Yondelis ( Trabectedin ) I+D para el Tratamiento de OsteoSarcomas ( OS ) . The Combination With a PD-1-Blocking Antibody Significantly Increased Yondelis Efficacy in Controlling OsteoSarcoma Progression.

OVERRIDES OSTEOSARCOMA DIFFERENTIATIVE BLOCK AND REPROGRAMS THE TUMOR IMMUNE ENVIRONMENT ENABLING EFFECTIVE COMBINATION WITH IMMUNE CHECKPOINT INHIBITORS.

Clin Cancer Res. 2017 June .

Ratti C, Botti L, Cancila V, Galvan S, Torselli I, Garofalo C, Manara MC, Bongiovanni L, Valenti CF, Burocchi A, Parenza M, Cappetti B, Sangaletti S, Tripodo C, Scotlandi K, Colombo MP, Chiodoni C.

Abstract /// Purpose: 

Osteosarcoma (OS), the most common primary bone tumor, is characterized by an aggressive behavior with high tendency to develop lung metastases as well as by multiple genetic aberrations that have hindered the development of targeted therapies. New therapeutic approaches are urgently needed; however, novel combinations with immunotherapies and checkpoint inhibitors require suitable preclinical models with intact immune systems to be properly tested.

Experimental Design: 

We have developed immuno-competent OS models that grow orthotopically in the bone and spontaneously metastasize to the lungs, mimicking human OS. These models have been used to test the efficacy of trabectedin, a chemotherapeutic drug utilized clinically for sarcomas and ovarian cancer.

Results: 

Trabectedin, as monotherapy, significantly inhibited OS primary tumor growth and lung metastases by both targeting neoplastic cells and reprogramming the tumor immune microenvironment. Specifically, trabectedin induced a striking differentiation of tumor cells by favoring the recruitment of Runx2, the master genetic regulator of osteoblastogenesis, on the promoter of genes involved in the physiologic process of terminal osteoblast differentiation. Differentiated neoplastic cells, as expected, showed reduced proliferation rate. Concomitantly, trabectedin enhanced the number of tumor-infiltrating T lymphocytes, with local CD8 T cells, however, likely post-activated or exhausted, as suggested by their high expression of the inhibitory checkpoint molecule PD-1. Accordingly, the combination with a PD-1-blocking antibody significantly increased trabectedin efficacy in controlling OS progression.

Conclusion: 

These Results Demonstrate the therapeutic efficacy of trabectedin in OS treatment, unveiling its multiple activities and providing a solid rationale for its combination with immune checkpoint inhibitors.

Copyright ©2017, American Association for Cancer Research.

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ET-743 . Gene and MicroRNA Modulation Upon ET-743 Treatment in a Human Intrahepatic Cholangiocarcinoma Paired Patient Derived Xenograft and Cell Line [ Gene Expression ] .

Public on Jun 10, 2017 .

Organism : Homo sapiens .


Experiment Type: 
Expression profiling by array .

Summary  : 

Transcriptional profiling and microRNA profiling of paired PDX and derived cell line MT-CHC01 upon ET-743 treatement .

Intrahepatic cholangiocarcinoma (ICC) is an aggressive and lethal malignancy with limited therapeutic options. ET-743 has a high antitumor activity in preclinical models of biliary tract carcinoma (BTC), being a promising alternative treatment. Here, we studied the effect of ET-743 at transcriptomic level on an ICC patient derived xenograft (PDX) and on the derived cell line, MT-CHC01. Further, putative targets of ET-743 were explored in the in vitro model. In vitro, ET-743 inhibited genes involved in protein modification, neurogenesis, migration, and motility; it induced the expression of genes involved in keratinization, tissues development, and apoptotic processes. In the PDX model, ET-743 affected ECM-receptor interaction, focal adhesion, complement and coagulation cascades, Hedgehog, MAPK, EGFR signaling via PIP3 pathway, and apoptosis. In MT-CHC01, 24 microRNAs were deregulated upon drug treatment. Only 5 microRNAs were perturbed by ET-743 in PDX; 2 up and 3 down-regulated. Among down- regulated genes, we selected SYK and LGALS1; their silencing caused a significantly reduction of migration, but did not affect proliferation in MT-CHC01 and WITT cells. In conclusion, we described that ET-743 affected genes and microRNAs involved in tumor progression and metastatic processes, reflecting data previously obtained at macroscopically level; in particular, we identified SYK and LGALS1 as new putative targets of ET-743.

Overall design :

MT-CHC01 cell line treated with ET-743 at the dose of 5 nM for 24 hours vs MT-CHC01 cell line untreated;ICC PDX treated with ET-743 at the dose of 0.15 mg/Kg/weekly for three weeks vs ICC PDX untreated .