BACKGROUND.
Endometrial cancer is the most common female genital cancer and approximately 90% of the cases are diagnosed while they are still confined to the uterus. However, the natural history and treated course after the development of pulmonary metastasis (PM) have not been studied systematically in a large series of patients. Between 1962 and 1992, 100 patients (6%) with PM were identified by computerized search of the medical records from 1.665 patients admitted to our hospitals with the diagnosis of uterine cancer. The median age of the patients was 65.5 years (range: 42-87 yrs). The usual histologic types of the uterine neoplasms were 59 adenocarcinomas (59%), 21 sarcomas, and 14 adenosquamous carcinomas. Of the 83 patients with reported tumor grade, 11 had Grade 1 tumor, 12 Grade 11, and 60 Grade 111.
METHODS.
RESULTS.
Lung metastases were found at the time of diagnosis of the primary tumor in 22 patients. Hemoptysis was the first symptom in 3 of the 22; the majority had no respiratory symptoms. In the remaining 78 patients with PM appearing after primary therapy, the mean interval time between primary diagnosis and PM was 29.4 months, whereas between PM and death was 15.7 months. Of all patients with lung metastases, 75% did not survive 1 year; however 6% survived more than 5 years after diagnosis of metastatic disease. Patients with isolated PM had prolonged survival (36.1 mos, P = 0.001), whether treated medically or with pulmonary resection. Progestin therapy was given to 39 patients, with complete response consisting of radiographic resolution of all disease in 6 patients (15%) and prolonged stabilization in an additional 5 (13%). The histologic grade of the primary tumor was predictive of clinical response to progestine therapy. CONCLUSIONS. Asymptomatic pulmonary metastases represent a common site of extra pelvic spread of disease. The majority of patients with PM (75%) do not survive 1 year. Low grade uterine tumors are more likely to respond to progestin therapy and do so for extended periods of time. Cancer 1996; 78441-7.