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Biomedical subjects

A Symonds

Publications and source records attributed to A Symonds.

22 records · Page 2Linked to original sources

Down-regulation of nitric oxide production by droloxifene and toremifene in human breast cancer cells.

We investigated the effect of tamoxifen, 4-OH tamoxifen, toremifene droloxifene, interferon-alpha2a, interferon-alpha2b and interferon-alpha2c, singly and in combination, for their effect on nitric oxide production by MCF-7 and ZR-75-1 human breast cancer cells. Tamoxifen and 4-OH tamoxifen singly had no effect on nitric oxide production by either cell line. However, treatment with droloxifene or toremifene significantly reduced nitric oxide production by both MCF-7 and ZR-75-1 human breast cancer cell lines. Combination treatment with anti-estrogens and interferon-alpha2a interferon-alpha2b or interferon-alpha2c had no synergistic or additive effect compared to each drug singly.

Antineoplastic Combined Chemotherapy Protocols↗

Synergistic antitumour effect of a combination of toremifene and interferon-alpha on ZR-75-1 human breast cancer cells: dependence on interferon-alpha subtype.

We investigated the effect of toremifene, interferon-alpha2a, interferon-alpha2b and interferon-alpha2c, singly and in combination for their effect on the growth of ZR-75-1 human breast cancer cells. Median effect analysis was used to determine synergistic or additive effects. Anti-proliferative studies showed that the growth of ZR-75-1 cells was inhibited to a greater extent by combination treatment with toremifene plus interferon-alpha2a, resulting in a synergistic interaction (CI <1) for all concentrations tested. A combination of toremifene plus interferon-alpha2b resulted in a synergistic interaction (CI <1) for the two highest concentrations of toremifene (10(-6) and 10(-7) M) and an additive effect (CI approximately equal to 1) for the lower concentrations (10(-8) to 10(-10) M). When toremifene was combined with interferon-alpha2c no additive or synergistic interaction was determined.

Antineoplastic Agents, Hormonal↗