In osteosarcoma, chemotherapy response can be predicted and evaluated by conventional and diffusion-weighted MRI early in the disease course and it correlates well with necrosis. Further, newly derived parameter diffusion per unit volume appears to be a sensitive substitute for response evaluation in osteosarcoma.
Positive VEGF expression in surviving tumor cells post-NACT in resected tumors appears to be an important negative prognostic factor in osteosarcoma which may help future therapies to be identified according to the angiogenic potential of the disease.
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