Samples NC PC Inflow outflow NC         PC 7.9e-14 * *       inflow 1.7e-13 * * 0.8269 *     outflow 0.7887 * 7.3e-11 * * 9.2e-13 * *

Table 2: Comparison of frequency of aberrant cells among controls (NC–negative controls, PC–positive controls) and effluents samples (two by two tables-Fisher΄s Exact Test which gives the p value property between pairs of data.); * p>0.05 samples is not characterized as being statistically significant; * *p<0,00001 samples is characterized as statistically significant.