Pacific Edge: Nearing broad adoption
Pacific Edge develops and commercialises molecular tests for the detection and better management of urothelial cancers (UC) and is the only company worldwide to offer multiple molecular diagnostic tests for bladder cancer. The company has created a franchise of products that can be commercialised through the same channels under the Cxbladder banner to meet a series of unmet needs along the same clinical pathway. The underlying aims are to meet the clinical needs of urologists, notably a reduction in the length of current, repetitive and invasive diagnostic testing for UC, and an improvement in accuracy over those tests currently in the market. The first test in the range, Cxbladder Detect, has been shown in clinical studies to be more accurate than benchmark tests at all stages and grades.
Pacific Edge is working towards fully commercialising its bladder cancer testing, reporting a steady increase in volumes from existing customers in recent quarters, albeit off a low base and including healthcare organisations’ testing through User Programmes. A number of these User Programmes are under way in the US, most notably a large-scale testing by Kaiser Permanente. In Singapore, the first User Programme at Tan Tock Seng Hospital is trialling the potential for Cxbladder products in South-East Asia (SEA) for patients needing testing for bladder cancer as well as those coming to SEA for routine medical check-ups. Sales in the smaller New Zealand market are building slowly. A third product, Cxbladder Monitor, was launched in NZ at the end of FY16. In Australia, Pacific Edge recently entered into a new commercial partnership with Tolmar Australia to drive sales forwards after ending its agreement with Healthscope earlier this year.
Exhibit 1: Pacific Edge upcoming newsflow – Cxbladder franchise
Event |
Timing (calendar year) |
Cxbladder Monitor launch in US |
Mid-2016 |
Cxbladder Predict launch in New Zealand |
H216 |
Completion of Kaiser Permanente User Programme |
End-2016 |
Expansion in South-East Asia |
2016/2017 |
Source: Edison Investment Research
Suite of tests offers one-stop-shop to detect and manage bladder cancer
Pacific Edge’s first product, Cxbladder Detect, is regulated in the US as a laboratory-developed test that can be used for detecting bladder cancer in patients who present with haematuria in conjunction with standard urological work-up, a patient population of around seven million annually in the US. The Cxbladder technology is gene based and can be used as a non-invasive adjunct to cystoscopy or to replace other urine-based tests to identify more accurately those patients who should go on for more invasive testing. It is more accurate, faster, less invasive and more cost-effective than standard methods that include cytology, NMP22 BladderChek (Alere) and NMP22 ELISA (Fisher Scientific). Cxbladder Detect quantitatively measures the expression of five mRNA biomarkers in a small sample of the patient’s urine that has been collected non-invasively. Pacific Edge has developed a set of algorithms that combine cancer biomarkers into a single score to detect and characterise bladder cancer. The urine sample is screened using a quantitative polymerase chain reaction validation, a process that amplifies a small RNA sample. This system indicates a score-based probability of urothelial carcinoma: 0-0.12 normal; 0.12-0.23 elevated; and 0.23-1.0 high based on gene expression.
Its next product, Cxbladder Triage, was first launched in New Zealand in December 2014 and targets physicians in the primary and secondary care of patients who present with haematuria in New Zealand and Australia and urologists in the United States. Cxbladder Triage includes the same five genomic biomarkers as Cxbladder Detect adding four phenotypic variables to give a new algorithm. Cxbladder Triage is used to rule out cancer by its high sensitivity and high negative predictive value. Notably, the company recently announced that the Canterbury District Health Board (CDHB) in New Zealand has agreed to replace cytology with Cxbladder Triage. Follow on tests Cxbladder Monitor and Cxbladder Predict are aimed at different value propositions in the evaluation and monitoring of UCs detailed below.
Exhibit 2: Summary of the Cxbladder pipeline
Product name |
Function |
Status |
Notes |
Cxbladder Detect |
Detects bladder cancer in patients with haematuria. |
Commercially available in NZ, Australia and the US since 2013. |
Non-invasive laboratory test for the detection of bladder cancer. Adjunct to cystoscopy. |
Cxbladder Triage |
Segregates patients without bladder cancer. |
Commercially available in NZ (2014), Australia and the US (2015). |
High sensitivity and high negative predictive value. |
Cxbladder Monitor |
Ongoing monitoring to check for recurrence of bladder cancer. |
Commercially available in NZ (2015); slated for US launch in 2016 and other markets in 2016/17. |
High sensitivity and high negative predictive value to determine patients who should receive follow-up tests. |
Cxbladder Predict |
Classifies tumours as low or high grade. |
Expected launch in NZ in 2016. |
Prognostic test. |
Bladder cancer is the sixth most common cancer worldwide and has the highest per patient medical cost of any cancer. There will be an estimated 77,000 new cases diagnosed in the US in 2016. Haematuria can be continuous or intermittent and either visible (gross) or microscopic. Screening studies have shown that in up to 20% of cases of gross haematuria, patients go on to be diagnosed with UC, while only 5% of cases of microscopic haematuria turn out to be UCs, such that the 2001 American Urological Association (AUA) Best Practice Policy on Asymptomatic Microscopic Haematuria recommends that all patients presenting with gross haematuria, particularly those without evidence of infections, should undergo a full urologic work-up. This procedure includes provision of a urine sample for testing with cytology (manual examination under a microscope) in conjunction with cystoscopy (insertion of a flexible scope into the urinary tract). Some patients are also examined by means of upper tract imaging, typically with a CT scan or ultrasound imaging. Cytology tends to have low sensitivity (true positives), particularly at the earlier stages of cancer, and is subject to user variability.
Cxbladder Detect is clinically validated by a multicentre clinical study in 485 patients in Australasia, which compared the test to the benchmark urine tests. Pacific Edge has also completed a further blinded user study in 178 patients, which showed an equivalent rate of performance. Voided urine samples were analysed using Cxbladder, NMP22 ELISA and NMP22 BladderChek, and urine cytology and sensitivity (true positives) and specificity (true negatives) compared to cystoscopy as a reference.
Exhibit 3: Sensitivity of urine detection tests in multicentre clinical study of 485 patients
Tumour stage |
Cxbladderdetect |
Cytology |
NMP22 BladderChek |
NMP22 ELISA |
Tis |
100% |
100% |
0% |
0% |
Ta |
68% |
35% |
38% |
35% |
T1 |
100% |
69% |
50% |
75% |
T2 |
100% |
100% |
22% |
67% |
T3 |
100% |
100% |
50% |
100% |
High grade tumours |
97% |
83% |
38% |
69% |
Upper tract tumours |
100% |
50% |
0% |
75% |
Overall sensitivity |
82% |
56% |
38% |
50% |
Specificity |
85% |
96% |
96% |
88% |
Source: Pacific Edge trial published in Journal of Urology, Vol 188, 741-747
The study showed Cxbladder Detect to be more accurate than cytology and NMP22 tests across all stages and grades at a pre-specified specificity of 85% including stage Ta, which is a potential advantage given the low sensitivity of other tests for early-stage bladder cancer. Pacific Edge also completed an independent clinical validation of Cxbladder Detect in 178 patients in a New Zealand-based user performance study, which showed equivalent performance to that seen in the published clinical study. Furthermore, Cxbladder Detect identified five UCs that had not been diagnosed by cystoscopy, but were subsequently confirmed in a 12-month follow-up. The results were published in the International Journal of Urology in September 2012.
Cxbladder Detect also compares favourably against Abbott’s UroVysion looking at separate large-scale clinical trials, each with over 400 patients. UroVysion was launched 2001 as an aid in monitoring bladder cancer and in 2005 to aid diagnosis. The test uses Abbott’s FISH fluorescence technology to detect chromosomal abnormalities. In a trial conducted by Abbott, UroVysion showed an overall sensitivity of 68.6% and specificity of 77.7% in detecting bladder cancer in 479 patients presenting with haematuria. This compared with a sensitivity of 82% and specificity of 85% for Cxbladder Detect in the separate study detailed above. We note some caution must be used with the comparisons given tests were not compared head to head.
There are a number of commercially available in-vitro diagnostic (IVD) tests to detect bladder cancer in haematuria patients, although the specificity and sensitivity of such tests is variable. NMP22 has been widely adopted as an adjunct to cytology. However, no other test is being used as standard, as none has been shown to be more accurate than the existing benchmark.
Exhibit 4: Landscape of approved IVD tests to detect bladder cancer with haematuria
Test/distributor |
Methodology |
Advantages |
Limitations |
Notes |
UroVysion/Abbott |
FISH fluorescence in situ hybridisation assay – detects chromosomal abnormalities. |
Higher sensitivity than cytology across all stages and grades. |
Requires a large specimen sample. Poor positive predictive value. |
Detects bladder cancer in voided urine sample in cases of gross and micro haematuria and in patients with a history of bladder cancer. |
NMP22 ELISA |
Measures levels of protein NMP22, which is elevated in bladder cancer sufferers. |
Higher sensitivity than cytology for grade I/II. |
Low specificity – interference from benign urinary tract conditions. |
Has not been adopted for standard use in urologic work-up. |
NMP22 BladderChek |
Point-of-care (POC) test with 30-minute turnaround. |
Improves detection vs cytology in cases of recurrent cancer. |
Relatively high rate of false positives. |
Improves accuracy in combination with cystoscopy, but will not replace it. |
BTA Stat/Polymedco |
POC, detects human complement factor H-related protein. |
Immediate result. |
High rate of false positive results in cases of co-existing genitourinary conditions. |
FDA approved for monitoring bladder cancer in conjunction with cystoscopy. |
BTA Trak/Polymedco |
Lab-based immunoassay. |
Higher sensitivity than cytology for low-grade tumours. |
High rate of false positive results in cases of co-existing genitourinary conditions. |
Used for monitoring rather than for diagnosis – high rate of false positives. |
ImmunoCyt |
Lab-based immunofluorescence assay. |
Relatively high sensitivity in some patient groups. |
High rate of false positive results in cases of co-existing genitourinary conditions. |
Approved for monitoring bladder cancer in conjunction with cystoscopy. |
UBC/IDL Biotech |
Measures soluble fragments of cytokeratins 8 and 18. Cytokeratins are characteristic of epithelial cells. |
More accurate at detecting CIS than cytology. |
Overall performance not superior to cytology. Ongoing testing. |
Available as UBC ELISA (2 hr test) and UBC IRMA (POC). |
Source: Edison Investment Research
There are a number diagnostics tests in the market in development for detecting and monitoring UCs, underpinning the attractive opportunity. All are in early stages of development and none, as yet, has shown equivalent or better overall accuracy. Given the long lead time for the commercialisation of UC tests, which can span a number of years, we believe that Pacific Edge has a considerable leg-up on would-be competitors.
The Cxbladder portfolio is being developed as laboratory-developed tests (LDTs). The CMS regulates clinical laboratories that carry out diagnostic testing through the authority of CLIA (Clinical Laboratory Improvement Amendments), which establishes quality standards for clinical lab testing and a certification programme for labs that perform testing using IVD devices. The company has also received the CAP (College of American Pathologists) signification approval in the US. Pacific Edge management continues to explore the pathway to full FDA approval for the Cxbladder portfolio, which would enable the company to directly market to consumers. However, CLIA certification is sufficient for direct selling to physicians given the tests are processed in the company’s own lab.
Pacific Edge management intends to focus on bladder cancer diagnostics in the short to medium term. Further out, the company may pursue other portfolio opportunities that include gastric, colorectal and endometrial cancers and melanoma. However, the company plans to first focus on building on the current momentum of the Cxbladder products and franchise.