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Related Concept Videos

Quantitative Analysis01:12

Quantitative Analysis

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Quantitative analysis is a technique for measuring the amount of specific constituents in a sample. When the sample's composition is unknown, qualitative analysis is performed first to identify its components, which ensures that the correct substances are measured during the quantitative phase.
In quantitative analysis, two key measurements are made: the sample quantity and a property proportional to the amount of the analyte (the substance being analyzed). This forms the basis of the...
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The receptor occupancy theory connects a drug's response to the number of occupied receptors. With higher drug concentrations, more receptors are occupied, leading to increased responses. The formation of drug-receptor complexes involves association and dissociation rates, which reach equilibrium when the forward and backward reactions are equal. The equilibrium association constant (Ka) and its inverse, the equilibrium dissociation constant (Kd), indicate drug affinity. Higher Ka and lower...
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Assessment of the Mouth01:26

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The two sources for collecting information are primary and secondary. After gathering information, interpretation and validation help to complete the data. The purpose of assessment is to establish data with the initial information, to interpret data about the patient's perceived needs and health problems, and to respond to these problems identified.
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Assessment of the Rectum and Anus01:25

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Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
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Related Experiment Video

Updated: Feb 5, 2026

Analysis of the Ambient Particulate Matter-induced Chromosomal Aberrations Using an In Vitro System
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Quantitative assessment of aberrant

Jie Ruan1, Peipei Xu2,3, Wei Fan4

  • 1Key Laboratory for Medical Molecular Diagnostics of Guangdong, Guangdong Medical University, Dongguan, Guangdong, 523808, China.

Cancer Management and Research
|September 15, 2018
PubMed
Summary

P16INK4a promoter methylation is more frequent in ovarian cancer tissues than normal tissues. This epigenetic alteration may help distinguish cancer from healthy tissue and predict poorer patient prognosis.

Keywords:
P16INK4a promoter methylationTCGA datasetsmeta-analysisovarian cancer

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Area of Science:

  • Oncology
  • Epigenetics
  • Molecular Biology

Background:

  • Epigenetic alterations, specifically P16INK4a methylation, are implicated in cancer initiation.
  • The precise role of P16INK4a promoter methylation in ovarian cancer remains debated.
  • Ovarian cancer diagnosis and prognosis require further molecular markers.

Purpose of the Study:

  • To conduct a meta-analysis investigating the association between P16INK4a promoter methylation and ovarian cancer.
  • To evaluate the diagnostic and prognostic significance of P16INK4a methylation in ovarian cancer.

Main Methods:

  • Meta-analysis of 24 studies examining P16INK4a methylation in ovarian cancer risk, clinicopathological features, and prognosis.
  • Analysis of The Cancer Genome Atlas (TCGA) datasets for CpG site methylation levels.
  • Statistical evaluation using odds ratios (OR) and hazard ratios (HR) with confidence intervals (CI).

Main Results:

  • P16INK4a methylation was significantly higher in cancer tissues compared to normal and low malignant potential tissues (OR=5.01, OR=1.88).
  • No strong correlation was found between P16INK4a methylation and clinicopathological factors like age, stage, or differentiation.
  • P16INK4a methylation was associated with shorter progression-free survival (HR=1.68 univariate, HR=1.55 multivariate).
  • TCGA data confirmed increased methylation at most CpG sites in ovarian tumors.

Conclusions:

  • P16INK4a promoter methylation can differentiate malignant ovarian cancer from normal tissues.
  • P16INK4a methylation serves as a potential predictive biomarker for ovarian cancer prognosis.
  • Further research into P16INK4a methylation's role in ovarian cancer is warranted.