In order to analyze the c-Fos and c-Jun expression in different cervical cancer cells, we measured the level basal of c-Fos and c-Jun protein expression in C-33A, SiHa, HeLa cells, corresponding to HPV-, HPV16 and HPV18 infection respectively, and HaCaT non-tumoral cervical cancer cells were used as control. The gene discussed is FOS; the disease is cervical cancer.