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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
Such kits are not currently available and would certainly be a breakthrough! The difficulty in producing these kits is fundamental to the fact that blood tests are not effective at diagnosing cancers, by far the most common method is biopsy of suspected cancerous tissue. If you have more specific questions I would be happy to help.
In reply to point 1: I would have concerns diagnosing neoplasia on the basis of a test with only 85% sensitivity and 80% specificity. In these cases we can be making significant decisions based on these results. A common "snap test" kit we use in the UK for FeLV/FIV viruses in cats has sensitivity of 98.6% and specificity of 98.2% and we still often confirm results if we are making significant decisions based on these results. The test you describe may be useful as a screening test, however a positive result would still need to be confirmed with a biopsy. So in answer to your question, I do not think that test alone is effective enough to convince vets and owners of the results it provides. If the test does not identify the type of neoplasia, then I also think it will be of limited use. We often have suspicions of neoplasia from our clinical exam, then its a case of trying to find out where the problem is. The potential use of your proposed test would more likely be if a mass were identified, and getting an idea of whether the mass is neoplastic. However in these situations, the diagnostics are much more straightforward. The situation where a test such as yours would be a game changer would be for animals with vague clinical signs, that we suspect may involve neoplasia, but without a readily identifiable source. In the situations where we are on a "tumour hunt" a test such as your would be revolutionary, but it would need to identify the the type of tumour, or at least what organ system it is associated with.
Point 2: I am in the UK rather than the US, but costs here are relatively in line with the US after currency conversion. In my practice a surgical biopsy would be in the region of £3-400/$4-500 for a readily accessible tumour. These costs are usually covered by pet insurance policies, yes.