Objective To evaluate the value of 99mTc-Octreotide somatostatin receptor and 99mTc-MIBI imaging in the detection of breast cancer. Methods 99mTc-Octreotide and 99mTc-MIBI imaging were performed in 26 patients with breast masses before operation. The scintigraphy results were analysed compared with pathologic study.Results The sensitivity, specificity and accuracy of 99mTc-Octreotide scintigraphy for breast cancer were 94.4%, 87.5%and 92.3%respectively and those of 99mTc-MIBI were 88.9%, 75.0%and 84.6%respectively. Significant difference was found between 99mTc-Octreotide and 99mTc-MIBI in both of specificity and accuracy (P