MALIGNANT PLEURAL effusion (MPE) is defined as the presence of malignant cells in the pleural fluid and when present is a sign of an advanced stage of either a thoracic or extrathoracic malignancy. MPE is suspected in patients with a history of advanced malignant disease who present with a recurrent pleural effusion that contains an elevated protein concentration with lymphocyte predominance. 1 MPE is a common complication, with an estimated incidence of >150,000 cases per year, with most arising from lung and breast cancer metastases, lymphoma, and gastrointestinal tumors, although MPE has been documented with most malignancies. 2 Once diagnosed, the median survival ranges from 4 to 7 months, depending on the type of malignancy, tumor characteristics, the extent of disease, comorbidities, and the composition of the MPE. 3 It is a very disabling condition, with a huge impact on quality of life. 1 Once diagnosed, the management goals for these patients include palliation and improving the patient's remaining quality of life. The challenge is predicting the individual's remaining life span. Studies using quality of life measures, such as the Karnofsky performance scale, have found that patients with low scores of <30 had a median survival of 1.1 months, whereas those with higher scores (>70) tended to have a longer median survival of 13.2 months. 3 Clive et al., using a simplified version of the Karnofsky scale known as the Eastern Cooperative Oncology Group (ECOG) scale, compared the use of this scale alone with the scale in conjunction with laboratory findings and tumor type and developed a score called the LENT score. 4 The components of the LENT score include lactate dehydrogenase levels in the pleural effusion, ECOG scale, the neutrophilto-lymphocyte ratio, and the tumor type. Those authors demonstrated that the LENT score was able to risk stratify patients into a low-risk group, with a median survival of 319 days; a moderate-risk group, with a mean survival of 130 days; and a high-risk group, with a mean survival of 44 days. The score also was found to be superior to the ECOG alone in predicting survival at 1, 3, and 6 months. 4