John West
Analyst · Kevin DeGeeter from Oppenheimer. Your line is now open
Sure. This is John. So, let's see, our liquid biopsy, first of all is paired together with tissue biopsy. And both liquid and tissue have advantages. And because we have both, that's actually a relatively unusual offering. Many companies that offer liquid biopsy products don't actually have a tissue biopsy product. But the tissue is the only way to see RNA in addition to the DNA, and it's the only way to see the immune cells that have actually infiltrated the tumor. And so having the combination of the tissue and the liquid is an important step. I'd say that in addition to that, the – we have designed our product because it covers the entire exome, it doesn't just see mutations that people might expect because it's intended to be used in pharmaceutical research. Many pharmaceutical companies are interested in understanding when a patient responds to a drug for a period of time, but then eventually stops responding, what changed about the tumor? What were the mechanisms by which the tumor began to escape from the effects of the drug? And so being able to see the new mutations that occur, wherever they are in the genome, where they are in the exome, is really important to them. Most other liquid biopsy products are about 40 times smaller in terms of the number of genes. They look at – they traditionally just look at the cancer driver genes, the targeted therapy genes. And that's fine for – as a diagnostic. But if you're trying to understand the biology of the tumor, which is often the goal in pharmaceutical research, then it's important to be able to see all the biology, not just the, to some extent, the biology that we've known about for decades. So I think that, hopefully, that answers your question on the exome side. In terms of the personalized product, Personalis has designed a variety of tests over the years, both for ourselves and for customers. We have actually become quite expert at that. And so we anticipate that the ability to make personalized assays will be something that will leverage those same skills. So we're pretty optimistic about that. If you think that a key skill in being able to manage that kind of a program is actually the informatics of being able to keep track of it because you have a different assay for every patient and different patients may have different time points and so forth. And so there's a sort of a logistical complexity to all of that, and that's also an area that Personalis has a lot of strength. We've developed a system we call our Symphony system, which keeps track of all the internal informatics of our laboratory and data processing operations, and that's been a fantastic asset for us at this point, and we think it will also help us move quickly to bring these personalized products to market.