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A Journal on Nuclear Medicine and Molecular Imaging
Affiliated to the and to the International Research Group of Immunoscintigraphy
Indexed/Abstracted in: Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index (SciSearch), Scopus
Impact Factor 2,413
Alessandro STEFANO 1, 2, Giorgio RUSSO 1, Massimo IPPOLITO 3, Sebastiano COSENTINO 3, Gabriella MURÈ 3, Sara BALDARI 3, Maria G. SABINI 4, Daniele SARDINA 4, Lucia M. VALASTRO 4, Roberto BORDONARO 5, Cristina MESSA 1, 6, Maria C. GILARDI 1, 6, Hector SOTO PARRA 7
1 IBFM CNR-LATO, Cefalù, Palermo, Italy; 2 Department of Chemical, Management, Informatics and Mechanical Engineering, University of Palermo, Palermo, Italy; 3 Nuclear Medicine Department, Cannizzaro Hospital, Catania, Italy; 4 Medical Physics Unit, Cannizzaro Hospital, Catania, Italy; 5 Medical Oncology Unit, Oncology Department Garibaldi-Nesima Hospital, Catania, Italy; 6 University of Milan-Bicocca, Milan, Italy; 7 Medical Oncology Unit, Oncology Department Policlinico Universitario Hospital, Catania, Italy
BACKGROUND: In this paper the clinical value of PET for early prediction of tumor response to erlotinib in patients with advanced or metastatic non-small cell lung cancer (NSCLC) after failure of at least one prior chemotherapy regimen is evaluated. The aim was to compare the early metabolic treatment response using European Organization for Research and Treatment of Cancer (EORTC) 1999 recommendations and PET Response Criteria in Solid Tumors (PERCIST), and the standard treatment response using Response Evaluation Criteria in Solid Tumors (RECIST).
METHODS: Twenty patients with stage IV NSCLC were enrolled prospectively. PET/CT studies were performed before, then 48 hours, and 45 days after the initiation of erlotinib treatment. The lesion with the highest uptake in each patient was evaluated according to EORTC 1999 recommendations, PERCIST and RECIST to assess metabolic and anatomic response. Response classifications were compared statistically using Wilcoxon signed-rank test. Disease-free survival (DFS) and overall survival (OS) were calculated by the Kaplan-Meier Test.
RESULTS: At 48 hours, the Kaplan-Meier analysis showed that EORTC proved to be a significant prognostic factor for predicting DFS and OS. At 45 days, there was a significant difference in response evaluation between RECIST and metabolic classifications. RECIST and PERCIST were significant prognostic factors for predicting DFS and OS. EORTC was not able to discriminate responder from non-responder patients.
CONCLUSIONS: This study shows that, according to the EORTC protocol, the PET exam is able to provide early identification of patients who benefit from Erlotinib treatment. Used at the end of therapy, PERCIST could be considered an appropriate metabolic evaluation method to discriminate responders from non-responders.