Polysaccharide-K

An overview of Polysaccharide-K, a protein-bound polysaccharide used in cancer treatment.

Polysaccharide-K (PSK), also known as Krestin, is a protein-bound polysaccharide derived from the mushroom Trametes versicolor, commonly known as the turkey tail mushroom. It is widely used in Japan as an adjunctive treatment for cancer.

Structure and Composition

Trametes versicolor, the source of Polysaccharide-K

Polysaccharide-K is a complex compound consisting of a polysaccharide backbone with protein components. The polysaccharide portion is primarily composed of beta-glucans, which are known for their immune-modulating properties. The protein component is believed to enhance the bioavailability and efficacy of the polysaccharide.

Mechanism of Action

PSK is thought to exert its effects through modulation of the immune system. It enhances the activity of natural killer cells, T cells, and other components of the immune system, which can help the body to fight cancer cells more effectively. Additionally, PSK may inhibit the growth of cancer cells directly and prevent metastasis.

Clinical Use

In Japan, PSK is approved for use as an adjunctive treatment in various types of cancer, including gastric cancer, colorectal cancer, and lung cancer. It is often used in conjunction with conventional treatments such as chemotherapy and radiation therapy.

Research and Efficacy

Numerous studies have been conducted to evaluate the efficacy of PSK in cancer treatment. Some studies suggest that PSK can improve survival rates and reduce recurrence in certain types of cancer. However, its use outside of Japan is limited, and more research is needed to fully understand its benefits and mechanisms.

Safety and Side Effects

PSK is generally well-tolerated, with few reported side effects. Some patients may experience mild gastrointestinal symptoms, such as nausea or diarrhea. As with any supplement, it is important for patients to discuss its use with their healthcare provider, especially when undergoing cancer treatment.

Related pages

• Trametes versicolor
• Beta-glucan
• Cancer treatment
• Immunotherapy