Adaptive EBV cfDNA Thresholds for NPC Screening Accuracy
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Solution Overview
Problem
Existing methods for detecting nasopharyngeal carcinoma (NPC) using Epstein-Barr virus (EBV) cell-free DNA (cfDNA) in plasma are prone to high false positive rates due to variations in EBV cfDNA levels influenced by subject-dependent factors like smoking status and subject-independent factors like ambient temperature.
Innovation Solution
Determine a threshold for EBV cfDNA levels based on attributes such as subject age, smoking status, and ambient temperature to reduce false positive rates by comparing the actual EBV cfDNA levels against these thresholds, potentially followed by a secondary screening using next-generation sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed threshold is used for EBV cfDNA detection, then the screening process is simple, but the false positive rate increases due to variations in EBV cfDNA levels
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed threshold to a dynamic threshold that adapts based on subject attributes (age, smoking status) and environmental factors (ambient temperature). The threshold is no longer static but changes according to the specific conditions of each subject, thereby improving detection accuracy while accounting for natural variations in EBV cfDNA levels.
Solution Approach 2:
The patent implements parameter changes by modifying the threshold parameter based on multiple variables including subject age, smoking status, and ambient temperature. Instead of using a single fixed threshold value, the system adjusts the threshold parameter dynamically according to these changing parameters, which directly addresses the issue of false positives caused by environmental and subject-specific variations.
2Reliability
If subject-dependent factors are considered in threshold determination, then false positive rate decreases, but the complexity of the screening process increases
Solution Approach 1:
The patent applies preliminary action by collecting subject attribute information (age, smoking status) and environmental data (ambient temperature) before performing the EBV cfDNA measurement. This preliminary data collection allows the system to pre-determine an appropriate threshold tailored to the subject's specific conditions, improving accuracy while streamlining the actual detection process.
Solution Approach 2:
The system incorporates feedback mechanisms by using subject attributes and environmental factors to adjust the threshold based on observed correlations. The threshold determination process continuously adapts based on feedback from subject characteristics and ambient conditions, thereby improving screening accuracy while maintaining operational efficiency through automated adjustments.
3Measurement precision
If ambient temperature is used to adjust the threshold, then detection precision improves, but additional measurements and calculations are required
Solution Approach 1:
The patent applies universality by using ambient temperature measurement, which serves multiple functions: it characterizes environmental conditions affecting EBV cfDNA levels, provides input for threshold determination, and can be obtained through standard environmental sensors already present in many testing environments. This multi-functional approach improves measurement precision without significantly increasing system complexity.
Data Source
AI summary
Provided herein are methods, systems, and computer readable medium for detecting nucleic acid from a pathogen, e.g., virus, e.g., Epstein-Barr virus (EBV), in a cell-free nucleic sample from an individual at risk of a condition, e.g., nasopharyngeal carcinoma (NPC). The methods, systems, and computer readable medium can be used to screen for the presence of the condition, e.g., NPC, using thresholds adjusted based on sample attributes.