There is provided a method for identifying pre-malignancy, malignancy, and degree of pre-malignancy and malignancy of a cell by detecting extrachromosomal and intrachromosomal gene amplification. Also provided is a marker for the identification of pre-malignancy, malignancy, and degree of pre-malignancy and malignancy of a cell containing extrachromosomal and intrachromosomal gene amplification of a gene. A diagnostic tool for the diagnosis and prognosis or cervical cancer containing extrachromosomal and intrachromosomal gene amplification of a gene.