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Park YS, kim J, Ryu YS, moon JH, shin YJ, kim JH, hong SW, jung SA, lee S, kim SM, lee DH, kim DY, yun H, you JE, yoon DI, kim CH, koh DI, jin DH. Mutant PIK3CA as a negative predictive biomarker for treatment with a highly selective PIM1 inhibitor in human colon cancer. Cancer Biol Ther 2023; 24:2246208. [PMID: 37621144 PMCID: PMC10461515 DOI: 10.1080/15384047.2023.2246208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 02/07/2023] [Accepted: 06/02/2023] [Indexed: 08/26/2023] Open
Abstract
Significant improvement in targeted therapy for colorectal cancer (CRC) has occurred over the past few decades since the approval of the EGFR inhibitor cetuximab. However, cetuximab is used only for patients possessing the wild-type oncogene KRAS, NRAS, and BRAF, and even most of these eventually acquire therapeutic resistance, via activation of parallel oncogenic pathways such as RAS-MAPK or PI3K/Akt/mTOR. The two aforementioned pathways also contribute to the development of therapeutic resistance in CRC patients, due to compensatory and feedback mechanisms. Therefore, combination drug therapies (versus monotherapy) targeting these multiple pathways may be necessary for further efficacy against CRC. In this study, we identified PIK3CA mutant (PIK3CA MT) as a determinant of resistance to SMI-4a, a highly selective PIM1 kinase inhibitor, in CRC cell lines. In CRC cell lines, SMI-4a showed its effect only in PIK3CA wild type (PIK3CA WT) cell lines, while PIK3CA MT cells did not respond to SMI-4a in cell death assays. In vivo xenograft and PDX experiments confirmed that PIK3CA MT is responsible for the resistance to SMI-4a. Inhibition of PIK3CA MT by PI3K inhibitors restored SMI-4a sensitivity in PIK3CA MT CRC cell lines. Taken together, these results demonstrate that sensitivity to SMI-4a is determined by the PIK3CA genotype and that co-targeting of PI3K and PIM1 in PIK3CA MT CRC patients could be a promising and novel therapeutic approach for refractory CRC patients.
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Affiliation(s)
- Yoon Sun Park
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Joseph kim
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Yea Seong Ryu
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Jai-Hee moon
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Yu Jin shin
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Jeong Hee kim
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Seung-Woo hong
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Soo-A jung
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Seul lee
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Seung-Mi kim
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Dae Hee lee
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Do Yeon kim
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Hyeseon yun
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Ji-Eun you
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Dong Il yoon
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Chul Hee kim
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
- Department of Medical Science, Asan Medical Institute of Convergence Science and Technology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Dong-In koh
- Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
| | - Dong-Hoon jin
- Department of Pharmacology, University of Ulsan College of Medicine, Seoul, Republic of Korea
- Department of Convergence Medicine, Asan Institute for Life Science, Asan Medical Center, Seoul, Republic of Korea
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