Recovery Groups in Tox Studies: 4 Mistakes That Cost You Reversibility — Transcript

Full transcript

1. 0:19finding that doesn't reverse, which is most definitely going to be called adverse.
2. 0:47So the first mistake that sponsors make when they add recovery groups,
3. 0:50so the first mistake that sponsors make when they add recovery groups to their
4. 0:54study designs is that they only add them to the control group and the
5. 0:58high ghost group. And this is usually a recommendation from the CRO to reduce
6. 1:02animals and optimize a study, but I've seen it several times before where you
7. 1:07will have findings in the in-life phase, and you can't tell then whether those
8. 1:11findings become reversible. The FDA is definitely going to flag this,
9. 1:15particularly if your NOAEL is the mid or the high dose.
10. 1:18And it's also going to play into the calls and establishment of adversity,
11. 1:21because if you have a finding that is not reversible,
12. 1:24that is more likely to be adverse than a finding that is reversible.
13. 1:27But if you don't have the animals to show reversibility,
14. 1:30then you're not going to know if you're able to establish that sponsors make
15. 1:32is that the recovery duration is too short.
16. 1:36So a lot of times pathology and any other end points that you're using
17. 1:38within these study designs, they have to align between those different animals.
18. 2:00Another mistake the sponsors will make when they add recovery groups is that they'll
19. 2:03treat the recovery animals differently from your main animals.
20. 2:06And so they'll use different sex ratios or different terminal end points.
21. 2:09And this is very common with clinical pathology.
22. 2:12sometimes because you have 10 animals in your main group and
23. 2:16this is very common with clinical pathology animals you might have different time points
24. 2:21in your recovery animals but this is a big no-no.
25. 2:24Remember that your recovery that's still a total of 15 animals per sex total
26. 2:27that's going to be going through the dosing period. So you want to make
27. 2:31sure that your endpoints, anything that you're adding onto the study and your study
28. 2:34design, they align between the different animal groups.
29. 2:39And the final mistake that a lot of duration of recovery will make is
30. 2:42that they don't include TK in the recovery period.
31. 2:44We talked before about how large they have longer half-lifes.
32. 2:49And even for small molecules, they might have longer half-lifes,
33. 2:52too, where you have to show that that drug actually has decreased in concentration,
34. 2:55plasma concentration, over will align for all animals,
35. 2:58and four, your TK will be included throughout Maine,
36. 3:02and four, your TK will be included throughout your
37. 3:10groups as well. For two, your recovery duration will meet or
38. 3:14exceed the several half-life requirement. recovery period will cover several half-lifes.
39. 3:20Three, you will have endpoints aligned for toxicology study design looks like where the
40. 3:24recovery groups are designed And so this is what a good toxicology
41. 3:29design looks like where recovery groups are put in there for a purpose and
42. 3:33where the design looks good. And you're going to be able to make a
43. 3:35thorough toxicology using recovery groups to justify any findings and If And if you want more content like this, check out my course,
44. 3:42The Complete Guide to Non-Clinical Development. There's 12 plus modules, you want to go deeper into study design and how you can optimize it,
45. 3:45plus two bonus modules, three tiers for your experience. you can go to my course, the complete guide to nonclinical development.
46. 3:48The link is in the comments.
47. 3:49It goes through all of this within module four.
48. 3:56If you want to do a deeper dive into study design and recovery groups,
49. 3:59we go through it in my course, the complete guide to nonclinical development.
50. 4:02There's three tiers for every level of what you're looking for,
51. 4:05and we even have a coaching to your where you get me in a
52. 4:08private Slack community and monthly office hours. So check it out if you want
53. 4:11to and I hope you learned something today.