TF and Iron deficiency anemia: In the succession of events that leads to iron deficiency anaemia, ferritin diminution appears early, immediately after the waning of the iron stores in the bone marrow, and before occurrence of all the other changes in iron deficiency anaemia: decrease in transferrin saturation, serum iron, red cell volume and haemoglobin [9], and this allows us to hope that ferritin would have a higher sensitivity for the diagnosis of gastrointestinal cancer.