Triple-negative breast cancer is associated with a poor prognosis and treatment options are limited. The Poly (ADP-ribose) polymerase (PARP) inhibitors, olaparib and talazoparib, were recently approved for metastatic breast cancer (including triple-negative breast cancer) in patients with a germline BRCA1/2 mutation. Despite impressive response rates of ~60%, the prolongation in median progression-free survival with PARP inhibitors is modest, suggesting the emergence of resistance. We previously demonstrated that c-MET contributes to intrinsic resistance to PARP inhibitors in triple-negative breast cancer. However, whether c-MET plays a role in acquired resistance to PARP inhibitors in triple-negative breast cancer remains unclear. Here, we show that phospho-c-MET expression is higher in PARP inhibitor-resistant triple-negative breast cancer cells and the combination of talazoparib and crizotinib (multi-kinase inhibitor that inhibits c-MET) results in synergistic inhibition of cellular proliferation in PARP inhibitor-resistant cells. However, depleting c-MET in PARP inhibitor resistant cells had limited effect on talazoparib sensitivity. Notably, we found that c-MET interacts with the epidermal growth factor receptor (EGFR) in PARP inhibitor-resistant triple-negative breast cancer cells, potentially explaining the limited effect of c-MET depletion alone on talazoparib sensitivity. Together, these data suggest that the combination of c-MET, EGFR and PARP inhibition should be explored in future studies.
","abstract_html":"<p>Triple-negative breast cancer is associated with a poor prognosis and treatment options are limited. The Poly (ADP-ribose) polymerase (PARP) inhibitors, olaparib and talazoparib, were recently approved for metastatic breast cancer (including triple-negative breast cancer) in patients with a germline <em>BRCA1/2</em> mutation. Despite impressive response rates of ~60%, the prolongation in median progression-free survival with PARP inhibitors is modest, suggesting the emergence of resistance. We previously demonstrated that c-MET contributes to intrinsic resistance to PARP inhibitors in triple-negative breast cancer. However, whether c-MET plays a role in acquired resistance to PARP inhibitors in triple-negative breast cancer remains unclear. Here, we show that phospho-c-MET expression is higher in PARP inhibitor-resistant triple-negative breast cancer cells and the combination of talazoparib and crizotinib (multi-kinase inhibitor that inhibits c-MET) results in synergistic inhibition of cellular proliferation in PARP inhibitor-resistant cells. However, depleting c-MET in PARP inhibitor resistant cells had limited effect on talazoparib sensitivity. Notably, we found that c-MET interacts with the epidermal growth factor receptor (EGFR) in PARP inhibitor-resistant triple-negative breast cancer cells, potentially explaining the limited effect of c-MET depletion alone on talazoparib sensitivity. Together, these data suggest that the combination of c-MET, EGFR and PARP inhibition should be explored in future studies.</p>","abstract_has_math":false,"creators":["Yam, Clinton","https://orcid.org/0000-0002-0809-0851
"],"institution":null,"degree_name":"Masters of Science (MS)","degree_level":"Thesis (MS)","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Jeffrey Chang (on-site)","Mien-Chie Hung","Bin Wang"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-08-01T07:00:00Z","date_published":"2019-08-01T07:00:00Z","updated_at":"2026-07-24T05:50:31Z","subjects":["Triple-negative breast cancer","PARP inhibitors","resistance","c-MET","EGFR","Biology","Medicine and Health Sciences"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.library.tmc.edu/utgsbs_dissertations/952","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Jeffrey Chang (on-site)","Mien-Chie Hung","Bin Wang"]},{"key":"dc:creator","label":"Author","values":["Yam, Clinton","https://orcid.org/0000-0002-0809-0851
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"]},{"key":"dc:title","label":"Title","values":["Role of C-Met and Egfr In Acquired Resistance to Parp Inhibitors In Triple-Negative Breast Cancer"]}]}],"canonical_facts":{"dc:contributor":["Jeffrey Chang (on-site)","Mien-Chie Hung","Bin Wang"],"dc:creator":["Yam, Clinton","https://orcid.org/0000-0002-0809-0851
"],"dc:date.available":["2020-06-20T07:00:00Z"],"dc:description.abstract":["Triple-negative breast cancer is associated with a poor prognosis and treatment options are limited. The Poly (ADP-ribose) polymerase (PARP) inhibitors, olaparib and talazoparib, were recently approved for metastatic breast cancer (including triple-negative breast cancer) in patients with a germline BRCA1/2 mutation. Despite impressive response rates of ~60%, the prolongation in median progression-free survival with PARP inhibitors is modest, suggesting the emergence of resistance. We previously demonstrated that c-MET contributes to intrinsic resistance to PARP inhibitors in triple-negative breast cancer. However, whether c-MET plays a role in acquired resistance to PARP inhibitors in triple-negative breast cancer remains unclear. Here, we show that phospho-c-MET expression is higher in PARP inhibitor-resistant triple-negative breast cancer cells and the combination of talazoparib and crizotinib (multi-kinase inhibitor that inhibits c-MET) results in synergistic inhibition of cellular proliferation in PARP inhibitor-resistant cells. However, depleting c-MET in PARP inhibitor resistant cells had limited effect on talazoparib sensitivity. Notably, we found that c-MET interacts with the epidermal growth factor receptor (EGFR) in PARP inhibitor-resistant triple-negative breast cancer cells, potentially explaining the limited effect of c-MET depletion alone on talazoparib sensitivity. Together, these data suggest that the combination of c-MET, EGFR and PARP inhibition should be explored in future studies.
"],"dc:identifier":["https://digitalcommons.library.tmc.edu/utgsbs_dissertations/952"],"dc:subject":["Triple-negative breast cancer","PARP inhibitors","resistance","c-MET","EGFR","Biology","Medicine and Health Sciences"],"dc:title":["Role of C-Met and Egfr In Acquired Resistance to Parp Inhibitors In Triple-Negative Breast Cancer"],"thesis:degree_level":["Thesis (MS)"],"thesis:degree_name":["Masters of Science (MS)"]},"updated_at":"2026-07-24T05:50:31Z"}