Some thoughts5 Jan 2024 09:02
As with any Newland rns there is a generous dollop of hype to cover the missing info. A proper clinical study always begins with a section on Patients and Methods. This is missing. How were these patients selected? At what stage in the disease were they? I am guessing that they all had to have CTCs available at venesection because of likely metastatic disease. Only then was AGL able to compare the clinical value of Parsortix derived CTCs wth tumour derived DNA. AGL then comes up with the bleedingly obvious conclusion that Parsortix is of far more value, with appropriate downstream analysis, than ctDNA. A no brainer. Indeed, what clinically useful info does ctDNA provide over and above CTCs? I think the answer is NIL.
This seems to have been an inhouse study aimed at pointing out these differences for commercial consumption. It would not get past a half competent journal referee. BUT ctDNA is essentially a screening test to answer a single question: Could this patient have one of a number of cancers? Parsortix is NOT a screening test. Period. The two investigations have totally different purposes, and I can see no valid reason why they should have been run head to head apart from confirming the unsuitability of ctDNA for useful downstream analysis when compared with gold standard Parsortix.
Having said this, as a LTH I am only too happy to see the SP rise. The rns of 3 days ago describing the collaboration with the Jap. outfit is good news, but also indicates IMHO that at this stage Parsortix remains a clinical research tool rather than a tool with direct clinical application for all patients already diagnosed with a malignancy, but this will surely foĺlow.