In contrast, PUVA therapy using identical treatment conditions (2.5 and 5 μM 8MOP) had relatively less effect on the growth and viability of MCF7 cells, a ErbB2 non-overexpressing human breast cancer cell line and a non-malignant human foreskin fibroblast cell line (HFF) (Figure 1C and D). This evidence concerns the gene ERBB2 and breast carcinoma.