Abstract
Purpose
New generation of receptor tyrosine kinase inhibitors (RTKIs) have shown to improve survival in many solid tumors. However, an imaging biomarker is needed for patient selection and prediction of treatment response. This study evaluates the use of quantitative changes of HER3 on 68 Ga-NOTA-HER3P1 PET/MRI for prediction of early response to pan-RTKIs in gastric cancer (GCa).
Procedures
GCa cell lines were evaluated for expression of RTKs, and downstream signaling pathways (AKT and MAPK). Cell viability was assessed following 24–72 h of treatment with 0.01–1 µmol/L of afatinib, a pan-RTKI. HER3-expressing afatinib-sensitive (NCI-N87) and resistant cells (SNU16) were selected for evaluation of changes in RTKs expression and downstream pathways, with 24–72 h of 0.1 µmol/L afatinib treatment. 68 Ga-NOTA-HER3P1 PET/MRI was performed in subcutaneous NCI-N87 and SNU16 xenografts (nu:nu, n = 12/group) at baseline and 4 days after afatinib treatment (10 mg/kg, PO, daily). Temporal changes in PET measures were correlated to HER3 expression in tumors, tumor growth rate, and treatment response.
Results
With afatinib therapy, NCI-N87 cells showed increased total HER3 expression, and reduction of other RTKs and downstream nodes within 72 h, while SNU16 cells showed no significant change in total HER3 and downstream nodes. 68 Ga-HER3P1 PET/MRI showed increased uptake in NCI-N87 and no significant change in SNU16 tumors (day 4 vs. baseline SUVmean: 3.8 ± 0.7 vs. 1.6 ± 0.6, p < 0.05 in NCI-N87, and 1.5 ± 0.7 vs. 1.7 ± 0.7, p > 0.05 in SNU16). These findings were in concordance with HER3 expression in histopathological analyses and tumor growth over 3 weeks of treatment (mean tumor volume in treated vs. control: 11 ± 17 mm3 vs. 293 ± 79 mm3, p < 0.001 in NCI-N87, and 238 ± 91 mm3 vs. 282 ± 35 mm3, p > 0.05 in SNU16).
Conclusions
Quantitative changes in HER3 PET could be used to predict response to pan-RTKI within few days after initiation of treatment and can help with personalizing GCa management.
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Acknowledgements
Authors are grateful to Chris Farrar, PhD for his help with developing PET/MR imaging acquisition techniques.
Funding
This study was supported by RSNA R&E Foundation Grant and Ralph Schlaeger Research Fellowship Grant from Massachusetts General Hospital (PI: S.A.E), R01CA211223 (PI: U.M.), S10-OD023503 (PI: P.C.), and R21GM137227 (PI: Y.Y.) from NIH. S.K. is supported by the NIH CaNCURE Nanomedicine Research program 5R25CA174650. P.H. is supported by the NCI K08CA249047. S.A.E. is supported by the NCI K08CA259626-A1.
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All authors contributed to the concept and design of the study. S.A.E., C.A.F., Y.Y., N.J.R., P.H., B.A., S.K., and O.C. contributed to the acquisition of the data. S.A.E., P.H., and C.A.F. drafted the manuscript. All authors contributed to the analysis and interpretation of the data, and they read, critically revised, and approved the final version of the manuscript and all of them agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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U.M. is a cofounder and consultant of CytoSite Biopharma, a company focused on development of PET probes for immuno-oncology and has received support (materials) from Daiichi Sankyo related to HER3, but not used in the current study. All other authors do not have relevant conflicts of interest.
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11307_2022_1763_MOESM1_ESM.jpg
Supplementary file1 (JPG 327 KB) Supplemental Fig.1. Western blot analyses of NCI-N87 and SNU16 cells before and after 72 hours of treatment with afatinib (0.1 µmol/L) in the presence of recombinant human neuregulin 1 (NRG, 50 ng/mL) in the cell media. Total HER3 level significantly increases in afatinib-sensitive NCI-N87 cells and slightly decreases in afatinib-resistant SNU16 cells at 72 hours after treatment although not statistically significant. There is a significant decrease and inhibition of phosphorylated forms of other RTKs and downstream AKT and MAPK in the NCI-N87 cells. In SNU16 cells, there is inhibition of phosphorylated forms of RTKs but sustained levels of activated AKT and MAPK. Results are shown with three to four replicates. ns: not statistically significant, *: p < 0.05
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Supplementary file2 (JPG 385 KB) Supplemental Fig.2. Evaluation of the changes in MET and pMET in NCI-N87 and SNU16 cells before and after treatment with afatinib (0.1 µmol/L) in the presence and absence of human recombinant neuregulin 1 (NRG, 50 ng/mL). Western blot analyses show expression of MET and pMET in the untreated cells regardless of the presence or absence of the NRG. In NCI-N87 cells, total MET significantly decreases while pMET level does not significantly change in response to afatinib. In SNU16 cells, total MET does not significantly change, while the pMET level significantly increases after treatment with afatinib. Addition of NRG to the cell media does not show a significant difference in the changes of MET and pMET in either cells line. Results are shown with three to four replicates. ns: not statistically significant, *: p < 0.05, **: p < 0.001
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Supplementary file3 (JPG 3343 KB) Supplemental Fig.3. Representative hematoxylin and eosin (H&E), and Ki-67 (as marker of cell proliferation) and caspase-3 (as marker of apoptosis) immunohistochemical staining of extracted tumor tissues at baseline, 4 and 21 days after treatment with afatinib 10 mg/kg/day. a) Afatinib treatment of NCI-N87 tumors results in temporal increase in tumor cell density on H&E, decrease in Ki67 cell proliferation marker, and increase in caspase-3 apoptosis marker. b) Afatinib-resistant SNU16 tumors show continuous increase in tumor cell density on H&E, increase in proliferation marker Ki67 and no significant increase in tumor apoptosis on caspase-3 staining. (X10 magnification)
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Esfahani, S.A., de Aguiar Ferreira, C., Rotile, N.J. et al. HER3 PET Imaging Predicts Response to Pan Receptor Tyrosine Kinase Inhibition Therapy in Gastric Cancer. Mol Imaging Biol 25, 353–362 (2023). https://doi.org/10.1007/s11307-022-01763-9
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DOI: https://doi.org/10.1007/s11307-022-01763-9