Maybe the hypertumor gets it's own tumor after a while, and the cycle continues. Or the immune system of the whale which doesn't react to the original tumor doe

Maybe the hypertumor gets it's own tumor after a while, and the cycle continues. Or the immune system of the whale which doesn't react to the original tumor does react to the hypertumor. Or maybe the hypertumor only grows on the original tumors type of tissue. Etc. This article is just about a hypothesis. It's anyones guess at the moment.