Anticancer Activities of Essential Oils Constituents and Synergy with Conventional Therapies: A Review
Abstract
Many studies have shown that a large number of terpenoids and aromatic compounds contained in essential oils
have significant anticancer activities, both on cell lines and on tumors in animals. The activity of these constituents
is related to the activation of cell death (apoptosis) induced by the caspases proteins in cancer cells, with minor
modifications of healthy cells. Many phenomena seem to occur, among which are as follows: overexpression
and regulation of liver detoxification enzymes, changes in the membrane potential of cancer cells and mitochondria,
production of free radicals in cancer cells, inhibition of angiogenesis, and modification of tumor-inducing
genes. These active essential oil constituents appear to act synergistically with conventional chemotherapy and
radiotherapy, and some clinical studies in humans are beginning to be realized. In this review, we discuss about
the antitumoral activity of 13 essential oil components selected among the most studied in the literature, with a
focus on their possible mode of action. We also report current data on the anticancer properties of several total
essential oils.