Bromelain is also found naturally in pineapples so my morning juice which incidentally tasted fantastic was loaded with bromelain, I have read that bromelain literally strips the mucus coating away from cancer cells allowing your own bodies natural defenses to recognize them as the bad guys and attack and kill them.
I do have to disagree with your comments here. First of all the pineapple fruit is not that high in bromelain. Bromelain is concentrated in the stem of the pineapple, not the fruit.
And bromelain is a protein digestive enzyme. But mucus is primarily composed of polysaccharides, not protein, which means that the bromelain will have very little effect on mucus.
And finally, cancer cells are not coated with mucus. Cancer cells are embryonic tissue. And like the fetus, which is also a foreign protein, cancer cells and fetuses hide from the immune system through a coating of human chorionic gonadotropic hormone HCG). This is why they were looking in to using anti-HCG vaccines to fight cancer about 20 years ago.