At present, the first-line treatment for advanced intrahepatic cholangiocarcinoma (ICC) is gemcitabine combined with cisplatin, but a considerable portion of ICC patients exhibit resistance to gemcitabine. Therefore, finding sensitisers for gemcitabine chemotherapy in ICC patients and predicting molecular markers for chemotherapy efficacy have become urgent needs.
In this study, PDX models were established to conduct gemcitabine susceptibility tests. The selected PDX tissues of the chemotherapy-sensitive group and drug-resistant group were subjected to transcriptome sequencing and protein chip technology to identify the key genes. Sixty-one ICC patients treated with gemcitabine chemotherapy were recruited for clinical follow-up validation.
We found that thrombospondin-1 (TSP1) can predict gemcitabine chemosensitivity in ICC patients. The expression level of TSP1 could reflect the sensitivity of ICC patients to gemcitabine chemotherapy. Functional experiments further confirmed that TSP1 can increase the efficacy of gemcitabine chemotherapy for ICC. A mechanism study showed that TSP1 may affect the intake of oleic acid by binding to the CD36 receptor.
In summary, we found a key molecule—TSP1—that can predict and improve the sensitivity of ICC patients to gemcitabine chemotherapy, which is of great significance for the treatment of advanced cholangiocarcinoma.
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All presented data are available from the corresponding author upon reasonable request.
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Thank all participants for their support and help.
This study was supported by the National Natural Science Foundation of China (81972575,81903059, 81802983), the San Hang Program of the Second Military Medical University, and Shanghai Municipal Commission of Health and Family Planning Program (20174Y0085).
The authors declare no competing interests.
Ethics approval and consent to participate
This study was performed with the approval of the Ethics Committee of the Third Affiliated Hospital of Navy Medical University (ethical authorisation protocol numbers: EHBHKY201802012).
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Ding, Dy., Gan, Xj., Zhang, Jn. et al. Serum thrombospondin-1 serves as a novel biomarker and agonist of gemcitabine-based chemotherapy in intrahepatic cholangiocarcinoma. Br J Cancer 128, 907–917 (2023). https://doi.org/10.1038/s41416-022-02101-0