Inclusion Criteria:

- Histological examination showed of metastatic colon carcinoma.

- Patients more than 18 years.

- Measurable disease according to RECIST 1.1 criteriso

- Life expectancymore than 3 months according to the criteria of the investigator.

- Goodoverall condition determined by the ECOG scale (score 0-1)

- Candidate for systemic treatment based on the profile of sensibility to drugs
determined by genetic analysis of the tumor sample. Patients should have received at
least two lines of standard treatment, including therapies antiEGFR in cases of
tumors with Kras oncogene B-Raf and native (non-mutated).

- Availability of tumor tissue or potential for tumor biopsy correlation allowing the
RNA expression profile with that obtained from the peripheral blood CTCs.

- Adequate hematologic function: ANCmore than 1.5 x 103 / L, platelet count absolute
more than 100 x 109 / L, normal values ​​of INR and PTT.

- Adequate liver function: total serum bilirubin no more than 2 mg / dL, ALT and AST no
more than 3 times the upper limit established by the laboratory (LSR) or no more than
5 LSR in patients with liver metastases.

- Adequate renal function: serum creatinine no more than 1.5 LSR or calculated
creatinine clearance 60 ml / min (Crock).

Exclusion Criteria:

- The patient has received systemic cancer treatment within two weeks prior to
extraction of the blood sample.

- Patient has received therapeutic radioisotopes such as strontium 89 within 4 weeks
before blood extraction.

- Patient has had major surgery or percutaneous procedures such as placement of central
venous catheter within 2 weeks prior to the blood draw.

- Patient has a history as bone marrow transplantation and / or stem cell
transplantation.

- Patient has any of the following concomitant diseases or current conditions:

chronic active liver disease of any origin, and / or cirrhosis with Child-Pugh score B or
C.

Uncontrolled active infection. carries the human immunodeficiency virus (HIV). Any other
significant disease that in the opinion of the investigator, substantially increase the
risk associated with patient participation in this study.

documented symptomatic brain metastases, progression or requiring corticosteroids or
associated to a leptomeningeal involvement.

Patients with uncontrolled systemic diseases. Patients with Hypertension or Diabetes
Mellitus is countable if at the time of inclusion deemed medically controlled.

Patients with inability for oral drug delivery, either by preventing gastrointestinal
administration situation or severe impairment of intestinal absorption

- Any medical or psychiatric condition that, in the opinion of the investigator, may
limit the patient's ability to understand and fulfill all requirements under its
partcipación in the study.

- Pregnant or lactating women