The dwarf tapeworm, Hymenolepis nana, cancer cells linked to human tumors: CDC

Scientists at the Centers for Disease Control and Prevention have discovered cancer cells originating in a common tapeworm may take root in people with weakened immune systems, causing cancer-like tumors. It is the first known case of a person becoming ill from cancer cells that arose in a parasite - in this case, Hymenolepis nana, ["]