The VIF of the variables in the model was calculated and the results were all below 2 (albumin: 1.166, APSIII: 1.705, chemotherapy: 1.107, chloride: 1.080, hepatic metastases: 1.084, lactate: 1.129, respiratory failure: 1.079, SAPSII: 1.733, total protein: 1.181), showing no multicollinearity. This evidence concerns the gene ALB and respiratory failure.