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Lymph Node Metastases in Colon Cancer Are Polyclonal.

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Colorectal cancer lymph node metastases originate from multiple tumor subclones seeding over time. This study reveals significant genetic heterogeneity within primary tumors and their spread to lymph nodes.

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Area of Science:

  • Oncology
  • Genetics
  • Cancer Metastasis

Background:

  • Tumor subclones exist within primary cancers.
  • Lymph node metastasis is common in colorectal cancer.
  • Understanding metastasis origin is crucial for treatment.

Purpose of the Study:

  • Investigate the genetic origin of colorectal cancer lymph node metastasis.
  • Analyze the relationship between primary tumor subclones and lymph node metastases.
  • Profile tumor heterogeneity and clonal evolution in metastasis.

Main Methods:

  • Whole-exome DNA sequencing and SNP arrays on 33 colorectal cancer samples.
  • Analysis of spatially disparate primary tumor regions and matched lymph nodes.
  • Utilized PyClone for subclone identification and CITUP for phylogenetic inference.

Main Results:

  • Significant genetic heterogeneity (mutations, copy number changes) observed in all patient samples.
  • Primary tumors and lymph node metastases were polyclonal with differing clonal populations.
  • Lymph node metastases can arise from multiple distinct primary tumor regions.

Conclusions:

  • Colorectal cancer lymph node metastasis involves multiple seeding events from the primary tumor.
  • Metastatic spread is a dynamic process driven by polyclonal tumor populations.
  • This supports a model of sequential seeding from diverse primary tumor subclones.