Carcinosin has been a catalyst for a series of remedies. Those remedies have been glandular. Hormones balance from these glands to restore health. Those hormones are responsible for Immunity for the most part.
Carcinosin triggers off the action of glandular remedies like Sepia, Chelidonium, Apis, Strophantus, Hekla Lava, Thuja (to a less extent). Maybe many others - these are the glandular ones I've checked out. And it triggers the action of hormonal remedies like Parotidinum, Thyroidinum, Seratonin and Melatonin. It even helps along worm remedies to clear the bowels.
In the same way, Psorinum must be a trigger of some sort for particular remedies, and other nosodes may trigger off some other set.
I've had no dog heal with either Psorinum or Tuberculinum so I'm leaving them alone for the present.
Syphilinum and Medorrhinum do respond, but not enough that I know where to go with them - I should give them a shot again soon.