Such products include:

Honey
Royal jelly (produced in the salivary glands of worker bees)
Bee venom
Propolis (a resin-like substance used in the construction of honeycombs)
In order to discover whether or not these products aid in stopping the growth and spread of tumors, researchers conducted a series of experiments. They first generated tumors in mice — via the injection of cancer cells — and then gave the honey-bee products to different mice before, at the same time, or after the injection.

Sweet Discoveries

Oral honey intake appeared to inhibit the development of tumors when given prior to the injection; however, when given afterwards the development of secondary cancers was amplified

Simultaneously injecting the mice with royal jelly and tumor cells reduced the spread of cancer

Tumors appeared to shrink after being injected with bee venom

When propolis was injected into the mice, subcutaneous tumor growth significantly reduced, while survival time increased

Though it is still unclear how honey-bee products affect human cancer cells, researchers suggest they may cause cell suicide, which helps the immune system fight the development of tumors. It was also noted that bee products should be considered in addition to (not instead of) chemotherapy treatment.