsy is performed in the center [35] - a staggering finding considering that the development of local recurrence is associated with a dramatic worsening of the probability of survival. The same analysis further emphasized the importance of treating patients in experienced centers, as limb preservation could be realized in 70% of patients in high-volume clinics compared with 51% in low-volume clinics [35].

Depending on the extent of bone destruction, there is a risk of pathologic fracture, especially in the region of the long tubular bones [35], which may be further increased after open biopsies. To reduce the risk of pathologic fracture in the long tubular bone region during neoadjuvant chemotherapy, temporary lower weight-bearing or even complete unloading of the affected lower extremity may be useful. However, unloading is also associated with muscle atrophy and secondary osteopenia, so it cannot be recommended as a standard. Since there is no established risk score for the development of pathologic fractures, the question of the need for lower weight-bearing or unloading must be discussed individually with the primary orthopedist or trauma surgeon who takes the biopsy.

Taking into account the frequently metaphyseal localization of osteosarcoma in the extremities, defect reconstruction using tumor endoprostheses is preferred, with the advantages of rapid full weight-bearing of the affected limb and a good functional outcome. The 5-year implant survival is 78% for proximal femoral replacement, 65% for distal femoral replacement, and 61% for proximal tibial replacement. The most common reason for secondary amputation is local recurrence (63%) followed by periprosthetic infection (34%) [36].

In very young patients (< 5 years of age), the amputation rate is significantly increased because of limited reconstruction options. In the case of osteosarcomas in the femur and proximal tibia, rotationplasty is a reasonable alternative to amputation or implantation of growth endoprostheses in slightly older children. Rotationplasty is generally a one-time surgical procedure. With the appropriate prosthetic fitting, patients are functionally and emotionally almost in line with the general population [37].


Radiation therapy may be considered for primary unresectable primary tumors or as adjuvant therapy in cases of high local recurrence risk and lack of options for R0 resection. Osteosarcoma is considered relatively resistant to radiation. Therefore, modern, highly conformal radiotherapy techniques such as IMRT or particle therapy with protons or heavy ions should be considered especially in case of curative intention in order to achieve high local doses. In case of R0 resection, there is no indication for adjuvant radiotherapy. However, radiotherapy can be used in a palliative treatment approach as an alternative to surgery and also symptom-directed therapy of metastases.

6.2.3Local therapy of metastases

Treatment of patients with primary metastatic osteosarcoma may follow the same principles as in patients without metastasis. In patients with lung metastases only, in whom all foci can be surgically removed, the 5-year survival may be as high as 44%. If other regions were also affected, 5-year survival was only 19% [38]. For palliative treatment of metastases in cases of fracture risk or pain, local radiotherapy may be considered.

Since L-MTP-PE has not resulted in any survival benefit in this group of patients, it should not be used outside of clinical trials in this setting either [39].

6.3Special settings


Therapy in case of recurrence or metastasis depends on the time interval to primary therapy as well as the number and location of metastases [38]. For example, a preceding disease-free interval of 18 to 24 months, a maximum of 2 pulmonary metastases, and unilateral pulmonary involvement without pleural involvement are considered favorable prognostic factors.

Treatment should preferably be performed at an experienced center. resectable disease

Therapy is primarily surgical if complete removal of the local recurrence and/or metastases can be achieved. About 1/3 of patients after 2nd surgical remissions survive longer than 5 years [40]. This is also true for repeated recurrences. If a surgical approach is not possible, alternative procedures such as (stereotactic) radiotherapy, radiofrequency ablation (RFA) or cryotherapy can be used to treat lung metastases [7]. RFA and (stereotactic) radiotherapy can optionally also be used for the therapy of bone metastases [41].

The role of renewed adjuvant chemotherapy after achieving a 2nd surgical remission is not clear. Thus, retrospective analyses showed either no benefit, a benefit only in a subgroup (e.g., patients with ≥ 3 pulmonary metastases), or a small benefit [384042]. We recommend that in patients with early recurrence (within 12 months), multiple metastases (≥ 3 lung metastases), or pleural involvement, the use of second-line chemotherapy in addition to resection of all manifest tumor sites should be considered. Carboplatin and etoposide, high-dose ifosfamide alone or in combination with etoposide, gemcitabine, and docetaxel [4345], and cyclophosphamide and topotecan [46] may be used. Patients with late solitary pulmonary recurrence do not benefit from additional salvage chemotherapy, according to current knowledge [47]. Further treatment in terms of maintenance therapy is not standard of care in second complete remission. disease

Patients with non-resectable local recurrence or extensive metastasis are treated with palliative intent. In these patients, presentation to a molecular tumor board should be considered.

Depending on the general condition and the chemotherapy given so far, the same therapy regimens as in chapter can be considered. In addition to classical chemotherapeutic agents, the use of molecularly targeted drugs (alone or in combination), for which a prolongation of the progression-free interval has been reported from phase I/II studies, can also be considered (e.g. sorafenib plus/minus everolimus [4849], gemcitabine/sirolimus [50], regorafenib [5152] or cabozantinib [53]).

Current studies also focus on the use of immune checkpoint inhibitors (ICI) in patients with advanced or metastatic osteosarcoma. In case of proven microsatellite instability (MSI-H) or mismatch repair deficiency (dMMR) or high tumor mutation burden (TMB-H), treatment with pembrolizumab or nivolumab/ipilimumab may be discussed [5456].


Surgery, radiation therapy and systemic tumor therapy can lead to therapy sequelae of varying severity that require targeted rehabilitative measures. In addition, there are the special psychological and social effects of cancer in adolescents and young adults.

Patients should be informed at an early stage about the possibilities of outpatient and inpatient rehabilitation measures as well as other claims arising from social law. With regard to the rehabilitation clinic, the patients' wishes should be taken into account (§9 SGB IX). Nevertheless, a recommendation should be made for a clinic with an oncological focus, which has special experience also in the age group of osteosarcoma patients. Furthermore, experience with patients after major tumor operations of the skeletal system is useful to ensure focussed physiotherapy.


The aim of follow-up procedures is the early detection of local recurrence or metastasis with the possibility of initiating specific therapy as early as possible, as well as the detection of late effects of therapy.

Follow-up (Table 6) includes a physical examination, chest radiography or alternatively low-dose chest CT (HR-CT), conventional radiography and MRI of the primary tumor region, and late follow-up diagnostic tests. Imaging intervals are every 3 months for the first 2 years, semiannually for the 3rd to 5th years, and then annually until 10 years after primary diagnosis. If recurrence is suspected, FDG-PET/CT or FDG-PET MRI may be helpful in individual cases.

Table 6: Follow-up schedule 


Time/interval (months)



>5 years

Every 3 months

Every 6 months

1 x yearly

X-ray thorax or CT thorax




X-ray primary tumor region




MRI primary tumor region





  1. Bielack SS, Machatschek JN, Flege S, Jürgens H. Delaying surgery with chemotherapy for osteosarcoma of the extremities. Expert Opin Pharmacother 2004;5:1243-1256. DOI:10.1517/14656566.5.6.1243.

  2. Bernthal NM, Federman N, Eilber FR et al. Long-term results (>25 years) of a randomized, prospective clinical trial evaluating chemotherapy in patients with high-grade, operable osteosarcoma. Cancer 2012;118:5888-5893. DOI:10.1002/cncr.27651.

  3. Anninga JK, Gelderblom H, Fiocco M et al. Chemotherapeutic adjuvant treatment for osteosarcoma: where do we stand? Eur J Cancer 2011;47:2431-2445. DOi:10.1016/j.ejca.2011.05.030

  4. Ozaki T, Flege S, Liljenqvist U et al. Osteosarcoma of the spine: experience of the Cooperative Osteosarcoma Study Group. Cancer 2002;94:1069-1077. PMID:11920477.

  5. Bielack S, Jürgens H, Jundt G et al. Osteosarcoma: the COSS experience. Cancer Treat Res 2009;152:289-308. DOI:10.1007/978-1-4419-0284-9_15.

  6. Bielack SS, Kempf-Bielack B, Delling G et al. Prognostic factors in high-grade osteosarcoma of the extremities or trunk: an analysis of 1,702 patients treated on neoadjuvant cooperative osteosarcoma study group protocols. J Clin Oncol 2002;20:776-790. DOI:10.1200/JCO.2002.20.3.776.

  7. Strauss SJ, Frezza AM, Abecassis N et al. Bone sarcomas: ESMO-EURACAN-GENTURIS-ERN PaedCan Clinical Practice Guideline for diagnosis, treatment and follow-up. Ann Oncol 2021;32:1520-1536. DOI:10.1016/j.annonc.2021.08.1995.

  8. Smida J, Baumhoer D, Rosemann M et al. Genomic alterations and allelic imbalances are strong prognostic predictors in osteosarcoma. Clin Cancer Res 2010;16:4256-4267. DOI:10.1158/1078-0432.CCR-10-0284.

  9. Kovac M, Blattmann C, Ribi S et al. Exome sequencing of osteosarcoma reveals mutation signatures reminiscent of BRCA deficiency. Nat Commun 2015;6:8940. DOI:10.1038/ncomms9940.

  10. Smeland S, Bielack SS, Whelan J et al. Survival and prognosis with osteosarcoma: outcomes in more than 2000 patients in the EURAMOS-1 (European and American Osteosarcoma Study) cohort. Eur J Cancer 2019;109:36-50. DOI:10.1016/j.ejca.2018.11.027.

  11. Kaste SC, Pratt CB, Cain AM, Jones-Wallace DJ, Rao BN. Metastases detected at the time of diagnosis of primary pediatric extremity osteosarcoma: imaging features. Cancer 1999;86:1602-1608. DOI:10.1002/(sici)1097-0142(19991015)86:8<1602::aid-cncr31>3.0.co;2-r

  12. Ruengwanichayakun P, Gambarotti M, Frisoni T et al. Parosteal osteosarcoma: a monocentric retrospective analysis of 195 patients. Hum Pathol 2019;91:11-18. DOI:10.1016/j.humpath.2019.05.009

  13. Berner K, Johannesen TB, Bruland ØS. Clinical epidemiology of low-grade and dedifferentiated osteosarcoma in Norway during 1975 and 2009. Sarcoma 2015;2015:917679. DOI:10.1155/2015/917679.

  14. Grimer RJ, Bielack S, Flege S et al. Periosteal osteosarcoma - a European review of outcome. European journal of cancer 2005;41:2806-2811. DOI:10.1016/j.ejca.2005.04.052.

  15. Cesari M, Alberghini M, Vanel D et al. Periosteal osteosarcoma: a single-institution experience. Cancer 2011;117:1731-1735. DOI:10.1002/cncr.25718.

  16. Goorin AM, Schwartzentruber DJ, Devidas M et al. Presurgical chemotherapy compared with immediate surgery and adjuvant chemotherapy for nonmetastatic osteosarcoma: Pediatric Oncology Group Study POG-8651. J Clin Oncol 2003;21:1574-1580. DOI:10.1200/JCO.2003.08.165.

  17. Grohar PJ, Janeway KA, Mase LD, Schiffman JD. Advances in the treatment of pediatric bone sarcomas. Am Soc Clin Oncol Educ Book 2017;37:725-735. DOI:10.1200/EDBK_175378.

  18. Bielack S, Cable MG, Gorlick R et al. Osteosarcoma - approach to therapy. In: Arndt CAS, ed. Sarcomas of Bone and Soft Tissues in Children and Adolescents. Cham: Springer International Publishing; 2021:91-109. DOI:10.1007/978-3-030-51160-9_8.

  19. Bacci G, Bertoni F, Longhi A et al. Neoadjuvant chemotherapy for high-grade central osteosarcoma of the extremity. Histologic response to preoperative chemotherapy correlates with histologic subtype of the tumor. Cancer 2003;97:3068-3075. DOI:10.1002/cncr.11456.

  20. Hauben EI, Weeden S, Pringle J, Van Marck EA, Hogendoorn PC. Does the histological subtype of high-grade central osteosarcoma influence the response to treatment with chemotherapy and does it affect overall survival? A study on 570 patients of two consecutive trials of the European Osteosarcoma Intergroup. Eur J Cancer 2002;38:1218-1225. DOI:10.1016/s0959-8049(02)00037-0.

  21. Bacci G, Longhi A, Versari M, Mercuri M, Briccoli A, Picci P. Prognostic factors for osteosarcoma of the extremity treated with neoadjuvant chemotherapy: 15-year experience in 789 patients treated at a single institution. Cancer 2006;106:1154-1161. DOI:10.1002/cncr.21724.

  22. Imran H, Enders F, Krailo M et al. Effect of time to resumption of chemotherapy after definitive surgery on prognosis for non-metastatic osteosarcoma. J Bone Joint Surg Am 2009;91:604-612. DOI:10.2106/JBJS.H.00449.

  23. Mialou V, Philip T, Kalifa C et al. Metastatic osteosarcoma at diagnosis: prognostic factors and long-term outcome - the French pediatric experience. Cancer 2005;104:1100-1109. DOI:10.1002/cncr.21263.

  24. Kager L, Zoubek A, Pötschger U et al. Primary metastatic osteosarcoma: presentation and outcome of patients treated on neoadjuvant Cooperative Osteosarcoma Study Group protocols. J Clin Oncol 2003 May;21:2011-2018. DOI:10.1200/JCO.2003.08.132.

  25. Aljubran AH, Griffin A, Pintilie M, Blackstein M. Osteosarcoma in adolescents and adults: survival analysis with and without lung metastases. Ann Oncol 2009;20:1136-1141. DOI:10.1093/annonc/mdn731 Erratum in: Ann Oncol 2021;32:424. PMID:19153114.

  26. Bielack SS, Smeland S, Whelan JS et al. methotrexate, doxorubicin, and cisplatin (MAP) plus maintenance pegylated interferon alfa-2b versus MAP alone in patients with resectable high-grade osteosarcoma and good histologic response to preoperative MAP: first results of the EURAMOS-1 good response randomized controlled trial. J Clin Oncol 2015;33:2279-2287. doi: 10.1200/JCO.2014.60.0734. Erratum in: J Clin Oncol 2016;34:4059. PMID:26033801.

  27. Marina NM, Smeland S, Bielack SS et al. Comparison of MAPIE versus MAP in patients with a poor response to preoperative chemotherapy for newly diagnosed high-grade osteosarcoma (EURAMOS-1): an open-label, international, randomised controlled trial. Lancet Oncol 2016;17:1396-1408. DOI:10.1016/S1470-2045(16)30214-5.

  28. Meyers PA, Schwartz CL, Krailo MD et al. Osteosarcoma: the addition of muramyl tripeptide to chemotherapy improves overall survival - a report from the Children's Oncology Group. J Clin Oncol 2008;26:633-638. DOI:10.1200/JCO.2008.14.0095.

  29. Bielack SS, Marina N, Ferrari S et al. Osteosarcoma: the same old drugs or more? J Clin Oncol 2008;26:3102-3103. DOI:10.1200/JCO.2008.17.1108.

  30. Ferrari S, Bielack SS, Smeland S et al. EURO-B.O.S.S.: A European study on chemotherapy in bone-sarcoma patients aged over 40: outcome in primary high-grade osteosarcoma. Tumori 2018;104:30-36. DOI:10.5301/tj.5000696.

  31. Jasnau S, Meyer U, Potratz J et al. Craniofacial osteosarcoma Experience of the cooperative German-Austrian-Swiss osteosarcoma study group. Oral Oncol 2008;44:286-294. DOI:10.1016/j.oraloncology.2007.03.001.

  32. Thariat J, Julieron M, Brouchet A et al. Osteosarcomas of the mandible: are they different from other tumor sites? Crit Rev Oncol Hematol 2012;82:280-295. DOI:10.1016/j.critrevonc.2011.07.001.

  33. Baumhoer D, Brunner P, Eppenberger-Castori S, Smida J, Nathrath M, Jundt G. Osteosarcomas of the jaws differ from their peripheral counterparts and require a distinct treatment approach. Experiences from the DOESAK Registry. Oral Oncol 2014;50:147-153. DOI:10.1016/j.oraloncology.2013.10.017.

  34. Frezza AM, Beale T, Bomanji J et al. Is [F-18]-fluorodeoxy-D-glucose positron emission tomography of value in the management of patients with craniofacial bone sarcomas undergoing neo-adjuvant treatment? BMC Cancer 2014;14:23. DOI:10.1186/1471-2407-14-23.

  35. Andreou D, Bielack SS, Carrle D et al. The influence of tumor- and treatment-related factors on the development of local recurrence in osteosarcoma after adequate surgery. An analysis of 1355 patients treated on neoadjuvant Cooperative Osteosarcoma Study Group protocols. Ann Oncol 2011;22:1228-1235. DOI:10.1093/annonc/mdq589.

  36. Hardes J, Guder W, Dudda M, Nottrott M, Podleska LE, Streitburger A. Aktuelle Ergebnisse der Tumorendoprothetik bei Jugendlichen und Erwachsenen [Current results of tumor endoprosthetics in adolescents and adults]. Orthopade 2019;48:744-751. English. DOI:10.1007/s00132-019-03788-5

  37. Grimsrud C, Killen C, Murphy M, Wang H, McGarry S. Long-term outcomes of rotationplasty patients in the treatment of lower extremity sarcomas with cost analysis. J Clin Orthop Trauma 2020;11(Suppl 1):S149-S152. DOI:10.1016/j.jcot.2019.06.003

  38. Ferrari S, Briccoli A, Mercuri M et al. Postrelapse survival in osteosarcoma of the extremities: prognostic factors for long-term survival. J Clin Oncol 2003;21:710-715. DOI:10.1200/JCO.2003.03.141.

  39. Chou AJ, Kleinerman ES, Krailo MD et al. Addition of muramyl tripeptide to chemotherapy for patients with newly diagnosed metastatic osteosarcoma: a report from the Children's Oncology Group. Cancer 2009;115:5339-5348. DOI:10.1002/cncr.24566.

  40. Kempf-Bielack B, Bielack SS, Jürgens H et al. Osteosarcoma relapse after combined modality therapy: an analysis of unselected patients in the Cooperative Osteosarcoma Study Group (COSS). J Clin Oncol 2005;23:559-568. DOI:10.1200/JCO.2005.04.063.

  41. de Baere T, Tselikas L, Gravel G et al. Interventional radiology: role in the treatment of sarcomas. Eur J Cancer 2018;94:148-155. DOI:10.1016/j.ejca.2018.02.017.

  42. Palmerini E, Torricelli E, Cascinu S et al. Is there a role for chemotherapy after local relapse in high-grade osteosarcoma? Pediatr Blood Cancer 2019;66:e27792. DOI:10.1002/pbc.27792

  43. Gazouli I, Kyriazoglou A, Kotsantis I et al. Systematic review of recurrent osteosarcoma systemic therapy. Cancers (Basel) 2021;13:1757. DOI:10.3390/cancers13081757.

  44. Palmerini E, Jones RL, Marchesi E et al. Gemcitabine and docetaxel in relapsed and unresectable high-grade osteosarcoma and spindle cell sarcoma of bone. BMC Cancer 2016;16:280. DOI:10.1186/s12885-016-2312-3.

  45. Navid F, Willert JR, McCarville MB et al. Combination of gemcitabine and docetaxel in the treatment of children and young adults with refractory bone sarcoma. Cancer 2008;113:419-425. DOI:10.1002/cncr.23586.

  46. Saylors RL, 3rd, Stine KC, Sullivan J et al. Cyclophosphamide plus topotecan in children with recurrent or refractory solid tumors: a Pediatric Oncology Group phase II study. J Clin Oncol 2001;19:3463-3469. DOI:10.1200/JCO.2001.19.15.3463.

  47. Daw NC, Chou AJ, Jaffe N et al. Recurrent osteosarcoma with a single pulmonary metastasis: a multi-institutional review. Br J Cancer 2015;112:278-282. DOI:10.1038/bjc.2014.585.

  48. Grignani G, Palmerini E, Ferraresi V et al. Sorafenib and everolimus for patients with unresectable high-grade osteosarcoma progressing after standard treatment: a non-randomised phase 2 clinical trial. Lancet Oncol 2015;16:98-107. DOI:10.1016/S1470-2045(14)71136-2.

  49. Grignani G, Palmerini E, Dileo P et al. A phase II trial of sorafenib in relapsed and unresectable high-grade osteosarcoma after failure of standard multimodal therapy: an Italian Sarcoma Group study. Ann Oncol 2012;23:508-516. DOI:10.1093/annonc/mdr151.

  50. Martin-Broto J, Redondo A, Valverde C et al. Gemcitabine plus sirolimus for relapsed and progressing osteosarcoma patients after standard chemotherapy: a multicenter, single-arm phase II trial of Spanish Group for Research on Sarcoma (GEIS). Ann Oncol 2017;28:2994-2999. DOI:10.1093/annonc/mdx536.

  51. Duffaud F, Mir O, Boudou-Rouquette P et al. Efficacy and safety of regorafenib in adult patients with metastatic osteosarcoma: a non-comparative, randomised, double-blind, placebo-controlled, phase 2 study. Lancet Oncol 2019;20:120-133. DOI:10.1016/S1470-2045(18)30742-3.

  52. Davis LE, Bolejack V, Ryan CW et al. Randomized double-blind phase II study of regorafenib in patients with metastatic osteosarcoma. J Clin Oncol 2019;37:1424-1431. DOI:10.1200/JCO.18.02374.

  53. Italiano A, Mir O, Mathoulin-Pelissier S et al. Cabozantinib in patients with advanced Ewing sarcoma or osteosarcoma (CABONE): a multicentre, single-arm, phase 2 trial. Lancet Oncol 2020;21:446-455. DOI:10.1016/S1470-2045(19)30825-3.

  54. Marabelle A, Fakih M, Lopez J et al. Association of tumour mutational burden with outcomes in patients with advanced solid tumours treated with pembrolizumab: prospective biomarker analysis of the multicohort, open-label, phase 2 KEYNOTE-158 study. Lancet Oncol 2020;21:1353-1365. DOI:10.1016/S1470-2045(20)30445-9.

  55. Marabelle A, Le DT, Ascierto PA et al. Efficacy of pembrolizumab in patients with noncolorectal high microsatellite instability/mismatch repair-deficient cancer: results from the phase II KEYNOTE-158 study. J Clin Oncol 2020;38:1-10. DOI:10.1200/JCO.19.02105.

  56. Schenker M, Burotto M, Richardet M et al. Abstract CT022: CheckMate 848: A randomized, open-label, phase 2 study of nivolumab in combination with ipilimumab or nivolumab monotherapy in patients with advanced or metastatic solid tumors of high tumor mutational burden. Cancer research 2022;82(12_supplement):CT022-CT022. DOI:10.1158/1538-7445.AM2022-CT022

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15Authors' Affiliations

Prof. Dr. Lars H. Lindner
Campus Großhadern
Medizinische Klinik und Poliklinik III
81377 München
PD Dr. Dimosthenis Andreou
Medizinische Universität Graz
Klinik für Orthopädie und Traumatologie
Auenbruggerplatz 5/6
A-8036 Graz
Prof. Dr. Sebastian Bauer
Universitätsklinikum Essen
Innere Klinik (Tumorforschung)
Westdeutsches Tumorzentrum
Hufelandstr. 55
45122 Essen
Prof. Dr. Stefan Bielack
Klinikum Stuttgart
Pädiatrie 5 – Onkologie, Hämatologie und Immunologie
Kriegsbergstr. 60
70174 Stuttgart
Dr. med. Matthias Grube
Universitätsklinikum Regensburg
Innere Medizin III
Franz-Josef-Strauß-Allee 11
93042 Regensburg
Prof. Dr. Wolfgang Hartmann
Universitätsklinikum Münster
Gerhard-Domagk-Institut für Pathologie
Domagkstr. 17
48149 Münster
Dr. Stefanie Hecker-Nolting
Klinikum Stuttgart
Pädiatrie 5 – Onkologie, Hämatologie und Immunologie
Kriegsbergstr. 60
70174 Stuttgart
PD Dr. Attila Kollàr
Inselspital, Universitätsspital Bern
Universitätsklinik für Medizinische Onkologie
CH-3010 Bern
Dr. med. Klaus Kraywinkel
Zentrum für Krebsregisterdaten
Robert Koch-Institut
General-Pape-Straße 62-66
12101 Berlin
PD Dr. Joanna Szkandera
Medizinische Universität Graz
Klinische Abteilung für Onkologie
Auenbruggerplatz 15
A-8036 Graz
Prof. Dr. Beate Timmermann
Universitätsklinikum Essen
Westdeutsches Protonentherapiezentrum
Hufelandstr. 55
45122 Essen
Dr. med. Per Ulf Tunn
Helios-Klinikum Berlin-Buch
Klinik für Tumororthopädie
Schwanebecker Chaussee 50
13125 Berlin
Prof. Dr. Klaus Wörtler
Technische Universität München
Klinikum rechts der Isar
Diagnostische und Interventionelle Radiologie
Ismaninger Str. 22
81675 München


Author Employer1 Consulting / Expert opinion2 Shares / Funds3 Patent / Copyright / License 4 Fees5 Funding of scientific research6 Other financial relations7 Personal relationship with authorized representatives8
Andreou, Dimosthenis
Aktuell: Medizinische Universität Graz Davor: Helios Klinikum Bad Saarow
Honorare für Vortragstätigkeiten: PharmaMar
Bauer, Sebastian Conflict of interest declarations pending
Bielack, Stefan Conflict of interest declarations pending
Grube, Matthias
Medizinische Klinik und Poliklinik III Universitätsklinikum Regensburg 93042 Regensburg
Berater/Advisory Board der Firmen: - Janssen - Sanofi - Bayer
Hartmann, Wolfgang Conflict of interest declarations pending
Hecker-Nolting, Stefanie Conflict of interest declarations pending
Kollàr, Attila
Inselspital, Universitätsspital Bern Universitätsklinik für Medizinische Onkologie
Lilly, Bayer, PharmaMar, Amgen
PharmaMar, Vifor
Kraywinkel, Klaus
Robert Koch-Institut
Lindner, Lars H.
LMU Klinikum, München
Szkandera, Joanna
Medizinische Universität Graz
Advisory Board für PharmaMar, Lilly, Bayer
Vorträge für PharmaMar, Roche, Lilly
Forschungsförderung von PharmaMar, Roche, Eisai
Reisekostenerstattung für Kongresse von PharmaMar, Roche, Lilly
Timmermann, Beate Conflict of interest declarations pending
Tunn, Per Ulf
Helios Klinikum Berlin Buch Klinik für Tumororthopädie Schwanebecker Chaussee 50 13125 Berlin
Wörtler, Klaus
Klinikum rechts der Isar der TU München
1 - Current employer, relevant previous employers in the last 3 years (institution/location).
2 - Activity as a consultant or expert or paid participation in a scientific advisory board of a company in the health care industry (e.g., pharmaceutical industry, medical device industry), a commercially oriented contract research organization, or an insurance company.
3 - Ownership of business shares, stocks, funds with participation of companies of the health care industry.
4 - Relates to drugs and medical devices.
5 - Honoraria for lecturing and training activities or paid authors or co-authorships on behalf of a company in the health care industry, a commercially oriented contracting institute or an insurance company.
6 - Financial support (third-party funds) for research projects or direct financing of employees of the institution by a company in the health care industry, a commercially oriented contract institute or an insurance company.
7 - Other financial relationships, e.g., gifts, travel reimbursements, or other payments in excess of 100 euros outside of research projects, if paid by an entity that has an investment in, license to, or other commercial interest in the subject matter of the investigation.
8 - Personal relationship with an authorized representative(s) of a healthcare company.