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06:46
Competing-Risk Nomogram for Predicting Cancer-Specific Survival in Multiple Primary Colorectal Cancer Patients after Surgery
Published on: September 27, 2024
Variable clonal repopulation dynamics influence chemotherapy response in colorectal cancer.
Antonija Kreso1, Catherine A O'Brien, Peter van Galen
1Campbell Family Institute, Ontario Cancer Institute, Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.
Science (New York, N.Y.)
|December 15, 2012
Summary
Cancer cells within the same genetic clone show functional differences. This variability impacts tumor growth and treatment response, even without genetic changes.
Area of Science:
- Oncology
- Cancer Biology
- Genetics
Background:
- Intratumoral heterogeneity is a hallmark of cancer, driven by genetically diverse subclones.
- The functional equivalence of cells within a single genetic clone remains poorly understood.
Purpose of the Study:
- To investigate functional variability among cells within genetically identical clones in colorectal cancer.
- To determine if non-genetic factors contribute to tumor cell behavior and treatment resistance.
Main Methods:
- Utilized DNA copy number alteration (CNA) profiling and sequencing to characterize tumor clones.
- Employed lentiviral lineage tracking to monitor the dynamics of 150 single-cell lineages across serial xenografts in mice.
- Assessed proliferation, persistence, and chemotherapy tolerance of marked lineages within clones.
Main Results:
- Clones remained genetically stable during serial transplantation.
- Significant functional variability in proliferation, persistence, and chemotherapy tolerance was observed among lineages within the same clone.
- Chemotherapy treatment favored the expansion of previously minor or dormant lineages.
Conclusions:
- Tumor cells exhibit inherent functional variability independent of genetic diversity.
- This functional plasticity contributes significantly to tumor progression and therapeutic tolerance.
- Understanding non-genetic variability is crucial for developing effective cancer therapies.
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