Effect of polysaccharide-peptide (PSP), an extract from yun-zhi, on chemotherapy-induced cytopenias.

Zhou LQ, Koo WH, Ang PT.

Department of Medical Oncology, Singapore General Hospital, Singapore.


Polysaccharide-peptide (PSP) is a protein-bound complex carbohydrate derived from mycelia extract of Chinese fungus coriolus versicolor, or better known as Yun-Zhi. It has been shown to inhibit growth of cultured tumour cells, and it prevents cytotoxic-induced bone marrow suppression. An animal study was conducted with 24 Wistar rats to verify the myeloprotective effect of PSP. The rats were divided into two equal groups: group A (given cyclophosphamide [CTX]) and group B (given PSP and CTX). The body weights were similar in both groups of rats. In phase 1, all rats were given intravenous CTX 75 mg/kg. In addition, B rats received PSP 20 mg/day orally from 7 days before CTX to 14 days after CTX. Phase 2 was carried out two weeks after full recovery from CTX-induced cytopenia. The CTX was decreased to 60 mg/kg, and the group B rats received an increased dose of PSP 1.2 g/day for the same 21 days. In both phases, the CTX was well tolerated. Nadir white blood cell count was reached on day 4 and all counts recovered by day 10. There was no difference in absolute neutrophil, lymphocyte and platelet counts between groups A and B. We concluded that oral PSP did not prevent CTX-induced cytopenia in rats.

PMID: 8779535 [PubMed – indexed for MEDLINE]