Overview Of Canopus Circulating Tumor Cell Platform Technology
Our Patented CTC (Circulating Tumor Cell) technology is an enabling platform technology for the recovery
and analysis of disseminated cancer cells in peripheral blood. Capitalizing on recent advances in disease
marker discovery, single cell analysis, and patient-specific therapeutics our CTC technology provides a high
sensitivity, high specificity, repeatable, reproducible, and non-invasive diagnostic assay for guiding
treatment decisions and improved patient triage.
Clinical research on a range of cancer types has demonstrated that the presence and number of CTCs is a
useful diagnostic indicator of metastatic potential. Recent literature suggests that tumor cells may
disseminate in a far less progressed genomic state than what was previously thought, only later acquiring
genomic aberrations typical of metastatic cells. The early detection followed by early treatment of cancer
equates to an improved survival and decreased morbidity. Our CTC technology when combined with
immunochemical staining for disease-specific markers provides a powerful diagnostic indicator for
patient-tailored treatment. An example is the detection of Her2neu over-expression indicating an
aggressive but potentially treatable form of breast cancer.
Moreover, the Canopus CTC technology can be applied to treatment monitoring by repeat sampling and
enumeration of the CTC burden in patient blood samples.
Benefits of Our Technology
The CTC technology produces an enriched specimen that maintains cell morphology and is compatible with
any immunocytochemical staining technique. It can also be coupled with complementary technologies,
leveraging recent advances made in disease marker discovery, single cell analysis, and patient-specific
therapeutics. Currently, Canopus has demonstrated effectiveness with non-specific cancer markers and
with markers specific to breast cells. This enabling technology bridges a crucial gap between patient-
specific disease etiology and patient-tailored treatment options.
- High sensitivity (greater than 80% tumor cell recovery based on cell seeding studies)
- Minimally invasive to the patient, requiring only a small 4 ml blood sample
- High specificity (no false positives)
- Compatible with both slide-based cytochemical detection and single cell molecular analysis
- No false positives
- Gives a quantitative and readily visible result suitable for automated or manual review
- Low cost per test
- Amenable to automation for test reproducibility
Limitations of Alternative Technologies
Molecular diagnostic products have limitations that restrict their widespread market
- Complex procedures that are difficult to automate, require highly trained lab technicians and
- High cost – expensive diagnostic kit and high labor cost
- Low and irreproducible recovery
- Prohibitively long running time; not scalable to larger volumes ( common problems with micro chip
- Detection technologies that rely on immuno-based selection are limited by the complex blood matrix
that can sequester and remove CTCs
- Blood proteins are known to coat cancer cells in circulation preventing recognition by immuno-based
- Molecular analysis for CTCs in non-enriched mononuclear cell fractions is often associated with
increased false positive results
The push to develop targeted therapies is the most notable trend in oncology since the introduction of cell-
killing treatments. A significant number of cell-specific and patient-specific therapies have reached late-
phase trials and have even been marketed (e.g. Gleevec® and Herceptin®), raising expectations that
similar treatments can play a major role in cancer care. However, major challenges remain in target
definition and patient selection. To address these challenges, many targeted drugs will require cell-specific
biomarker-based diagnostic tests. Consequently, it is anticipated that the theranostic market, or
therapeutics coupled to specific diagnostic tests, will achieve significant growth in the coming years.
Recently Veridex a J&J company received a 510k for what in the past was considered by FDA to be a Class
III device. This has significantly reduced the cost of entry into the market! The resulting test for the
management of metastatic breast cancer is estimated to have a $300 million per year market value.
In general, any tumor types that disseminate cells into the bloodstream are good candidates for both
detection and disease monitoring. These include breast cancer, malignant melanoma, prostate cancer,
lung cancer, gastrointestinal cancers and pancreatic cancer.
Of special interest:
- Cancers that are hard to detect by conventional diagnostic examination and imaging techniques (e.
g. pancreatic cancer)
- Diseases associated with high-risk populations (e.g. smokers, hereditary mutations in BrCa1/2,
- Cancers that often display multi-drug resistance during disease management
- Lung cancer because of the difficulty of obtaining an adequate sputum sample
- Cervical cancer because of examination discomfort
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