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Whole body planar images of a trastuzumab naive patient with HER2+ metastatic breast cancer 4 hours following 5mCi IV injection of 111In trastuzumab. The solid arrows demonstrate uptake in patients known bony metastases. Intense uptake in the liver is physiologic (primary route of excretion). The hollow arrow indicates the location of 5 microCi source external to the patients, placed for calibration.
