Recurrence Pattern of Pathologic Stage I Lung Adenocarcinoma With Visceral Pleural Invasion.

BACKGROUND: Visceral pleural invasion (VPI) is well known to be a poor prognostic factor in lung adenocarcinoma. There were few studies reporting postoperative recurrence pattern in lung adenocarcinoma with VPI. This study was to evaluate the clinical effect of VPI on recurrence pattern in pathologic stage I lung adenocarcinoma after curative resection.

METHODS: Among 574 patients with pathologic stage I lung adenocarcinoma after complete resection between 2003 and 2012, the clinicopathologic characteristics of 89 patients (16%) who had recurrence were retrospectively reviewed. The pathologic findings, postrecurrence survival, and patterns of recurrence were compared between patients with VPI and without VPI.

RESULTS: Median follow-up duration was 53.6 months. The VPI was found in 43 patients (group I) and not found in 46 patients (group II). Both total tumor size and invasive size were larger in group I (3.2 versus 2.7 cm and 2.5 versus 2.1 cm; p < 0.05). The median duration of overall survival was 58 months in group I and 76 months in group II. As patterns of recurrence, pleural seeding was found in 25 patients, and the percentage of pleural seeding was significantly higher in group I than group II (44.2% versus 13.0%; p = 0.001). In group I, bilateral lung metastasis was significantly common (39.5% versus 13.0%; p = 0.004), and increasing percentage of pleural seeding was observed as the invasive tumor size grows.

CONCLUSIONS: The presence of VPI was a significant predictable factor for pleural seeding and bilateral lung metastasis as patterns of recurrence after complete resection in pathologic stage I lung adenocarcinoma.