Abstract
Tumor heterogeneity and the presence of drug-sensitive and refractory populations within the same tumor are almost never assessed in the drug discovery pipeline. Such incomplete assessment of drugs arising from spatial and temporal tumor cell heterogeneity reflects on their failure in the clinic and considerable wasted costs in the drug discovery pipeline. Here we report the derivation of a flow cytometry-based tumor deconstruction platform for resolution of at least 18 discrete tumor cell fractions. This is achieved through concurrent identification, quantification and analysis of components of cancer stem cell hierarchies, genetically instable clones and differentially cycling populations within a tumor. We also demonstrate such resolution of the tumor cytotype to be a potential value addition in drug screening through definitive cell target identification. Additionally, this real-time definition of intra-tumor heterogeneity provides a convenient, incisive and analytical tool for predicting drug efficacies through profiling perturbations within discrete tumor cell subsets in response to different drugs and candidates. Consequently, possible applications in informed therapeutic monitoring and drug repositioning in personalized cancer therapy would complement rational design of new candidates besides achieving a re-evaluation of existing drugs to derive non-obvious combinations that hold better chances of achieving remission.
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Acknowledgements
We appreciate the efforts of Dr Mrunalini Moghe (Deenanath Mangeshkar Hospital, Pune) and Dr Anjali Kusumbe in karyotyping, Mr Swapnil Kamble in cryosectioning and thank Dr Shona Nag (Jehangir Hospital, Pune) for providing gemcitabine. This research is supported by NCCS intra-mural grants to SAB.
Author Contributions
RRN performed experiments, analyzed data, assisted manuscript drafting and carried out reviewer suggested revisions; AKS performed epigenetic drug-associated experiments, analyzed data and assisted manuscript drafting; AMM assisted with in vivo experiments; MFK analyzed data for derivation of checker board representation of drug responses; and SAB conceived the project, planned and finalized experimental design, analyzed data, drafted and edited the manuscript and its revision.
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Following patents have been filed relating to the findings of this manuscript, 173/MUM/2014, PCT/IB2015/050358, and Indian provisional patent application 2980/MUM/2014.
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Naik, R., Singh, A., Mali, A. et al. A tumor deconstruction platform identifies definitive end points in the evaluation of drug responses. Oncogene 35, 727–737 (2016). https://doi.org/10.1038/onc.2015.130
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DOI: https://doi.org/10.1038/onc.2015.130
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