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Open Access Research

FDG uptake correlates with recurrence and survival after treatment of unresectable stage III non-small cell lung cancer with high-dose proton therapy and chemotherapy

Zuo-Lin Xiang1, Jeremy Erasmus2, Ritsuko Komaki1, James D Cox1 and Joe Y Chang1*

Author Affiliations

1 Departments of Radiation Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX, 77030, USA

2 Departments of Diagnostic Radiology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA

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Radiation Oncology 2012, 7:144  doi:10.1186/1748-717X-7-144

Published: 28 August 2012

Abstract

Background

We studied whether maximum standardized uptake values (SUV) from [18 F] PET/CT predict clinical outcome after concurrent proton/chemotherapy for stage III non-small cell lung cancer (NSCLC).

Methods

Eighty-four patients were treated prospectively with 74 Gy(RBE) proton therapy and concurrent chemotherapy. PET/CT scans were available before (SUV1) and within 6 months after (SUV2) treatment. The predictive value of clinical and PET/CT factors were analyzed with univariate and multivariate Cox regression models.

Results

Median survival time was 29.9 months. At 3 years, the local recurrence-free survival (LRFS) rate was 34.8%; distant metastasis-free survival (DMFS), 35.4%; progression-free survival (PFS), 31.2%; and overall survival (OS), 37.2%. Patients with SUV2 ≥3.6 (the median) had high rates of LR (p = 0.021). Of 12 clinicopathologic features evaluated in univariate analysis, only KPS, SUV1, and SUV2 predicted LRFS, DMFS, PFS, and OS (p <0.05). Multivariate analysis showed that KPS (p = 0.025) and SUV2 (p = 0.017) were independently prognostic for LRFS and that SUV1, SUV2, and KPS were independently prognostic for DMFS, PFS, and OS (p <0.05).

Conclusions

SUV2 predicted LRFS, and SUV1 and SUV2 predicted DMFS, PFS, and OS, in patients with stage III NSCLC treated with concurrent chemotherapy and high-dose proton therapy.

Keywords:
Proton therapy; Chemotherapy; Non-small cell lung cancer; PET/CT imaging; Standardized uptake value; Prognostic factors