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Cancer Cells and Metastasis
Research Guide
What is Cancer Cells and Metastasis?
Cancer cells and metastasis refers to the processes by which cancer cells acquire invasive properties, undergo epithelial-mesenchymal transition, interact with the tumor microenvironment including cancer stem cells, and disseminate to distant sites to form secondary tumors.
This field examines cancer stem cells, epithelial-mesenchymal transition, and tumor microenvironment interactions driving metastasis, drug resistance, and cell plasticity, with 82,603 papers published. Key studies identify tumorigenic breast cancer cells as a small subpopulation responsible for tumor initiation and propagation (Al-Hajj et al., 2003). Research also defines epithelial-mesenchymal transitions (EMTs) as sources of mesenchymal cells enabling tumor invasiveness and metastasis (Kalluri and Weinberg, 2009).
Topic Hierarchy
Research Sub-Topics
Cancer Stem Cells
Researchers investigate the identification, isolation, and functional properties of cancer stem cells that drive tumor initiation and propagation. Studies focus on their self-renewal mechanisms, markers such as CD44 and ALDH1, and contributions to relapse after therapy.
Epithelial-Mesenchymal Transition
This sub-topic examines the molecular mechanisms, regulators like TGF-β and Snail, and dynamic reversibility of EMT in promoting cancer cell motility and invasiveness. Research explores its role in therapy resistance and links to stemness acquisition.
Tumor Microenvironment
Studies analyze interactions between cancer cells and stromal components including fibroblasts, immune cells, and extracellular matrix in regulating metastasis. Key areas include niche formation, cytokine signaling, and remodeling during invasion.
Metastatic Colonization
Research focuses on how disseminated cancer cells adapt to and survive in distant organs, involving pre-metastatic niche preparation and outgrowth mechanisms. It covers organ-specific tropism and barriers like anoikis and immune surveillance.
Organoid Models in Cancer
This area develops and applies patient-derived organoids to model tumor progression, stem cell behavior, and metastasis in 3D contexts mimicking tissue architecture. Studies validate their use for personalized drug screening and metastasis assays.
Why It Matters
Understanding cancer cells and metastasis informs therapies targeting cancer stem cells and EMT to prevent dissemination and recurrence. Al-Hajj et al. (2003) identified a rare CD44+ CD24-/low subpopulation of breast cancer cells with tumorigenic potential, capable of forming tumors in immunocompromised mice at rates as low as 100 cells per injection, highlighting their role in metastasis. Hanahan and Weinberg (2011) outlined updated hallmarks including tumor-promoting inflammation and immune evasion, which facilitate metastatic colonization. Kalluri and Weinberg (2009) linked EMT to tumor invasiveness, with implications for drug resistance observed in breast cancer late recurrences beyond 10 years (Nishimura et al., 2013). These insights support organoid models for studying metastatic progression and stromal-immune admixtures in tumors (Yoshihara et al., 2013).
Reading Guide
Where to Start
"Prospective identification of tumorigenic breast cancer cells" by Al-Hajj et al. (2003) first, as it provides a foundational demonstration of cancer stem cells driving tumor formation with clear experimental evidence using xenograft models.
Key Papers Explained
"The Hallmarks of Cancer" (Hanahan and Weinberg, 2000) establishes core cancer properties including invasion and metastasis, updated in "Hallmarks of Cancer: The Next Generation" (Hanahan and Weinberg, 2011) to include microenvironment roles and plasticity. "Prospective identification of tumorigenic breast cancer cells" (Al-Hajj et al., 2003) builds on these by identifying specific breast cancer stem cells responsible for propagation. "The basics of epithelial-mesenchymal transition" (Kalluri and Weinberg, 2009) and "Epithelial-Mesenchymal Transitions in Development and Disease" (Thiery et al., 2009) explain EMT mechanisms enabling metastasis highlighted in the hallmarks papers. "Stem cells, cancer, and cancer stem cells" (Reya et al., 2001) connects stem cell biology to cancer initiation across these works.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current research emphasizes organoid models for cancer stem cells, tumor microenvironment regulation, and cell plasticity in drug resistance, as reflected in the 82,603 papers without specified recent preprints.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Hallmarks of Cancer: The Next Generation | 2011 | Cell | 64.9K | ✓ |
| 2 | The Hallmarks of Cancer | 2000 | Cell | 28.3K | ✓ |
| 3 | Minimal criteria for defining multipotent mesenchymal stromal ... | 2006 | Cytotherapy | 17.3K | ✕ |
| 4 | Evaluation of Factors Related to Late Recurrence - Later than ... | 2013 | Oncology | 13.2K | ✓ |
| 5 | Inferring tumour purity and stromal and immune cell admixture ... | 2013 | Nature Communications | 10.3K | ✓ |
| 6 | Prospective identification of tumorigenic breast cancer cells | 2003 | Proceedings of the Nat... | 10.3K | ✓ |
| 7 | Tumor Angiogenesis: Therapeutic Implications | 1971 | New England Journal of... | 10.1K | ✕ |
| 8 | The basics of epithelial-mesenchymal transition | 2009 | Journal of Clinical In... | 9.9K | ✓ |
| 9 | Epithelial-Mesenchymal Transitions in Development and Disease | 2009 | Cell | 9.8K | ✓ |
| 10 | Stem cells, cancer, and cancer stem cells | 2001 | Nature | 9.6K | ✓ |
Frequently Asked Questions
What are cancer stem cells in the context of metastasis?
Cancer stem cells represent a subpopulation of tumorigenic cells within tumors that drive metastasis and tumor propagation. Al-Hajj et al. (2003) prospectively identified CD44+ CD24-/low breast cancer cells that initiate tumors in immunocompromised mice using as few as 100 cells. Reya et al. (2001) connected stem cell properties to cancer initiation and progression, including metastatic potential.
How does epithelial-mesenchymal transition contribute to metastasis?
Epithelial-mesenchymal transition (EMT) enables cancer cells to gain mesenchymal traits for invasiveness and metastasis. Kalluri and Weinberg (2009) described EMT as a source of mesenchymal cells in tumor progression and tissue fibrosis. Thiery et al. (2009) detailed EMT roles in development and disease, including cancer cell dissemination.
What is the role of the tumor microenvironment in metastasis?
The tumor microenvironment, including stromal and immune cells, regulates cancer cell behavior and metastatic colonization. Yoshihara et al. (2013) developed a method to estimate stromal and immune cell admixture from expression data, showing their major fraction in tumor tissue. Hanahan and Weinberg (2011) identified microenvironment interactions as hallmarks sustaining proliferative signaling and metastasis.
How are cancer stem cells identified in tumors?
Cancer stem cells are identified by surface markers and functional assays in xenograft models. Al-Hajj et al. (2003) used CD44+ CD24-/low markers to isolate tumorigenic breast cancer cells. Reya et al. (2001) linked these properties to normal stem cell hierarchies adapted in cancer.
What factors relate to late breast cancer recurrence?
Late recurrences beyond 10 years in breast cancer link to specific prognostic factors. Nishimura et al. (2013) evaluated factors like tumor characteristics associated with late relapse after initial treatment. These findings connect to persistent cancer stem cell activity driving metastasis.
Open Research Questions
- ? How do cancer stem cells evade drug therapies to enable metastatic relapse?
- ? What regulatory mechanisms in the tumor microenvironment control metastatic colonization?
- ? Which molecular pathways link epithelial-mesenchymal transition to cancer cell plasticity?
- ? How can organoid models accurately recapitulate metastatic behavior of cancer stem cells?
- ? What distinguishes tumorigenic subpopulations in diverse cancer types beyond breast cancer?
Recent Trends
The field encompasses 82,603 works on cancer stem cells, EMT, and metastasis, with foundational papers like Hanahan and Weinberg (2011; 64,861 citations) and Al-Hajj et al. (2003; 10,294 citations) dominating citations.
Growth rate over 5 years is not available.
No recent preprints or news in the last 12 months reported.
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