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201Tl/67Ga uptake ratio in small cell carcinoma of the lung: with special reference to serum neuron-specific enolase and prognosis.

201Tl/67Ga crude uptake ratio (CUR) was measured in 12 patients with small cell carcinoma of the lung (SCCL); it was further compared with serum neuron-specific enolase (NSE) and the actual survival times. A significant inverse correlation was observed between CUR and serum NSE (r = 0.610; p less than 0.05); CUR also correlated with actual survival time (r = 0.605; p less than 0.05). Oat cell-type SCCL having a low CUR and highly raised serum NSE, showed a poorer prognosis than the other subtype which has a high CUR whose serum NSE was not raised as much as in oat cell-type SCCL. This preliminary study suggests that 201Tl/67Ga uptake ratio is a possible prognostic indicator of SCCL.