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Download the ESMO 2012 Abstract Book - Oxford Journals

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Annals of Oncology<br />

1271P ANALYSIS OF PFS AND OS FROM THE SATURN STUDY<br />

ACCORDING TO EGFR IHC STATUS USING THE H-SCORE<br />

READING METHOD<br />

J. Mazières 1 , W. Brugger 2 , F. Cappuzzo 3 , P. Middel 4 , A. Frosch 5 , I. Bara 6 ,<br />

G. Klingelschmitt 7 , B. Klughammer 8<br />

1 Thoracic Oncology Unit, Larrey Hospital, Toulouse, FRANCE, 2 Haematology/<br />

Oncology, Schwarzwald-Baar Klinikum, University of Freiburg,<br />

Villingen-Schwenningen, GERMANY, 3 Oncology, Istituto Toscano Tumori,<br />

Livorno, ITALY, 4 Department of Pathology, Targos Advance AG, Kassel,<br />

GERMANY, 5 Department of Pathology, Göttingen University Hospital, Gottingen,<br />

GERMANY, 6 Global Medical Affairs Oncology, F. Hoffmann-La Roche Ltd, Basel,<br />

SWITZERLAND, 7 MDBB Biometrics, F. Hoffmann-La Roche Ltd, Basel,<br />

SWITZERLAND, 8 Department of Biomarkers, F. Hoffmann-La Roche Ltd, Basel,<br />

SWITZERLAND<br />

Background: In <strong>the</strong> phase III SATURN study, maintenance erlotinib significantly<br />

prolonged progression-free survival (PFS) vs placebo in patients (pts) with advanced<br />

non-small-cell lung cancer (NSCLC) and non-progressive disease after first-line<br />

chemo<strong>the</strong>rapy (Cappuzzo et al, Lancet Oncol 2010). Epidermal growth factor<br />

receptor (EGFR) expression analysis by immunohistochemistry (IHC) found no<br />

significant difference in PFS (p = 0.63) or overall survival (OS; p = 0.52) with<br />

erlotinib by EGFR IHC status (Brugger et al, J Clin Oncol 2011). Recently, Pirker at<br />

al. (Lancet Oncol <strong>2012</strong>) presented data on EGFR expression as a predictor of OS for<br />

first-line chemo<strong>the</strong>rapy plus cetuximab in <strong>the</strong> phase III FLEX study, using a novel<br />

method (H-score) to assign EGFR IHC status. We used this method to reassess<br />

samples from <strong>the</strong> SATURN study.<br />

Methods: The H-score method assigns an IHC score to each pt on a continuous<br />

scale of 0–300, based on <strong>the</strong> percentage of cells at different staining intensities<br />

(Pirker et al, Lancet Oncol <strong>2012</strong>). As per this method, <strong>the</strong> outcome-based<br />

discriminatory threshold IHC H-score for our analysis was set at 200 and existing<br />

samples were re-read and classed as low (H-score

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