Study

Therapeutic Resistance to PI3K-alpha Inhibitors

Study ID Alternative Stable ID Type
EGAS00001000991 Other

Study Description

We have studied the tumor genomic evolution in a patient with metastatic breast cancer bearing an activating PIK3CA mutation. The patient was treated with the PI3Kα inhibitor BYL719 and achieved a lasting clinical response on BYL719, but eventually progressed to treatment and died shortly thereafter. A rapid autopsy was performed and a total of 14 metastatic lesions were collected for further analysis. In order to identify possible genetic determinants of acquired resistance to PI3Kα inhibition, we took a three-step approach. First, we examined both the primary tumor (before BYL719 treatment) and the new lung metastasis by whole genome sequencing (DNA from the spleen was used as a normal control). Then, we analyzed the primary tumor, lung metastasis, and the peri-aortic lesion that remained stable (responding) at the time of progression to BYL719 therapy by whole exome sequencing. Finally, to confirm and expand our findings, we sequenced the primary tumor and all the metastatic lesions to >500-fold coverage using a custom targeted deep-sequencing assay, MSK-IMPACT. Using this ... (Show More)

Study Datasets 2 datasets.

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Dataset ID Description Technology Samples
EGAD00001001252
DNA was derived from the primary tumour, lung metastasis, and peri-aortic lymph node metastasis. DNA from the spleen was used as a normal control.For WE sequencing we user Hybrid capture (Nimblegen version 3.0) of the lymph node and lung metastases, primary tumour and spleen normal; we generated ~100-fold coverage.
4
EGAD00001001253
DNA was derived from the primary tumour, lung metastasis, and peri-aortic lymph node metastasis. DNA from the spleen was used as a normal control.WG sequencing produced ~30-fold (primary tumour, spleen normal)-50-fold (lung metastasis) coverage
3

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