When looking at the comments on twiv.tv I see a debate pro vs contra XMRV. In my eyes the contra XMRV side is more trustworthy as well as scientific. I give you one example where the pro XMRV side makes a bad stand:
RRM: "The CC "confirmed" 7 out of 101 samples. Great confirmation."
Gob: "They only tested 11."
RRM: "No, they tested all 101 using that same assay. It's in the addendum to the Science paper: "The remaining 90 samples described in the paper exhibited very few XMRV-gag specific PCR products and no env specific PCR products following single round DNA PCR of DNA of unstimulated PBMCs."And thus:"only 7% of our 101 patients PBMCs exhibit products upon DNA PCR."
Gob: ""XMRV gag sequence. Detection of XMRV was confirmed in 7 of 11 WPI CFS samples at the Cleveland Clinic""
RRM: "Yes. It was confirmed in 7 out of 11 "highly viremic" patients. The other 90 patients were negative, as you can clearly conclude from the quote I've provided.
You understand the addendum is a clarification, right?"
Gob: "They did not test the remaining patients with that assay in Lombardi et al."
Instead of admitting that he (Gob) was wrong with the numbers he switches topic!
RRM: "Who cares if they did it before or after? Fact is that all patients were tested and a whopping 7% was found to be positive using that assay."
And this goes on and on and on. RRM and drosha as far as I can judge this, always win the discussions and they don't seem biased to me.
Some XMRV/PMRV studies have been positive and some have been negative, and researchers are currently looking for more evidence. There is a scientific debate going on about the subject, and it's going to be a long process.
The only reason I get frustrated about the issue is because I read about people saying that XMRV is just contamination, or that XMRV is not a real virus, or that it's a lab artifact, or that there is no association between XMRV and ME, or that XMRV research is not looking good, or that we should forget about XMRV and not worry ourselves about it.
All of these opinions are just unscientific opinions. There is so much that we
don't know about XMRV that it is far too early to draw any conclusions from the tiny bit of research that has been carried out so far.
So it would be very nice if we could be allowed to watch the research unfolding without feeling like we are under attack all of the time from people who seem to wish to close down the subject. Maybe that's not what they are doing, but that's certainly my interpretation, from the strange comments that people like Coffin and Stoye persistently make.
With regards to the addendum, Judy has always said that PCR is the least effective method to detect XMRV. In the addendum the authors state clearly that they used 5 different methods, and that single-round PCR was the least sensitive of the methods used, possibly because of the very low copy numbers of the virus in the blood. So they selected a small cohort of 11 patients to test using this method, who they had observed to have persistent viremia (viremia = virus in the blood), and 7 out of 11 tested positive for gag and env XMRV sequences.
"We included this figure to demonstrate that nested PCR, which inevitably raises questions of contamination, is not essential to detect XMRV in highly viremic ME/CFS patients."
"The remaining 90 samples described in the paper exhibited very few XMRV-gag specific PCR products and no env specific PCR products following single round DNA PCR of DNA of unstimulated PBMCs."
"In contrast, when cDNA was prepared from PBMCs, 67% of the samples exhibited gag products upon nested PCR, though PCR with nested env primers did not result in detectable products from these samples."
"Of the 34 patients whose PBMCs were negative for XMRV by DNA or cDNA PCR, 17 were positive for infectious virus when co-cultured with the LNCaP indicator cell line, as XMRV gag and env PCR products were detected in the cell line following their infection with XMRV from the patient PBMCs"
So when the authors of the negative (zero/zero) studies say they can't detect XMRV by PCR, then it's not really a surprise. Judy Mikovits couldn't either, except for 7 out of the 11 carefully selected patients who were probably extremely ill, and showing signs of viremina. (I don't know the details about the signs.)
It's only by using further techniques, such as nested PCR, stimulated PBMCs, and by culturing the samples, that Judy was able to detect XMRV in most patients.
When the authors of the negative studies say that they did exactly what Judy did, her methodology was very complex and they haven't followed it exactly, and some not even closely.
Here's what the authors of the addendum say about the UK zero/zero studies:
"...very few, if any, of the samples would be expected to be positive by DNA PCR..."
So, unstimulated single round PCR (gag) detected 7% positive XMRV DNA.
Unstimulated nested PCR (gag) detected 21% DNA and 54% cDNA.
Stimulated nested PCR (gag) detected 72% cDNA.
Cultured LNCaP nested (gag) detected 89% cDNA.
I think it's a shame that the addendum wasn't added to the original paper, because I think most XMRV researchers don't seem to have read it, probably because they think they already know how to detect a retrovirus, so why would they need any advice?
Here's the addendum:
http://www.landesbioscience.com/journals/virulence/MikovitisVIRU1-5.pdf