[Scintigraphy with 99mTc-MIBI for assessment of tumor response to preoperative chemotherapy in patients with osteosarcoma].

In osteogenic sarcoma an increase in patient survival has been observed due to improvement of diagnostic and treatment methods. The objective of the investigation was to determine the usefulness of scintigraphy with 99mTc-MIBI in comparison to clinical revaluation, in order to assess tumor response (sarcoma) to chemotherapy previous to surgery. Patients with histopathological osteogenic sarcoma that received chemotherapy were included, clinical and scintigraphy response was assessed previous to the surgery. The gold standard for comparison was the degree necrosis histopathological analysis of the surgical specimen with measurement. Twelve patients met the inclusion criteria. A was observed a higher correlation between the 99mTc-MIBI and the histopathology. vs. clinical evaluation (0.89 vs. 0.59 respectively). Likewise the sensitivity (Se) and specificity (Sp) were superior (Se and Sp = 100% vs. Se 66.6% and Sp 75%) when therapeutically responses good and null were compared. We may conclude that scintigraphy with 99mTc-MIBI used to asses the response to presurgery chemotherapy in patients with osteogenic sarcoma, together with the clinical assessment, help the physician to make therapeutically decisions with more objectivity and certainly.