Prevalence, morphology, and natural history of FGFR1-amplified lung cancer, including squamous cell carcinoma, detected by FISH and SISH.
The aim of this study was to investigate the prevalence of fibroblast growth factor receptor 1 (FGFR1) amplification by fluorescence in situ hybridization (FISH) in a lung cancer patient cohort and to correlate results with morphology, silver in situ hybridization (SISH), and patient outcome. FGFR1 FISH and SISH were performed in 406 and 385 lung cancer cases, respectively, and the results were compared. High-level FGFR1 amplification was defined as the ratio of FGFR1/centromere 8 ≥2, or tumor cell percentage with ≥15 signals ≥10%, or average number of signals/tumor cell nucleus ≥6. Low-level amplification was defined as tumor cell percentage with ≥5 signals ≥50%. Of 406 tumors tested, there were 191 squamous cell carcinomas, 28 carcinomas with focal squamous morphology, 24 large cell carcinomas with squamous immunoprofile, 115 adenocarcinomas, 17 neuroendocrine tumors, and 31 carcinomas without squamous morphology or immunoprofile. FGFR1 FISH was assessable in 368 tumors, with FGFR1 amplification identified in 50, including 48 tumors with either squamous morphology or immunoprofile (48 of 225, 21.3%), and two 'marker-null' tumors without squamous or glandular morphology or immunoprofile (2 of 143, 1.4%; P<0.0001). FGFR1 SISH was assessable in 347 tumors. All 46 FGFR1 FISH-amplified tumors with tumor available for testing showed amplification with SISH, while all other tumors were negative. There was no relationship between FGFR1 amplification status and disease-free (P=0.88, HR=1.04, 95% confidence interval (CI)=0.67-1.60) or overall survival (P=0.97, HR=1.01, 95% CI=0.65-1.58) in surgically radically treated patients with tumors with any squamous morphology or immunoprofile. FGFR1 amplification is a common abnormality in tumors with any squamous morphology or immunoprofile, but it is also present in 'marker-null' tumors. The results of FGFR1 SISH showed 1:1 correlation with the results of FGFR1 FISH, indicating that SISH may be an alternative method to detect FGFR1 amplification. No relationship was detected between patient outcome and FGFR1 amplification.
Department of Anatomical Pathology, St Vincent's Hospital, University of Melbourne, Melbourne, Victoria, Australia.
Prudence A
PA
Russell
Department of Anatomical Pathology, St Vincent's Hospital, University of Melbourne, Melbourne, Victoria, Australia.
Yong
Y
Yu
Research Division, Peter MacCallum Cancer Centre, East Melbourne, Melbourne, Victoria, Australia.
Richard J
RJ
Young
Department of Respiratory and Sleep Medicine, St Vincent's Hospital, University of Melbourne, Melbourne, Victoria, Australia.
Matthew
M
Conron
Department of Surgery, St Vincent's Hospital, University of Melbourne, Melbourne, Victoria, Australia.
Zoe
Z
Wainer
Department of Thoracic Surgery, St Vincent's Hospital, University of Melbourne, Melbourne, Victoria, Australia.
Naveed
N
Alam
1] Research Division, Peter MacCallum Cancer Centre, East Melbourne, Melbourne, Victoria, Australia [2] Division of Hematology and Medical Oncology, Peter MacCallum Cancer Centre, University of Melbourne, Melbourne, Victoria, Australia.
Benjamin
B
Solomon
Department of Thoracic Surgery, St Vincent's Hospital, University of Melbourne, Melbourne, Victoria, Australia.
Gavin M
GM
Wright
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002277:Carcinoma / Q000235:genetics / Q000401:mortality / Q000473:pathology; D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000401:mortality / Q000473:pathology; D005260:Female; D005784:Gene Amplification; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization / Q000379:methods*; D053208:Kaplan-Meier Estimate; D008175:Lung Neoplasms / Q000235:genetics* / Q000401:mortality / Q000473:pathology; D008297:Male; D008875:Middle Aged; D016016:Proportional Hazards Models; D051496:Receptor, Fibroblast Growth Factor, Type 1 / Q000235:genetics*; D046888:Tissue Array Analysis; D055815:Young Adult
C496348:FGFR1 protein, human; D051496:Receptor, Fibroblast Growth Factor, Type 1