- High levels of cytokeratin 19 fragments but no evidence of cytokeratins 1, 2, 10/11, 14 or filaggrin in the serum of squamous cell lung carcinoma patients. Miédougé, M., Devys, A., Simon, M., Rouzaud, P., Salama, G., Reyre, J., Pujazon, M., Carles, P., Serre, G. Tumour Biol. (2001)