Figure 1: Papanicolaou-stained cells by LBC Non-cancer cells: NHDF (a), COS-7 (b); cancer cells: LS-180 (c), MCF-7 (d), A549 (e), Kato-III (f). The color of the nucleus of each cell, the intensity of purple was stronger in cancer cells than in non-cancer-derived cells. Regarding the color tone to distinguish non-cancer and cancer cells, it is difficult to express the cytological findings with purplish-red and bluish-purple tones, other than purple. Non-cancer-derived and cancer cells were similar with regard to many of the points in the above cellular findings.