Hi John,
I must disagree with your statements, but only as with respect to Ocata (formerly Advanced Cell Technology).
comment if you think, that it is not as good as it sounds
Some issues with all of the above:
- The phrase "stem cells" is not defined and used with variable meaning (bait-and-switch tactics). Often it refers to a thing that would have been called a "plain old cell" 15 years ago.
- Not all of the above studies even claim to use stem cells
- Few of them try to claim clinical efficacy
- Those that do claim efficacy aren't designed to attribute whatever (semblance of) efficacy they claim to any particular cell type, as opposed to structural aspects of the intervention, like surgery, or scaffolding
- Small study size, usually N = 1
- When N > 1, no controls are included in the experiment
- No historical controls are reported, such as spontaneous improvement rates, or availability and success rate of state of the art treatment.
- Generally no mechanistic studies -- efficacy in a vacuum. If cells are transplanted, do they persist? If they're endogenous, what are they doing differently?
- ACTC is among the more advanced. But it's still a phase2a thing. If this was a regular drug, the chance of these claims to hold up in phase3 would be between negligible and zero... (Feuerstein-Ratain rule)
The only therapy I know of that use narrowly defined stem cells that's used on large scale, where the cells persist, and can be demonstrated to underlie the clinical mechanism of efficacy, is in bone-marrow transplantation, for reconstitution after lethal-dose chemotherapy, or correction of genetic diseases (there were some sickle cell links above). Anything else is just fancy headlines that leave the scientific method far behind as far as I can see.
So in the spirit of the OP, stem cells are certainly being used a lot (as far as people bother to define what a "stem cell" is at all). But there are hardly any scientific experiments to be found that demonstrate them to work as advertised by the grant writers and penny stock pushers. There's nothing remotely like evidence of efficacy to the same standard that drugs are being held to.
1).- The phrase "stem cells" is not defined and used with variable meaning (bait-and-switch tactics). Often it refers to a thing that would have been called a "plain old cell" 15 years ago.
Correction:
Stem Cell and Embryonic Stem Cell and all derivatives are clearly defined by Ocata, Ocata's Chief Scientific Officer, Chief medical officer, and distinguished advisors.
Please see some of Ocata's peer reviewed prestigious publications: https://www.ocata.co...ientific-papers
Furthermore: Per Ocata's Chief Scientific Officer's curriculum vitae:
Dr. Lanza has hundreds of publications and inventions, and over 30 scientific books, including “Principles of Tissue Engineering” and “Essentials of Stem Cell Biology,” which are considered the definitive references in the field.
2)Not all of the above studies even claim to use stem cells
Please review:
https://www.ocata.co...peline-overview
https://www.ocata.co...dicine-programs
https://www.ocata.co...clinical-trials
- Few of them try to claim clinical efficacy
"...today confirmed that the vision of a patient enrolled in a clinical investigation of the company’s retinal pigment epithelial (RPE) cells derived from human embryonic stem cells (hESCs) has improved from 20/400 to 20/40 following treatment." “We continue to be encouraged by the progress we see in our ongoing clinical investigations, though the results included in the article were confidential and not intended for publication at that time,” commented Gary Rabin, chairman and CEO of ACT. “Our plan is still to publish additional results from the clinical investigations when we have a significant aggregation of data.”
http://ir.ocata.com/...wed-improvement
The Lancet Peer Review Publication: See Lancet, Ocata website, or google.
Human embryonic stem cell-derived retinal pigment epithelium in patients with age-related macular degeneration and Stargardt’s macular dystrophy: follow-up of two open-label phase 1/2 studies
Those that do claim efficacy aren't designed to attribute whatever (semblance of) efficacy they claim to any particular cell type, as opposed to structural aspects of the intervention, like surgery, or scaffolding
Retinal pigment epithelium cells derived from human embryonic stem cells. Very well defined. Please see material in the above references for further study.
3)The only therapy I know of that use narrowly defined stem cells that's used on large scale, where the cells persist, and can be demonstrated to underlie the clinical mechanism of efficacy, is in bone-marrow transplantation, for reconstitution after lethal-dose chemotherapy, or correction of genetic diseases (there were some sickle cell links above). Anything else is just fancy headlines that leave the scientific method far behind as far as I can see.
So in the spirit of the OP, stem cells are certainly being used a lot (as far as people bother to define what a "stem cell" is at all). But there are hardly any scientific experiments to be found that demonstrate them to work as advertised by the grant writers and penny stock pushers. There's nothing remotely like evidence of efficacy to the same standard that drugs are being held to.
Correction.
The information provided above with respect to Ocata's work precisely shows safety as well as efficacy, 4 years worth!
No worries. There are lots of companies out there doing their best to make headway in cell therapy. Ocata is the needle in the haystack.