Molecular detection of cancer cells in bone marrow and peripheral blood ofpatients with operable breast cancer. Comparison of CK19, MUC1 and CEA using RT-PCR

We have compared three different RT-PCR procedures to measure cytokeratin 1 9 (CK19), carcinoembryonic antigen (CEA) and mucin MUC1 gene expression in order to determine their diagnostic value in detecting tumour cells in bone marrow aspirates of patients with operable breast cancer. In an experiment al model, the best sensitivity was observed for CK19 and MUC1 RT-PCR assays , although only the CEA and CK19 assays showed good specificity. The study of 42 patients showed that a 'CK19 positive/ CEA positive' RT-PCR assay in bone marrow correlated positively with a positive axillary lymph node statu s (N-0 versus N1-3, P < 0.05). Both assays were also positive in 17% of nod e negative patients. RT-PCR assays were more sensitive in bone marrow than in peripheral blood. Our results suggest that CK19 and CEA RT-PCR assays ar e powerful methods for detecting disseminated breast cancer cells. A larger study with long-term follow-up is required in order to clarify their clini cal usefullness. (C) 2000 Elsevier Science Ltd. All rights reserved.