... K,Akiyoshi T: Clinical significance of molecular detection of carcinoma cells in lymph nodes and peripheral blood by reverse transcription-polymerase chain reaction in patients with gastrointestinal or ... K, Reingruber B, Horbach T,Baumann I, Kirchner T, Hohenberger W, Papadopoulos T: Transcription of cytokeratins 8, 18, and 19 in bone marrow and limited expression of cytokeratins 7 and 20 by carcinoma ... (Tiangen, Beijing, China) fol-lowing the protocol provided by the manufact urer. RNAintegrity was checked by electrophoresis and quantified by absorption at 260 and 280 nm using a UV-visiblespectrophotometer...