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Assessment of KRAS mutation status from CTC in a patient with metastatic colorectal cancer. CTC positivity: CTC+, dg: diagnosis, G: grade, RAS: group of oncogenes, wt: wild type, CNS: central nervous system, FOLFOX/FOLFIRI: chemotherapy regimens (see main text), KRT18/19 (keratins), TTF1 (Thyroid transcription factor 1), genes of chemoresistance: see Table 2.
