Palliative surgical outcome score (PSOS) in patients treated palliatively with self-expanding metal stent (SEMS) for malignant incurable colorectal obstruction

Abstract

AimThe palliative surgical outcome score (PSOS) was proposed for evaluation of the effect of palliative surgical interventions. As a surrogate measure for successful symptom control, it is defined as the proportion of days outside the hospital of the remaining life time up to six months after a palliative intervention. In this study we evaluate the PSOS in patients treated palliatively with self-expanding metal stents (SEMSs) for incurable malignant colorectal obstruction. MethodsAll eligible patients endoscopically treated with palliative intent with SEMSs were identified. Demographics and clinical characteristics, including complete follow-up, were recorded, and the PSOS was calculated. Non-parametric tests were used for comparisons, and survival was evaluated by univariable and multivariable analyses. ResultsBetween 2005 and 2013, 116 patients (median age 71.5 years; 53.4% women) were identified. Most obstructions were caused by primary colorectal cancers. Technical- and clinical success rates were 94.0% and 87.1%, respectively. Procedure-related complications occurred in 17 (14.7%) of the patients, and most were minor. A PSOS>70 (regarded as excellent palliation) was achieved in 79 (68.1%) patients. This goal was significantly more often achieved in patients who survived at least 6 months than in those with shorter survival (p < 0.001). No clinical variables at the time of the endoscopic palliative procedure could predict a PSOS>70. However, in patients who survived at least 6 months (n = 69), a PSOS>70 was independently associated with better survival in the multivariable Cox analysis. ConclusionsPSOS could be used as a practical proxy or a pragmatic tool for the effectiveness of palliative interventions, when such interventions are compared. Clinical factors that could significantly add to the clinical decision-making and predict a PSOS>70 in an individual patient were not identified for this specific group of patients.