VEGFA and osteosarcoma: In Kaya et al., (2000) study, positive cases (membrane staining and cytoplasmic staining) was over 30%, and there was a significant relationship between VEGF expression and poor outcome of osteosarcoma, which is almost consistent with our results in terms of the VEGF-positive cases, but it is not comparable in terms of prognosis due to the lack of patients’ medical records.