Novel receptor tyrosine kinase targeted combination therapies for imatinib-resistant gastrointestinal stromal tumors (GIST)

Daruka Mahadevan, Noah Theiss, Carla Morales, Amy E. Stejskal, Laurence S. Cooke, Min Zhu, Drew Kurtzman, Rachel Swart, Evan Ong, Wenqing Qi

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Background: c-Kit/α-PDGFR targeted therapies are effective for gastrointestinal stromal tumors (GIST), but, >50% develop drug resistance. Methods: RTK expression (c-Kit, c-Met, AXL, HER-1, HER-2, IGF-1R) in pre-/post-imatinib (IM) GIST patient samples (n=16) and 4 GIST cell lines were examined for RTK inhibitor activity. GIST-882 cells were cultured in IM every other day, cells collected (1 week to 6 months) and analyzed by qRT-PCR and Western blotting. Results: Immunohistochemistry pre-/post-IM demonstrated continued expression of c-Kit and HER1, while a subset expressed IGF-1R, c-Met and AXL. In GIST cells (GIST-882, GIST430/654, GIST48) c-Kit, HER1 and c-Met are co-expressed. Acute IM over-express c-Kit while chronic IM, lose c-Kit and HER-1 in GIST882 cells. GIST882 and GIST430/654 cells have an IC50 0.077 and 0.59 μM to IM respectively. GIST48 have an IC50 0.66 μM to IM, 0.91 μM to amuvatinib [AMU] and 0.67 μM to erlotinib (Erl). Synergistic combinations: GIST882, AMU + Erl (CI 0.20); IM + AMU (CI 0.50), GIST430/654, IM + afatinib (CI 0.39); IM + AMU (CI 0.42), GIST48, IM + afatinib (CI 0.03); IM + AMU (CI 0.04); AMU + afatinib (CI 0.36); IM + Erl (CI 0.63). Conclusion: Targeting c-Kit plus HER1 or AXL/c-Met abrogates IM resistance in GIST.

Original languageEnglish (US)
Pages (from-to)1954-1966
Number of pages13
JournalOncotarget
Volume6
Issue number4
DOIs
StatePublished - 2015
Externally publishedYes

Keywords

  • Amuvatinib
  • Erlotinib
  • Gist
  • HER-1
  • Imatinib
  • c-Kit

ASJC Scopus subject areas

  • Oncology

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  • Cite this

    Mahadevan, D., Theiss, N., Morales, C., Stejskal, A. E., Cooke, L. S., Zhu, M., Kurtzman, D., Swart, R., Ong, E., & Qi, W. (2015). Novel receptor tyrosine kinase targeted combination therapies for imatinib-resistant gastrointestinal stromal tumors (GIST). Oncotarget, 6(4), 1954-1966. https://doi.org/10.18632/oncotarget.3021