Disclosed are compositions which include an isolated soft tissue from Modiolus modiolus ("MM") and compositions which include an oil isolated from MM or a portion thereof. Also disclosed are methods of treating adenocarcinoma in a subject; methods of decreasing proliferation of adenocarcinoma cells, or of inducing apoptosis of adenocarcinoma cells, or of inducing differentiation of adenocarcinoma cells into non-cancerous cells; methods of inhibiting the activity of 5-lipoxygenase or 12-lipoxygenase or both in cells; and methods of treating a subject suffering from a disease or condition associated with excessive 5-lipoxygenase activity or 12-lipoxygenase activity or both. A process for preparing an MM extract by contacting MM or a portion thereof with a solvent under conditions effective to extract one or more materials from the MM or portion thereof is also described.