On this topic when I was an academic a few years ago I had one of my undergraduate student project groups go through an entire year of Cancer Research (one of the highest ranked cancer journals) from 10 years previously and have them find out what happened to the work published. Rather depressingly the vast majority went nowhere and when my students contacted the PIs to find out why most of the time it was for totally non-scientific reasons like the group lost funding or someone left.
This isn't mutually exclusive to the treatment being in the public domain.
Of course if you wanted to you could make this treatment yourself - it is not that complex.
For every therapeutic target there are many chemical/biological solutions that can work. If an off-patent compound shows some effect in a pathway, a patentable variant can usually be made.
But to address your specific question, generics are drugs that come onto the market all of the time without patent protection.
According to the paper, these were the two drugs used:
* "CpG SD-101 was provided by Dynavax Technologies"
* "Fc-silent Anti-OX40 (CD134) mAb was purchased from Absolute Antibody"
SD-101 is already in clinical trials. http://www.dynavax.com/our-pipeline/cancer-immunotherapy/sd1... The anti-OX40 was a laboratory antibody, presumably as this was for a study in mice. However, there are various anti-OX-40 molecules in clinical trials, which could be used.
To get clinical trials going with this approach isn't a matter of patents - it's a matter of one or two companies (depending on ownership of suitable molecules) deciding its something they want to do, and then doing it. My guess is that Dynavax will already be exploring this.
This type of research tends to be publicly funded. However, that doesn't prevent it from being privately patented because of the https://en.wikipedia.org/wiki/Bayh-Dole_Act
Also by definition a patent is in the pubic domain (for knowledge) and the publication is of course a public disclosure.
Also for clarity (and responding to the concerns of the original questioner) it's highly unlikely that this combination will be patented by anyone - this isn't how patents are used in drug development. Anyone with access to the necessary drugs would --in theory-- be free to open a clinical trial to test this approach.
well... you can write a patent that is so obfuscated that the public cannot learn from it...
In such case the patent office should reject your patent claim as patent laws usually require that the description of the invention being patented should be understandable to professionals of relevant domain, who should be able to replicate it based solely on that description.
While this does happen, and sometimes things obvious to a practitioner get patented, obfuscated patents are contrary to the purpose of patenting.