Introduction: Liposarcoma, mainly involving the deep soft tissue of limbs and torso, especially lower limbs and retroperitoneum, is the second most common malignant tumour derived from primitive mesenchymal topped by malignant fibrous histiocytoma, accounting for 20% of soft tissue Liposarcoma is divided into five histologic subtypes and three biological types based on WHO classification criteria in 2002: 1) well-differentiated liposarcoma (WDLPS) and dedifferentiated liposarcoma (DDLPS); 2) myxoid liposarcoma (MLS) and round cell liposarcoma (RCLS); 3) pleomorphic liposarcoma (PLS). Among them, MLS is biologically characteristic; especially some patients with extrapulmonary metastases come out with poor prognosis. We hereby retrospectively analyse two MLS cases characterized as extrapulmonary metastases treated in our hospital from June 2007 to October 2015and reviewed related literatures as follows.
Methods: We have retrospectively analysed two cases of MLS with distant extrapulmonary metastases and reviewed related literatures.
Result: MLS is relatively sensitive to radiotherapy and chemotherapy, but the therapeutic outcome does not correlate with radiochemotherapy, the more the round cells and the malignant the myxoid liposarcoma. About 1/3 MLS patients have distant metastasis, with predilection to soft tissue and bone of other parts of body, while the bone scanning is usually negative.
Conclusion: As one subtype of liposarcoma, MLS has many specific biological characteristics, like distant metastasis, and currently regular follow-up examination is needed for timely diagnosis and treatment, but individualized treatment may be the future research direction.
Cheng Liu, Jing Chen, Fan Xiong, Weihao Jiang, Qiu Cui, Jun Guo, Yanjun Zeng
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