title: Osteoblastic reaction in non-small cell lung carcinoma and its association to epidermal growth factor receptor tyrosine kinase inhibitors response and prolonged survival.
abstract: BACKGROUND
  The aim of this study was to describe the characteristics and epidermal growth factor receptor (EGFR) mutational status of patients with non-small cell lung cancer (NSCLC) with osteoblastic reactions diagnosed before or during treatment with EGFR tyrosine kinase inhibitors (TKIs).
  
  
  METHODS
  Retrospective study including patients with 36 NSCLC with at least one site of osteoblastic reaction at the time of diagnosis or during treatment with EGFR-TKI.
  
  
  RESULTS
  The rate of patients with mutated EGFR tumors with osteoblastic reactions before or after EGFR-TKI treatment was similar. Median progression-free survival (PFS) for the entire group was more than 9 months and median survival was more than 12 months. There was no statistically significant difference in survival between patients with osteoblastic reactions before initiation of TKI and those diagnosed during TKI treatment. Patients with extraosseous metastases when treated with TKI had the lowest survival (P < 0.0001).
  
  
  CONCLUSIONS
  In patients with NSCLC treated with TKI, initial or development of an osteoblastic reaction seems to be related to a more favorable outcome. In patients with osteoblastic reactions, tumors present with clinical and biologic characteristics of better survival and response to TKI. The occurrence of osteoblastic reactions during treatment with TKI, while primary tumor and metastases are stable or in response, should not be considered as disease progression.
authors.affiliation: Lung Cancer Research Group, Institut National de la Santé et de la Recherche Médicale, La Tronche, France.
authors.forename: Emilie
authors.initials: E
authors.lastname: Pluquet
authors.forename: Jacques
authors.initials: J
authors.lastname: Cadranel
authors.forename: Anne
authors.initials: A
authors.lastname: Legendre
authors.forename: Michelle Beau
authors.initials: MB
authors.lastname: Faller
authors.forename: Pierre Jean
authors.initials: PJ
authors.lastname: Souquet
authors.forename: Gerard
authors.initials: G
authors.lastname: Zalcman
authors.forename: Maurice
authors.initials: M
authors.lastname: Perol
authors.forename: Gislaine
authors.initials: G
authors.lastname: Fraboulet
authors.forename: Gerard
authors.initials: G
authors.lastname: Oliveiro
authors.forename: Florence
authors.initials: F
authors.lastname: De Fraipont
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Quoix
authors.forename: Sylvie
authors.initials: S
authors.lastname: Lantuejoul
authors.forename: Bernard
authors.initials: B
authors.lastname: Milleron
authors.forename: Denis
authors.initials: D
authors.lastname: Moro-Sibilot
mesh_terms: D000230:Adenocarcinoma / Q000188:drug therapy / Q000401:mortality / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000235:genetics / Q000378:metabolism; D018287:Carcinoma, Large Cell / Q000188:drug therapy / Q000401:mortality / Q000473:pathology; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy / Q000401:mortality* / Q000473:pathology*; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy / Q000401:mortality / Q000473:pathology; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000235:genetics; D066246:ErbB Receptors / Q000037:antagonists & inhibitors* / Q000235:genetics; D000069347:Erlotinib Hydrochloride; D005260:Female; D000077156:Gefitinib; D005838:Genotype; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy / Q000401:mortality* / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics; D009367:Neoplasm Staging; D010006:Osteoblasts / Q000187:drug effects* / Q000473:pathology; D016133:Polymerase Chain Reaction; D047428:Protein Kinase Inhibitors / Q000627:therapeutic use*; D011799:Quinazolines / Q000008:administration & dosage; D012189:Retrospective Studies; D015996:Survival Rate; D016896:Treatment Outcome
chemical_list: D014408:Biomarkers, Tumor; D004273:DNA, Neoplasm; D047428:Protein Kinase Inhibitors; D011799:Quinazolines; D000069347:Erlotinib Hydrochloride; C512478:EGFR protein, human; D066246:ErbB Receptors; D000077156:Gefitinib