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Articles by W. S Song
Total Records ( 2 ) for W. S Song
  J. A Lee , M. S Kim , J. S Koh , D. H Kim , J. S Lim , C. B Kong , W. S Song , W. H Cho , S. Y Lee and D. G. Jeon
  Objective

We aimed to understand the biology of osteosarcoma of the flat bone, which is a rare tumor entity.

Methods

Cases with osteosarcoma of the flat bone were compared with those of the extremity in order to evaluate their clinicopathologic characteristics. And the influences of heterogeneous treatment modalities on outcome were analyzed.

Results

Tumors of the flat bone comprised 91 (11.3%) of 806 osteosarcoma cases. Eight cases were secondary osteosarcoma associated with previous radiotherapy. Patients with a flat bone tumor were significantly older and more likely to present with metastases at diagnosis than extremity tumor. The proportions of female sex and chondroblastic subtype were higher among flat bone tumors than among extremity tumors. The 5-year overall survival and event-free survival rates were 35.2 ± 5.4% and 24.7 ± 5.5%, respectively. Although age and histologic response to pre-operative chemotherapy were not related to outcome of flat bone tumors, treatment modality influenced the survival. Patients treated surgically had better outcomes than those treated by another means. Radiation therapy did not appear to be an effective local control measure as surgery.

Conclusions

Treatment outcome of the tumor of the flat bone was worse than extremity tumors. Further studies are needed to identify effective local control measures that can substitute for surgery and to determine the biologic characteristics of osteosarcoma of the flat bone.

  J. A Lee , D. H Kim , J. S Lim , J. S Koh , M. S Kim , C. B Kong , W. S Song , W. H Cho , S. Y Lee and D. G. Jeon
  Objective

Due to the low incidence, treatments for Korean soft tissue Ewing sarcoma patients have been heterogeneous, and reported data are limited. In this study, we retrospectively analyzed soft tissue Ewing cases treated at our institution.

Methods

We analyzed the clinicopathologic characteristics and treatment outcome of soft tissue Ewing sarcoma patients and compared with those of skeletal cases.

Results

Twenty-seven soft tissue Ewing sarcoma cases were evaluated. Patients with soft tissue Ewing sarcoma were older than patients with skeletal tumors (P = 0.03), and tended to have metastasis at diagnosis (P = 0.12). However, sex ratios, pathologies, tumor volumes, and histologic response to preoperative chemotherapy were not different in the two groups. The 5-year overall survival (49.0%) and event-free survival (45.6%) of soft tissue Ewing sarcoma patients were similar to those of skeletal tumor patients (51.8% and 46.0%, respectively). Presence of metastasis at diagnosis and poor histologic response to preoperative chemotherapy were associated with an adverse outcome for both groups. Similar to skeletal tumors, central tumor location, pathology and tumor volume tended to be related to the survival of soft tissue Ewing sarcoma. However, age and the use of a modality other than surgery to achieve local control did not influence the survival of soft tissue Ewing sarcoma patients.

Conclusions

Our data could provide a basis to design a collaborative or multinational study targeting Ewing sarcoma family tumors.

 
 
 
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