

Honey bees use this natural material to fix damage in the hive (covering the holes and sealing the cracks in the nest), to refine the internal walls, and to maintain constant humidity and temperature in the hive. The word propolis originates from ancient Greek, in which “pro” stands for “at the entrance to” and “polis” for “community” or “city”, indicating that this natural product is used in hive protection and defense. Propolis is a natural and sticky material, also known as bee glue, that honey bees ( Apis mellifera) produce from saps, resins, and mucilages collected from various parts of the plant, such as leaves, flower buds, and tree barks, then mixing them with beeswax and several bee enzymes. This review briefly summarizes the molecular mechanisms of anticancer activity of propolis and its compounds and highlights the potential benefits of propolis to reduce the side effects of chemotherapy and radiotherapy. Moreover, it may influence the tumor microenvironment and multidrug resistance of cancers. The results of the latest research show that propolis can inhibit proliferation, angiogenesis, and metastasis of cancer cells and stimulate apoptosis.

Propolis is a rich source of biologically active compounds, which affect numerous signaling pathways regulating crucial cellular processes. Cancer is one of the major burdens of disease worldwide, therefore, numerous studies are being conducted to develop new chemotherapeutic agents and treatments for cancer. The therapeutic activity of propolis, including antibacterial, antifungal, and anti-inflammatory effects, have been known since antiquity. Propolis is a natural material that honey bees ( Apis mellifera) produce from various botanical sources.
