Factors Associated With Prolonged Survival in Colorectal Cancer Patients Admitted to Palliative Care: An Exploratory Study.

Objective: A recently published study concerning variables associated with survival longer than one year in palliative care included several types of cancer. A secondary analysis limited to patients with colorectal cancer was performed to analyze a more homogeneous group of patients.

Methods: Patients were identified through electronic records from 2012 to December 2018. All patients were over 18 years old and deceased. Cases were defined as patients who survived ≥1 year after being admitted to the palliative care service (PCS), while controls were those who had survived ≤6 months.

Results: The study includes 33 patients as cases and 119 as controls. 82 (54%) were male, and the median age was 78.5 years (49 to 95). In the univariable analysis, the variables associated with a low probability of living ≥1 year were an ECOG performance status ≥2, liver metastases, and pain. The variables associated with a survival ≥1 year were the neutrophil count ≤5.66 x 10⁹/L and a neutrophil/lymphocyte ratio ≤3.59. In the multivariable analysis, only pain and liver metastases were associated with a low probability, and the neutrophil/lymphocyte ratio ≤3.59 with a high likelihood of living one year or more.

Conclusion: The data of this study suggests that in colorectal cancer patients admitted to a PCS, the presence of pain, liver metastases, and a high neutrophil/lymphocyte ratio negatively impact the probability of living ≥1 year.