Abstract
The serum muramidase levels were measured in 128 patients with primary or metastatic colorectal cancer, 166 tumour-free patients after resection of a colorectal cancer, and 172 controls. Muramidase levels over 10 μg/ml were detected in 30%-39% of the tumour-bearing patients, in 8·2% of the tumour free, and in only 1·7% of the controls (normal level 6·68 ± 1·42 μg/ml). Long-term follow up indicated that raised levels may occur as a transient phenomenon in recurrent or metastatic disease. The likely relation of abnormal serum muramidase activity and stimulation of the reticuloendothelial system is discussed.
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