SEOM clinical guidelines for the management of adult soft tissue sarcomas.

Soft tissue sarcomas are uncommon tumors of mesenchimal cell origin. Criteria for suspicion is a soft tissue mass that is increasing in size, and has a size greater than 5 cm or is located under the deep fascia. Diagnosis and management of these patients should preferably be performed by a specialist multidisciplinary team in a referral center. Assessment of a patient with a suspect of sarcoma should include magnetic resonance and biopsy performed prior to surgery. Primary local therapy for patients with localized sarcoma is based on wide surgical resection with a tumor-free tissue margin, in association in most cases with radiotherapy. Adjuvant chemotherapy constitutes an option that could be considered in high-risk sarcomas of the extremities. When metastasis are present, surgery of pulmonary lesions, in some selected patients, and chemotherapy are current available options.