Lane has written two books, both with the false claim that sharks don't get cancer in their title.
Sharks do get cancer, even cancer of their cartilage.
Dr. Lane is an example of why alternative medicine is usually either useless or harmful. He took a little bit of knowledge, generalized from it, started a company to produce the miracle cure, wrote books and misleading promotional pieces supporting his company's research and product, got a major news show to do a shoddy, uncritical story which suggested that maybe there was something to the miracle cure, and responded to criticism with the claim that his critics were conspiring to stifle him because his research was somehow a threat to traditional medical practitioners. There are no scientific studies done by independent researchers with proper controls which have substantiated the claim that shark cartilage is a useful treatment for cancer. In at least one such study, the treatment was found ineffective. Other studies are underway and their results should be available soon.