Non-contrast computed tomography of head showing a large mass without any intracranial extension. The diagnosis was postauricular congenital alveolar rhabdomyosarcoma.
Classification and external resources
Specialty Oncology
ICD-10 C49.M50
ICD-9-CM 171.9
ICD-O M8900/3M8920/3
OMIM 268210
DiseasesDB 11485
MedlinePlus 001429
eMedicine ent/641 ped/2005
Patient UK Rhabdomyosarcoma
MeSH D012208

Rhabdomyosarcoma, or RMS, is an aggressive and highly malignant form of cancer that develops from skeletal (striated) muscle cells that have failed to fully differentiate. It is generally considered to be a disease of childhood, as the vast majority of cases occur in those below the age of 18. It is commonly described as one of the "small, round, blue cell tumours of childhood" due to its appearance on an H&E stain. Despite being a relatively rare cancer, it accounts for approximately 40% of all recorded soft tissue sarcomas.[1][2][3] RMS can occur in any site on the body, but is primarily found in the head, neck, orbit, genitourinary tract, genitals, and extremities. There are no clear risk factors for RMS, but the disease has been associated with some congenital abnormalities.[1][4] Signs and symptoms vary according to tumor site, and prognosis is closely tied to the location of the primary tumor. Common site of metastasis include the lungs, bone marrow, and bones.[5][6] There are many classification systems for RMS and a variety of defined histological types. Embryonal rhabdomyosarcoma is the most common type and comprises about 60% of cases.[7] Patient outcomes vary considerably, with 5 years survival rates between 35% and 95% depending on the type of RMS involved, so clear diagnosis is critical for effective treatment and management.[7][8] Unfortunately, accurate and quick diagnosis is often difficult due to the heterogeneity of RMS tumors and a lack of strong genetic markers of the disease. Treatment usually involves a combination of surgery, chemotherapy, and radiation. Sixty percent to 70% of newly diagnosed patients with nonmetastatic disease can be cured using this combined approach to therapy. Despite aggressive multimodality treatment, less than 20% of patients with metastatic RMS are able to be cured of their disease.[9]


Rhabdomyosarcoma is the most common soft-tissue sarcoma in children as well as the third most common solid tumor in children. Recent estimates place the incidence of the disease at approximately 4.5 case per 1 million children/adolescents with approximately 250 new cases in the United States each year.[10][11] RMS is primarily a disease of childhood, with the vast majority of cases occurring in children or adolescents. Two thirds of reported cases occur in children under the age of 10.[1] RMS also occurs slightly more often in males than in females, with a ratio of approximately 1.3–1.5:1. In addition, slightly lower prevalence of the disease has been reported in black and Asian children relative to white children.[12][13][14] In most cases, there are no clear predisposing risk factors for the development of RMS. It tends to occur sporadically with no obvious cause. However, RMS has been correlated with familial cancer syndromes and congenital abnormalities including neurofibromatosis type 1,[15] Beckwith-Wiedemann syndrome,[16][17] Li–Fraumeni syndrome,[18] cardio-facio-cutaneous syndrome,[19] and Costello syndrome.[20] It has also been associated with parental use of cocaine and marijuana.[21]

Signs and Symptoms

RMS can occur in almost any soft-tissue site in the body; the most common primary sites are genitourinary (24%), parameningeal (16%), extremity (19%), orbit (9%), other head and neck (10%), and miscellaneous other sites (22%).[1][4] RMS often presents as a mass, but signs and symptoms can vary widely depending on the site of the primary tumor. Genitourinary tumors may present with hematuria, urinary tract obstruction, and/or a scrotal or vaginal mass. Tumors that arise in the retroperitoneum and mediastrium can become quite large before producing signs and symptoms. Parameningeal tumors may present with cranial nerve dysfunction, symptoms of sinusitis, ear discharge, headaches, and facial pain. Orbital tumors often present with orbital swelling and proptosis. Extremity tumors generally present as a rapidly enlarging, firm mass in the relevant tissue. The cancer's prevalence in the head, face, and neck will often allow for earlier signs of the disease simply due to the obvious nature of tumors in these locations.[22] Despite the varying presentation and typically aggressive nature of the disease, RMS has the potential to be diagnosed and treated early. The fourth IRSG study found that 23% of patients were diagnosed in time for a complete resection of their cancer, and 15% had resection with only minimal remnants of the diseased cells.[23]


Photomicrograph showing nodules of tumor cells separated by hyalinised fibrous septae (50×, HE stain). Inset: Discohesive large tumor cells with hyperchromatic nucleus and scant cytoplasm (200×, HE stain). The diagnosis was postauricular congenital alveolar rhabdomyosarcoma.

Given the difficulty in diagnosing rhabdomyosarcoma, definitive classiciation of subsets has proven difficult. As a result, classification systems vary by institute and organization. However, rhabdomyosarcoma can be generally divided into three histological subsets:

Multiple classification systems have been proposed for guiding management and treatment, and the most recent and widely used classification system is the "International Classification of Rhabdomyosarcoma" or ICR. It was created by the IRSG in 1995 after their series of four multi-institutional trials aimed at studying the presentation, histology, epidemiology, and treatment of RMS (IRSG I–IV).[7] The ICR system is based on prognostic indicators identified in IRSG I–IV. Pleomorphic rhabdomyosarcoma usually occurs in adults rather than children, and is therefor not included in this system. Sclerosing rhabdomyosarcoma is also not included in this system due to its rare presentation and weak classification schema.

Prognostic Factors

Prognosis in rhabdomyosarcoma patients has been shown to be dependent on age, tumor site, resectability of tumor, tumor size, regional lymph node involvement, presence of metastasis, site and extent of metastasis, and biological and histopathological characteristics of the tumor cells.[11]


Rhabdomyosarcoma is often difficult to diagnosis due to its similarities to other cancers and varying levels of differentiation. It is loosely classified as one of the “small, round, blue-cell cancer of childhood” due to its appearance on an H&E stain. Other cancers that share this classification include neuroblastoma, Ewing sarcoma, and lymphoma, and a diagnosis of RMS requires confident elimination of these morphologically similar diseases.[22] The defining diagnostic trait for RMS is confirmation of malignant skeletal muscle differentiation with myogenesis (presenting as a plump, pink cytoplasm) under light microscopy.[1] Cross striations may or may not be present. Accurate diagnosis is usually accomplished through immunohistochemical staining for muscle-specific proteins such as myogenin, muscle-specific actin, desmin, D-myosin, and myoD1.[28][29][30] Myogenin, in particular, has been shown to be highly specific to RMS,[31] although the diagnostic significance of each protein marker may vary depending on the type and location of the malignant cells. The alveolar type of RMS tends to have stronger muscle-specific protein staining. Electron microscopy may also aid in diagnosis, with the presence of actin and myosin or Z bands pointing to a positive diagnosis of RMS.[1][29] Classification into types and subtypes is accomplished through further analysis of cellular morphology (alveolar spacings, presence of cambium layer, aneuploidy, etc.) as well as genetic sequencing of tumor cells. Some genetic markers, such as the PAX3-FKHR fusion gene expression in alveolar RMS, can aid in diagnosis. Open biopsy is usually required to obtain sufficient tissue for accurate diagnosis. All findings must be considered in context, as no one trait is a definitive indicator for RMS.


Following diagnosis and histopathological analysis, the patient will usually undergo magnetic resonance imaging (MRI), ultrasonography, and a bone scan in order to determine the extent of local invasion and metastasis. Further investigational techniques may be necessary depending on tumor sites. A parameningeal presentation of RMS will often require a lumbar puncture to rule out metastasis to the meninges. A paratesticular presentation will often require an abdominal CT to rule out local lymph node involvement, and so on. Patient outcomes are most strongly tied to the extent of the disease, so it is important to map its presence in the body as soon as possible in order to decide on a treatment plan.

The current staging system for rhabdomyosarcoma is unusual relative to most cancers. It utilizes a modified TNM (tumor-nodes-metastasis) system originally developed by the IRSG.[7][8][32] This system accounts for tumor size (> or <5 cm), lymph node involvement, tumor site, and presence of metastasis.[22][32] It grades on a scale of 1 to 4 based on these criteria. In addition, patients are sorted by clinical group (from the clinical groups from the IRSG studies) based on the success of their first surgical resection.[32] The current Children's Oncology Group protocols for the treatment of RMS categorize patients into one of four risk categories based on tumor grade and clinical group, and these risk categories have been shown to be highly predictive of outcome.[29][33]

Tumor Site Risk Classification
Head and neck (orbit), biliary tract, genitourinary (excluding bladder and prostate) Favorable
Cranial parameningial, bladder, extremities, prostate, other Unfavorable

Treatment and Outcomes

Treatment of rhabdomyosarcoma is a multidisciplinary practice involving the use of surgery, chemotherapy, radiation, and possibly immunotherapy. Surgery is generally the first step in a combined therapeutic approach. Resectability varies depending on tumor site, and RMS often presents in sites that don't allow for full surgical resection without significant morbidity and loss of function. Less than 20% of RMS tumors are fully resected with negative margins. Fortunately, rhabdomyosarcomas are highly chemosensitive, with approximately 80% of cases responding to chemotherapy. In fact, multi-agent chemotherapy is indicated for all patients with rhabdomyosarcoma. Before the use of adjuvant and neoadjuvant therapy involving chemotherapeutic agents, treatment solely by surgical means had a survival rate of <20%. Modern survival rates with adjuvant therapy are approximately 60–70%.[4][34]

There are two main methods of chemotherapy treatment for RMS. There is the VAC regimen, consisting of vincristin, actinomyocin D, and cyclophosphamide, and the IVA regimen, consisting of ifosfamide, vincristin, and actinomyocin D. These drugs are administered in 9–15 cycles depending on the staging of the disease and other therapies used.[29] Other drug and therapy combinations may also show additional benefit. Addition of doxorubicin and cisplatin to the VAC regimen was shown to increase survival rates of patients with alveolar-type, early-stage RMS in IRS study III, and this same addition improved survival rates and doubled bladder salvage rates in patients with stage III RMS of the bladder.[24][29]

Radiation therapy, which kill cancer cells with focused doses of radiation, is often indicated in the treatment of rhabdomyosarcoma, and the exclusion of this treatment from disease management has been shown to increase recurrence rates. Radiation therapy is used when resecting the entirety of the tumor would involve disfigurement or loss of important organs (eye, bladder, etc.). Generally, in any case where a lack of complete resection is suspected, radiation therapy is indicated.[22] Administration is usually following 6–12 weeks of chemotherapy if tumor cells are still present. The exception to this schedule is the presence of parameningeal tumors that have invaded the brain, spinal cord, or skull. In these cases radiation treatment is started immediately.[35][36] In some cases, special radiation treatment may be required. Brachytherapy, or the placement of small, radioactive “seeds” directly inside the tumor or cancer site, is often indicated in children with tumors of sensitive areas such as the testicles, bladder, or vagina. This reduces scattering and the degree of late toxicity following dosing.[37] Radiation therapy is more often indicated in higher stage classifications.

Immunotherapy is a more recent treatment modality that is still in development. This method involves recruiting and training the patient's immune system to target the cancer cells. This can be accomplished through administering small molecules designed to pull immune cells towards the tumors, taking immune cells pulled from the patient and training to attack tumors through presentation with tumor antigen, or other experimental methods. A specific example here would be presenting some of the patient's dendritic cells, which direct the immune system to foreign cells, with the PAX3-FKHR fusion protein in order to focus the patient's immune system to the malignant RMS cells. All cancers, including rhabdomyosarcoma, could potentially benefit from this new, immune-based approach.

Genetic Features

There are multiple genetic lesions associated with rhabdomyosarcoma, but there has been little consistent data demonstrating an association between specific genetic abnormalities and outcome. However, alveolar and embryonal types of RMS can be distinguished cytogenetically, and identification of specific genetic lesions can allow for accurate classification of the ARMS subtype when the histopathological findings are equivocal or unclear. This is valuable for clinical practice as the alveolar type presents a higher risk to the patient and will often require more aggressive treatment than the embryonal type. Up to 90% of alveolar RMS cases present with a translocations of t(2;13)(q35,q14) or, less commonly, t(1;13)(p36,q15).[38][39] Both involve the translocation of a DNA binding domain of PAX, a member of the Paired Box family of transcription factors, to a transactivation site on FKHR, a member of the forkhead/HNF-3 transcription factor family.[28] The t(2;13) translocation results in a fusion of the PAX3 gene with FKHR, while the t(1;13) translocation involves the fusion of PAX7 with FKHR.[40] PAX3 has a demonstrated role in muscle cell development, which supports its potential role in RMS. The t(2;13) translocation can result in the PAX3-FKHR fusion product, which is indicative of classic cystic ARMS.[40] Cases of ARMS presenting with this fusion protein are said to be fusion-positive and are associated with a poorer prognosis than fusion-negative ARMS.[41] Fortunately, the fusion protein presents a potential therapeutic target, but more research is needed to clarify the role of PAX3-FKHR in ARMS.

Embryonal RMS usually presents with a loss of heterozygosity (LOH) in the short arm of chromosome 11 (p11,15.5).[28][42] This region is associated with multiple oncogenes, and the potential loss-of-function of this region is likely associated with the loss of a tumor suppressor. However, the specific consequences of this LOH at (p11,15.5) have yet to be determined. The short arm of chromosome 11 is also the site of the insulin-like growth factor 2 gene (IGF-2), which is often over-expressed in RMS.

p53 loss-of-function is associated with many cancers including rhabdomyosarcoma,[43] and approximately 50% of RMS cases have been shown to carry some form of mutation to the p53 gene. Other oncogenes often associated with rhabdomyosarcoma, alebit with less frequency, include N-myc, N-ras, K-ras, p16, and c-Met.[28][44] However, it is unclear whether the mutation of the genes is directly related to the development of RMS. One study showed a that 35% of embryonal RMS tumors contained activating mutations in either N- or K-ras, and it is worth noting that ras activation has been shown to block myogenic differentiation, which could help explain its potential role in rhabdomyosarcogenesis.[45]


Rhabdomyosarcoma was first described by Weber, a German physician, in 1845,[46] but it wasn't until the paper by Arthur Stout in 1946 that RMS was formally classified.[47] The first thirty years of investigation were conducted by the Intergroup Rhabdomyosarcoma Study Group (IRSG), an independent National Cancer Institute (NCI)-funded cooperative that has become a part of the Children's Oncology Group.


Cancer stem cells of rhabdomyosarcoma have been identified and fibroblast growth factor receptor 3 has been suggested as their marker. Preclinical animal studies that try to use conditionally replicating adenoviruses against such cells are in progress.[48]

See also


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