Quartet Test Multicolor FISH for Bladder Cancer Detection
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Solution Overview
Problem
Current non-invasive detection methods for bladder cancer, such as FISH tests, have insufficient sensitivity and specificity, leading to the need for invasive procedures to confirm the absence of bladder cancer, and there is a lack of effective methods for monitoring the disease's progression and response to therapy.
Innovation Solution
A multicolor fluorescence in situ hybridization (FISH) test, known as the Quartet Test, using locus-specific probes for chromosomal regions 6p22, 8q22, 11q13, and 20p11.2, which are hybridized to nucleic acids in biological samples, including voided urine, to detect abnormal copy numbers indicative of bladder cancer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If current FISH tests using centromeric probes are used for bladder cancer detection, then the test can be performed non-invasively on voided urine samples, but the sensitivity and specificity are insufficient to eliminate the need for invasive cystoscopy and tissue biopsy
Solution Approach 1:
The patent changes the target parameters from centromeric regions to specific chromosomal loci (6p22, 8q22, 11q13, 20p11.2) that are frequently amplified in bladder cancer. This parameter change in probe targeting increases both sensitivity (78.6%) and specificity (93.8%) while maintaining the non-invasive nature of urine-based testing
Solution Approach 2:
The patent uses a composite approach by combining multiple locus-specific probes (four different chromosomal regions) into a single FISH test panel. This composite probe design allows simultaneous detection of multiple cancer-associated amplifications, achieving high diagnostic accuracy while remaining non-invasive
2Measurement precision
If multiple alternative combinations of diagnostic probes are selected based on recent genomic analyses, then the diagnostic performance can be enhanced, but the device complexity increases
Solution Approach 1:
The patent segments the diagnostic task by dividing it into four distinct chromosomal locus targets (6p22, 8q22, 11q13, 20p11.2), each with its specific probe. This segmentation allows systematic evaluation of different probe combinations and enables selection of the optimal set based on genomic data, achieving high diagnostic performance through structured complexity management
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The Quartet Test achieves high sensitivity (78.6%) and specificity (93.8%) in detecting bladder cancer and predicting tumor grade, reducing the need for invasive procedures and improving monitoring of disease progression and therapy response.
Implementation Method 1
hybridizing the set of locus-specific probes to a plurality of nucleic acids; and analyzing the hybridization pattern
Implementation Method 2
multicolor fluorescence in situ hybridization (FISH) test, known as the Quartet Test, using locus-specific probes for chromosomal regions
Data Source
AI summary
The present disclosure provides methods and compositions for the detection of bladder in a subject using four locus-specific probes to 6p22, 8q22, 11q13, and 20p11.2.