Dr Boreham’s Crucible: Rhythm Biosciences is ready to trial its hands-off poo test
Health & Biotech
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On reaching the age of 50, Australians can expect a thoughtful gift in the mail from Canberra’s health poo-reaucracy: an invitation to provide a stool sample to screen against bowel (colon and rectal) cancer.
Formally known as a faecal immunochemical test, or FIT, the diagnosis is an unwieldy seven-stage process of harpooning the stool in the toilet pan, gently swabbing it, inserting it in the sample vial provided, doing the paperwork (twice) and then sending it back to the laboratory within two days.
Popping the sample in a post box ahead of a stinking hot long weekend is not advisable. Oh, and the procedure has to be repeated for a second sample the next day.
For “personal or cultural” reasons, only a minority of this high-risk target group (that is, older people) avails of the free invitation. That’s a pity, because there’s a 90 per cent chance of successful intervention if these cancers are detected early.
The test, however only detects blood in the stool rather than more definitive bowel cancer biomarkers.
But what if there were a better way?
Deploying know-how devised by the CSIRO, Rhythm is developing a non-invasive blood-based test called Colostat. If successful, the diagnostic could replace both the poo tests and – in many cases – follow-up colonoscopies.
“The CSIRO had the test for 15 years but in typical CSIRO fashion hadn’t done anything with it,” says Rhythm chairman Shane Tanner.
With ‘only’ four per cent of colonoscopies proving positive, hospitals with limited endoscopic facilities need to be careful how they allocate their resources.
Thus, the test could also be used a ‘triage’ method to prioritise patients with a positive stool test for a follow-up colonoscopy.
Rhythm’s Colostat is an easier and simpler test than the almost-related company, Clinical Genomics, which markets the specialist and more complex Colvera blood test.
(Rhythm founder Dr Trevor Lockett was with CSIRO when it assisted Clinical Genomics founder Dr Larry LaPointe to develop Colvera.)
Dr Lockett says his test is better suited to screening.
The Colostat test remains unapproved and in development.
But if successfully commercialised, Rhythm will be tapping a capacious market. In Western countries, 118 million tests valued at $5.9 billion are done annually.
The US has a similar bowel cancer screening program to Australia, while 14 European Union countries also provide a universal test.
Participation rates are 62.6 per cent in the US, 46.9 per cent in Australia and a niggardly 38.2 per cent in Europe.
(Your columnist’s totally unproven theory about the superior US participation rate is if the country’s miserly health system throws you a freebie, you will avail of it.)
Rhythm cites the targeted populace of 250 million 50 to 75-year-olds. But with an average of 52 per cent not participating, the unscreened market (132 million tests) is worth another $6.6 billion.
A series of six small-sized patient studies carried out by the CSIRO since 2005 shows the precursor test to Colostat was accurate in 73 per cent of total diagnoses, compared with 65 per cent for FIT tests.
At stage one (early) cancer, the comparison was 58 per cent versus 53 per cent.
A rare case, one could say, of the rhythm method being superior.
For the last year or so, the Rhythm story has been a somewhat soporific one of isolating the antibodies and proteins to develop the reagents to identify the relevant biomarkers.
With mission accomplished, the boffins have turned to scale-up manufacturing and “assay optimisation”.
Rhythm hopes to include up to 10 biomarkers in the test, but the CSIRO has advised that four would give just as good a result.
“We are trying to come up with something that meets everybody’s needs,” says CEO Glenn Gilbert.
In April, the first patient was recruited for a 1,000-patient clinical trial, to be overseen by principal investigator Prof Rajvinder Singh of Adelaide’s Lyell McEwin Hospital.
The trial involves 1,000 volunteers taking the Colostat test, the poo test and undertaking a colonoscopy. Their reward for the ordeal? A fistful of dollars and the warm feeling that they are advancing medical science.
With the first results expected by the end of 2019, the trial will be used to support a marketing application to European authorities and the Australian regulator, the Therapeutic Goods Administration.
The hospital’s director of gastroenterology, Prof Rajvinder is a global expert on endoscopic imaging and treatment techniques for colorectal cancers.
The trial will test Colostat’s efficacy relative to colonoscopy in detecting colorectal cancers and advanced adenomas (benign tumors). The study will also have “related comparisons” to FIT tests.
“Surgical interventions for colorectal cancer are much more effective when the cancers are detected at an early stage when they can be removed during a colonoscopy procedure,” Prof Rajvinder says.
“There is a real need for inexpensive, minimally invasive screening tests that will attract the public.”
Rhythm listed on December 7, 2017, having raised $9 million at 20 cents apiece.
With cash of $5.64 million, management expects to have enough in the bank to get to European and TGA regulatory approval stage.
Given the company has been in the boring-but-important stage of reagent development, the shares are at the lower end of the 12-month price range of 13 cents (October 2018) and 34 cents (just after listing).
The Perth based Merchant Opportunities Fund has keenly supported the stock, having boosted its stake from 5.0 per cent at listing to 8.1 per cent.
The key to Colostat’s success is not necessarily enhanced accuracy, but cost and ease of use (eliminating the ‘faecal fear factor’).
While the obvious market is government, health insurers – including the biggest – Medibank Private and Bupa are keen.
“A test at 70 per cent efficacy would also be worth $500 million to a Roche or a Merck,” Mr Tanner says.
Mr Tanner says there are lots of blood tests, but they are costly.
“We are hoping to come in at $30 to $40 per test,” he says.
“We believe the poo tests costs about $150 each to administer. So, if we can come in a third of that it’s a big win.”
Globally, 850,000 people die of bowel cancer each year and it’s the third most prevalent cancer for the world, and the second most common in Western countries, where diets aren’t getting any better.
From a wide-eyed investor perspective, the question is what alternative new tests are in the pipeline – and in this regard Rhythm is not on its Pat Malone.
Rhythm acknowledges Novigenix’s Colox and the Sydney and New Jersey-based Clinical Genomics’ Colvera at the “high cost” molecular testing end (that is, the traditional tests). Clinical Genomics also has its Insure One faecal immunochemical test.
But in the ‘low cost’ protein-based end, the Belgian-based, New York Stock Exchange-listed Volition Rx is developing Nu Q, a blood test for bowel and lung cancers.
The test identifies nucleosomes, which are DNA segments overexpressed in the presence of cancer. Volition is rooting for regulatory approval around 2020, a similar time line to Rhythm.
But as well as being more expensive, the test requires three blood samples rather than one for Colostat.
Given the aim of Colostat is to introduce low cost simplicity as much as more accuracy, maybe there’s room for more than one.
Volition bears a market valuation of $US130 million ($160 million) compared with Rhythm’s $17.6 million, which implies the latter is a value bet on successful commercialisation.
In the meantime, expect a more commercial focus from the board now that most of the boffiney laboratory work has been done.
In November last year, CEO and 35-year CSIRO veteran Dr Trevor Lockett was “transitioned” to the role of technical director in favor of Mr Gilbert, then the company’s chief operating officer.
Mr Gilbert has a sales and marketing background, having worked in senior roles at Medical Developments and CSL Biotherapeutics (now Seqirus).
This column first appeared in Biotech Daily.
Disclosure: Dr Boreham is not a qualified medical practitioner and does not possess a doctorate of any sort. But you don’t need a Ph D to take the poo test – although it could be handy for the paperwork (twice).