Studies have found that Bee pollen reduces some of the side effects of radiation therapy. There has been evidence that bee pollen can inhibit tumor growth and reduce chemotherapy pain in cancer patients in previous studies
Propolis (the bee-collected and stored resins of plant resins like from poplar buds, broadly anti-microbial), pollen, honey and even the venom of honey bees, are used in the practice of Apitherapy, to promote better health and address specific acute health problems like cancer. It's a big topic and you can find many sources searching for apitherapy. "Pollen" has varied sources and effects, so don't expect it to be equivalent to a specific active ingredient.
Bee collected pollen used in preparation of different medicine used against cancer therapy..however the most important is bee venom that have antioxidant anticancer producing growth harmone helpful for cureing cancer disease and decrease the tumour outgrowth