Pulmonary embolism in cancer patients. 
Pulmonary embolism (PE) is rare in the Indian population and is under-reported in patients with malignancy.  We studied the clinical profile and outcome of patients with PE and cancer in the Indian population.  Data of cancer patients with PE, admitted in a tertiary cancer centre, was analyzed.  The prevalence of PE was calculated as the number of patients with PE per 10,000 hospital admissions.  The demographic data, details of cancer, co-morbidities, details of PE, and treatment given for PE and their outcomes were recorded and analyzed.  There were 56,425 hospital admissions in the study period.  The prevalence of PE was 6.4 per 10,000 hospital admissions .Thirty-six cancer patients were diagnosed to have PE.  In females, gynecological malignancies (36.84%) and in males gastrointestinal, head and neck cancers, and hematological malignancies were the most common sites (17.7% each).  PE was associated with DVT in 41.7%.  Dyspnea was the most common presenting symptom.  Five patients (13.88%) were asymptomatic and were incidentally detected to have PE .  The most common echocardiographic finding was right ventricular dysfunction (55.55%).  Mortality among the treated patients was 22% (7 / 31) and in untreated patients it was 80% (4 / 5).  The factors that had an impact on a three-month survival were, the presence of massive PE (P = 0.019) and the presence of RV dysfunction at presentation (P = 0.005).  The prevalence of PE and mortality due to PE is high in cancer patients.  Risk stratification for venous thromboembolism (VTE) should be done in all cancer patients and thromboprophylaxis should be optimally used.