Table 2

Sensitivity of rare event detectiona

Cells added per 106 PBMCsTotal no. of cells detectedTotal cell countCells detected per 106 PBMCs
100017891.94 × 106922
1001691.79 × 10695
10272.35 × 10612
5385.16 × 1067
2113.94 × 1063
1136.13 × 1062
  • a MCF-7 cells were serially diluted in PBMC and labeled for cytokeratin on adhesion slides. Two to eight slides for each dilution were analyzed for CK+ cells and total number of cells. Observed cell counts (last column) do not differ statistically from the expected count (first column) (χ2 test).