Primary Treatment for Myxoid Liposarcoma

Diagnosis and Staging

The European Society for Medical Oncology recommends preoperative diagnosis through core needle biopsy under imaging guidance, with the biopsy tract planned so it can be removed during definitive surgery 4
The National Comprehensive Cancer Network recommends MRI as the preferred imaging modality for extremity and trunk myxoid liposarcoma, while CT is recommended for other anatomical sites 1, 3
Chest CT scan is mandatory for staging to detect pulmonary metastases, as recommended by the European Society for Medical Oncology 2, 3
Abdominal and pelvic CT scan is specifically recommended for myxoid liposarcoma due to its propensity for extrapulmonary metastases, according to the European Society for Medical Oncology 5, 4
Spine and pelvic MRI is preferred for myxoid liposarcoma due to its tendency to metastasize to these areas, as recommended by the National Comprehensive Cancer Network 1, 6
All diagnostic and treatment decisions should be discussed in a multidisciplinary tumor board, as recommended by the European Society for Medical Oncology 1, 5

Wide excision with negative margins (R0) is the standard surgical approach, removing the tumor with a rim of normal tissue around it, as recommended by the European Society for Medical Oncology 2, 3
The surgery must be performed by a surgeon specifically trained in sarcoma treatment, according to the European Society for Medical Oncology 2, 7
For extremity myxoid liposarcoma, limb-sparing procedures should be attempted whenever possible, as recommended by the National Comprehensive Cancer Network 1, 8
Amputation may be considered in rare cases where adequate margins cannot be achieved with limb-sparing surgery, according to the British Journal of Cancer 8
Plastic surgical reconstruction may be necessary for skin and/or soft tissue defects following wide excision, as recommended by the British Journal of Cancer 8

Radiation therapy is standard treatment following wide excision for high-grade, deep lesions >5 cm, as recommended by the European Society for Medical Oncology 2, 3
Radiation therapy should be administered at a dose of 50-60 Gy with fractions of 1.8-2 Gy, with possible boosts up to 66 Gy, according to the European Society for Medical Oncology 2, 9
Preoperative radiotherapy may be considered for myxoid liposarcoma as it is particularly radiosensitive and may result in tumor downsizing to facilitate easier resection, as recommended by the British Journal of Cancer 8

Inadequate surgical margins significantly increase the risk of local recurrence; re-excision should be considered if initial margins are positive, as recommended by the European Society for Medical Oncology 3, 9
Failure to perform appropriate staging imaging (particularly spine/pelvic MRI) may miss extrapulmonary metastases that are common in myxoid liposarcoma, according to the National Comprehensive Cancer Network 1
Misdiagnosis can occur due to the myxoid appearance; central pathological review by an expert sarcoma pathologist is strongly recommended, as recommended by the European Society for Medical Oncology 1, 5
Patients who undergo inadvertent surgery without a preoperative diagnosis of sarcoma should be fully staged and considered for re-excision of the surgical bed, according to the British Journal of Cancer 8