The present invention concerns methods of identifying a cancer patient suitable for a treatment, for the treatment of cancer in a patient, for the prognosis of cancer outcome, or of diagnosing a cancer in a patient by determining with a biological assay an oncogenic potential of a sensitized cell contacted with a biological fluid derived from the patient, compared to a reference value, and if the oncogenic potential of the sensitized cell is above or below a reference value, a suitable identification, diagnosis or treatment may be performed.