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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Related Experiment Video

Updated: Feb 10, 2026

A Protocol for Explant Cultures of IDH1-mutant Diffuse Low-grade Gliomas
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Diffuse Gliomas for Nonneuropathologists: The New Integrated Molecular Diagnostics.

Sunhee C Lee1

  • 1From the Department of Pathology, Albert Einstein College of Medicine, and the Department of Neuropathology, Montefiore Medical Center, Bronx, New York.

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Summary

The 2016 World Health Organization classification update for diffuse gliomas integrates genetic markers like isocitrate dehydrogenases (IDHs) mutations. This molecular approach improves tumor classification and patient survival prediction over traditional histology.

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Area of Science:

  • Neuropathology and Molecular Oncology
  • Central Nervous System Tumor Classification

Background:

  • Diffuse gliomas represent the majority of adult brain cancers.
  • The 2016 World Health Organization (WHO) classification introduced significant changes impacting diagnosis and patient management.
  • Isocitrate dehydrogenases (IDHs) mutations are key genetic alterations revolutionizing glioma understanding and classification.

Purpose of the Study:

  • To review the 2016 WHO classification update for diffuse gliomas.
  • To summarize critical gene abnormalities driving these new classifications.
  • To discuss practical diagnostic workup and compare testing methodologies.

Main Methods:

  • Integration of genetic parameters: IDH mutations, ATRX/p53 status, and 1p19q codeletion.
  • Development of a diagnostic algorithm based on molecular information.
  • Comparison of diagnostic tests including immunohistochemistry and next-generation sequencing (NGS).

Main Results:

  • Molecular classification, particularly IDH mutational status, provides more robust patient survival correlation than histology alone.
  • IDH-wild-type diffuse gliomas exhibit behavior similar to IDH-wild-type glioblastomas ('molecular GBM').
  • A shift in diagnostic neuropathology towards molecular data for risk stratification.

Conclusions:

  • The 2016 WHO classification fundamentally alters diffuse glioma diagnosis and management.
  • Molecular markers are essential for accurate classification and prognostication.
  • Targeted NGS panels are emerging as a universal diagnostic approach.