Figure 3.

Mycoplasma polymerase chain reaction, ploidy status, and secretion profile of tumor cells. A: Displayed are the results for 16S-rRNA-gene-based polymerase chain reaction for mycoplasma. All three lines were found free of contaminating mycoplasma. Samples amplified in the absence of tumor DNA served as a negative control, whereas a highly contaminated cell line was applied as a positive control, run in duplicates; B: Cytokine secretion pattern as determined by enzyme-linked immunosorbent assays. Cytokine concentrations were determined by comparison with a standard curve generated from serial dilutions of individual standards. Quantitative analysis of carcinoembryonic antigen (CEA), carbohydrate antigen 19-9 (CA19-9), and interleukin (IL) 8 secretion after three and five days of culture, respectively. Results show the mean ± SD of three independent experiments.