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We retrospectively evaluated the relationship between the response of lung lesions and distant progression-free survival (DPFS) after radiosurgery in patients with brain metastases. A total of 47 consecutive patients were treated with radiosurgery for brain metastases. Distant progression was defined as a new enhancing intracranial tumor or leptomeningeal enhancement noted on follow-up magnetic resonance imaging. Progression of lung lesions was defined as follows: (1) a 20% increase in the summed diameter of the target lesions; (2) an absolute increase of 5 mm when the summed diameter was very small; or (3) detection of new lesions in the lung. Distant progression after radiosurgery was observed for twenty-one (44.7%) patients; we observed development of new distant metastases in nine patients, development of leptomeningeal seeding in eight patients, and combined failure of distant progression and local control failure in four patients. Forty-two (89.4%) patients had lung lesions at the time of radiosurgery, and progression of their lung lesions during the post-radiosurgery follow-up period was observed for 18 (38.3%) of these. The median DPFS was 7.00 months (95% CI, 6.153-7.847). Actuarial DPFS 3, 6, and 12 months after radiosurgery was 81.5, 61.3, and 36.7%, respectively. In multivariate analysis, only the criterion progression of lung lesions reached statistical and independent significance (P = 0.021, OR = 3.372, 95% CI, 1.200-9.480). The response of lung lesions after radiosurgery is likely to be a good predictor of DPFS after radiosurgery in patients with brain metastases.
Gamma Knife Center, Department of Neurosurgery, Seoul National University Bundang Hospital, Gyeonggi-do, Korea.
This article was published in the following journal.
Name: Journal of neuro-oncology
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Neoplasms of the intracranial components of the central nervous system, including the cerebral hemispheres, basal ganglia, hypothalamus, thalamus, brain stem, and cerebellum. Brain neoplasms are subdivided into primary (originating from brain tissue) and secondary (i.e., metastatic) forms. Primary neoplasms are subdivided into benign and malignant forms. In general, brain tumors may also be classified by age of onset, histologic type, or presenting location in the brain.
Tumors or cancer of the LUNG.
Malignant neoplasm arising from the epithelium of the BRONCHI. It represents a large group of epithelial lung malignancies which can be divided into two clinical groups: SMALL CELL LUNG CANCER and NON-SMALL-CELL LUNG CARCINOMA.
A basic helix-loop-helix leucine zipper (bHLHZ) transcription factor and proto-oncogene protein that functions in cell growth and proliferation. In mammals, it is highly expressed in the brain during embryogenesis and is essential for brain development; it is not expressed in adult tissues. Amplification or overexpression of N-Myc occurs in at least 20% of tumors and is associated with a poor prognosis in cases of NEUROBLASTOMA; ALVEOLAR RHABDOMYOSARCOMA; SMALL CELL LUNG CARCINOMA; and neuroendocrine prostate cancer.
Component of the NATIONAL INSTITUTES OF HEALTH. Through basic and clinical biomedical research and training, it conducts and supports research with the objective of cancer prevention, early stage identification and elimination. This Institute was established in 1937.
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