- Heterogeneous expression of MAGE-A genes in occult disseminated tumor cells: a novel multimarker reverse transcription-polymerase chain reaction for diagnosis of micrometastatic disease. Kufer, P., Zippelius, A., Lutterbüse, R., Mecklenburg, I., Enzmann, T., Montag, A., Weckermann, D., Passlick, B., Prang, N., Reichardt, P., Dugas, M., Köllermann, M.W., Pantel, K., Riethmüller, G. Cancer Res. (2002)