TY - JOUR
T1 - Expression of delta-like protein 3 is reproducibly present in a subset of small cell lung carcinomas and pulmonary carcinoid tumors
AU - Xie, Hao
AU - Boland, Jennifer M.
AU - Maleszewski, Joseph J.
AU - Aubry, Marie Christine
AU - Yi, Eunhee S.
AU - Jenkins, Sarah M.
AU - Koepplin, Justin W.
AU - Terra, Simone B.S.P.
AU - Mansfield, Aaron S.
AU - Roden, Anja C.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/9
Y1 - 2019/9
N2 - Objectives: Delta-like protein 3 (DLL3), an inhibitory Notch ligand, is the target for rovalpituzumab tesirine in development for the treatment of small cell lung cancer (SCLC). We studied the expression of DLL3, its reproducibility and prognostic role in pulmonary neuroendocrine tumors. Materials and Methods: Institutional pathology files were searched for resected pulmonary neuroendocrine tumors (1995–2017). Expression of DLL3 (clone SP347) was categorized as high (≥50% of tumor cells) or low (<50%). Interobserver agreement among 5 thoracic pathologists was measured by Krippendorff's α coefficient. Staging (N = 148) was performed according to the 8th AJCC. Results: Our study included 157 patients with a median age of 62.2 years (range 23.2–88.1) including 59 men (37.6%). Tumors included 44 (28.0%) SCLC, 46 (29.3%) atypical and 67 (42.7%) typical carcinoid tumors at stages I (N = 83, 56.1%), II (N = 28, 18.9%), and III/IV (N = 37, 25.0%). Interobserver agreement for high vs low DLL3 expression (N = 70) was 82.9% (α = 0.79, substantial). High DLL3 expression was observed in 35 (79.5%) SCLC, 17 (37.0%) atypical and 22 (32.8%) typical carcinoid tumors. High DLL3 was associated with SCLC morphology (p < 0.0001). During a median follow-up of 4.2 years (range, 2 days–20.3 years), 70 patients died; 19 died from disease. High DLL3 expression was associated with better overall survival in SCLC (p = 0.049) but not after adjusting for age, tumor size and stage. Conclusions: DLL3 expression is reliably quantifiable by pathologists and is highly expressed in the majority of SCLC and a subset of carcinoid tumors, making it an attractive target for anti-DLL3 treatment.
AB - Objectives: Delta-like protein 3 (DLL3), an inhibitory Notch ligand, is the target for rovalpituzumab tesirine in development for the treatment of small cell lung cancer (SCLC). We studied the expression of DLL3, its reproducibility and prognostic role in pulmonary neuroendocrine tumors. Materials and Methods: Institutional pathology files were searched for resected pulmonary neuroendocrine tumors (1995–2017). Expression of DLL3 (clone SP347) was categorized as high (≥50% of tumor cells) or low (<50%). Interobserver agreement among 5 thoracic pathologists was measured by Krippendorff's α coefficient. Staging (N = 148) was performed according to the 8th AJCC. Results: Our study included 157 patients with a median age of 62.2 years (range 23.2–88.1) including 59 men (37.6%). Tumors included 44 (28.0%) SCLC, 46 (29.3%) atypical and 67 (42.7%) typical carcinoid tumors at stages I (N = 83, 56.1%), II (N = 28, 18.9%), and III/IV (N = 37, 25.0%). Interobserver agreement for high vs low DLL3 expression (N = 70) was 82.9% (α = 0.79, substantial). High DLL3 expression was observed in 35 (79.5%) SCLC, 17 (37.0%) atypical and 22 (32.8%) typical carcinoid tumors. High DLL3 was associated with SCLC morphology (p < 0.0001). During a median follow-up of 4.2 years (range, 2 days–20.3 years), 70 patients died; 19 died from disease. High DLL3 expression was associated with better overall survival in SCLC (p = 0.049) but not after adjusting for age, tumor size and stage. Conclusions: DLL3 expression is reliably quantifiable by pathologists and is highly expressed in the majority of SCLC and a subset of carcinoid tumors, making it an attractive target for anti-DLL3 treatment.
KW - Carcinoid tumors
KW - DLL3
KW - Rovalpituzumab tesirine
KW - Small cell lung cancer
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U2 - 10.1016/j.lungcan.2019.07.016
DO - 10.1016/j.lungcan.2019.07.016
M3 - Article
C2 - 31447005
AN - SCOPUS:85069586666
SN - 0169-5002
VL - 135
SP - 73
EP - 79
JO - Lung Cancer
JF - Lung Cancer
ER -