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Malignant cystosarcoma phyllodes (MCSP) is a rare breast tumor. Chemotherapeutic regimens for treatment of MCSP have not been established. We previously established an MCSP xenograft line MC-3-JCK. In this study, we established a new MCSP xenograft line, MC-10-JCK, by serial transplantation in nude mice. We studied the chemosensitivity of these two MCSP tumor xenografts to anticancer drugs in vivo. We also examined the expression of multidrug resistance-related proteins such as p-glycoprotein (Pgp) and multidrug resistance-associated protein (MRP) by immunohistochemical analysis. These two xenografts were sensitive to doxorubicin, vincristine and cyclophosphamide in vivo. Immunohistochemically, clinical specimens and xenografts were negative for Pgp and MRP expression. These results are consistent with the chemosensitivity of human MCSP to lipophilic anticancer compounds.

Type

Journal article

Journal

Oncol Rep

Publication Date

03/2000

Volume

7

Pages

257 - 260

Keywords

ATP-Binding Cassette, Sub-Family B, Member 1, Animals, Antineoplastic Agents, Breast Neoplasms, Cyclophosphamide, Doxorubicin, Drug Resistance, Neoplasm, Drug Screening Assays, Antitumor, Female, Humans, Mice, Mice, Nude, Neoplasm Transplantation, Phyllodes Tumor, Transplantation, Heterologous, Vincristine