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Embryonal and Alveolar Rhabdomyosarcoma in Adults: Real-Life Data From a Tertiary Sarcoma Centre.

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Adults with embryonal and alveolar rhabdomyosarcoma (ERMS, ARMS) have poor survival outcomes. This study highlights key prognostic factors and suggests collaborative trials for better understanding and treatment of these rare adult sarcomas.

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Area of Science:

  • Pediatric Oncology
  • Sarcoma Research
  • Clinical Oncology

Background:

  • Embryonal and alveolar rhabdomyosarcoma (ERMS, ARMS) are rare in adults, with significantly worse outcomes than in children.
  • Existing literature often combines ERMS and ARMS with pleomorphic RMS, limiting understanding of adult-specific ERMS/ARMS characteristics.
  • Data on adult ERMS and ARMS patient characteristics and prognostic factors are scarce.

Purpose of the Study:

  • To evaluate patient and tumor characteristics in adult ERMS and ARMS.
  • To determine the outcomes for adult patients diagnosed with ERMS and ARMS.
  • To identify prognostic factors influencing survival in adult ERMS and ARMS.

Main Methods:

  • Analysis of a prospectively maintained database of adult patients (18 years or older) diagnosed with ERMS or ARMS between 1990 and 2016.
  • Inclusion of 66 adult patients (42 men, 24 women) with a median age of 28 years.
  • Univariate analysis to identify prognostic factors.

Main Results:

  • The median overall survival for adult ERMS and ARMS patients was 18 months, with a 5-year overall survival rate of 27%.
  • Patients with metastatic disease had a significantly lower 5-year overall survival rate (11%) compared to those with localized disease (36%).
  • Negative prognostic factors identified include alveolar subtype, fusion gene positivity, infiltrative tumor, and metastatic presentation.

Conclusions:

  • Survival for adult ERMS and ARMS patients is poor, underscoring the need for targeted therapeutic strategies.
  • The findings can inform the design of clinical trials investigating novel agents for adult rhabdomyosarcoma.
  • Collaborative efforts between pediatric and adult oncologists are crucial for advancing research into the biological, genetic, and clinical aspects of these rare sarcomas.