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Concurrent chemo-radiotherapy for unresectable non-small cell lung cancer invading adjacent great vessels on radiologic findings: is it safe?

We performed a retrospective analysis to evaluate treatment outcomes and the risk of fatal hemorrhage by tumor regression when definitive concurrent chemo-radiotherapy (CCRT) was delivered to patients with non-small cell lung cancer (NSCLC) invading adjacent great vessels on radiological findings. We selected 37 unresectable NSCLC patients with adjacent great vessel invasion (GVI) by carefully reviewing each patient's images. The criteria of definite GVI were as follows: irregular indentation at the tumor-vessel contact border, slit-like narrowing of adjacent great vessels by the tumor, presence of intra-luminal mass formation, tumors contacting >5 cm of adjacent great vessel and obliteration of the intervening fat plane between tumor and adjacent great vessel, and/or tumors contacting more than half of the circumference of the aortic wall. All of the patients completed the CCRT, of which the median dose was 66.0 Gy (range, 59.4-72.0 Gy) with 1.8 or 2.0 Gy per fraction. The 2-year overall survival (OS) rate for total patients was 48.2%. Early nodal staging (P = 0.006) and good performance status (P = 0.044) were identified as independent prognostic factors associated with better OS. There was no fatal complication related to the GVI, such as a sudden death or massive hemoptysis due to vascular rupture after CCRT. We concluded that definitive CCRT for NSCLC patients with GVI on radiological findings has a low risk of fatal complication and it can benefit long-term survival when treated with CCRT in patients with early nodal staging or good performance status.

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