Abstract
There is some disagreement in the literature about the tumour affinity and tumour specificity of gallium-67 (<sup>67</sup>Ga). The present investigation showed good uptake of <sup>67</sup>Ga in most cases of bronchial carcinoma, but some uptake of <sup>67</sup>Ga was also found in 30% of those with non-malignant lung lesions. There was no relationship between the uptake of <sup>67</sup>Ga and the histological type of bronchial carcinoma. After radiotherapy, a transient uptake of <sup>67</sup>Ga in the irradiated field was seen. In five patients who were studied again two months after the end of radiation treatment, uptake of <sup>67</sup>Ga was no longer demonstrable at the original site of the tumour. <sup>67</sup>Ga appears to be an isotope with a high affinity for bronchial carcinoma but it is not tumour specific. However, our experience indicates that a negative <sup>67</sup>Ga scintigram of the lung in a case of suspected malignancy calls for reconsideration of the clinical diagnosis.
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