Auckland Uniservices Limited

Karin Pchalek

William Alexander Denny

William Robert Wilson

Michael Patrick Hay

Kevin Owen Hicks

Frederik Bastiaan Pruijn

Ho Huat Lee

Bronwyn Gae Siim

Adrian Blaser

Shangjin Yang

The invention relates to novel tricyclic 1,2,4-triazine-1-oxides and novel tricyclic 1,2,4-triazine-1,4-dioxides of formula I and to related analogues, to their preparation, and to their use as hypoxia-selective drugs and radiosensitizers for cancer therapy, both alone or in combination with radiation and/or other anticancer drugs.

Tricyclic 1,2,4-triazine oxides and compositions for therapeutic use in cancer treatments

The compound 3-ethyl-6-[3-(4-morpholinyl)propoxy]-1,2,4-benzotriazine 1,4-dioxide and pharmacologically acceptable salts thereof. A method of treating cancer in a subject is also described in which 3-ethyl-6-[3-(4-morpholinyl)propoxy]-1,2,4-benzotriazine 1,4-dioxide or a pharmacologically acceptable salt thereof is administered to tumor cells in a hypoxic environment. Also described is a method of radiosensitising in a subject tumor cells of solid tumors in hypoxic conditions by administering to the subject a pharmaceutical composition containing 3-ethyl-6-[3-(4-morpholinyl)propoxy]-1,2,4-benzotriazine 1,4-dioxide or a pharmacologically acceptable salt thereof in an amount sufficient to produce radiosensitivity in the tumor cells, and subjecting the tumor cells to radiation. A pharmaceutical composition is additionally provided containing a therapeutically effective amount of 3-ethyl-6-[3-(4-morpholinyl)propoxy]-1,2,4-benzotriazine 1,4-dioxide or a pharmacologically acceptable salt thereof and a pharmaceutically acceptable excipient, adjuvant, carrier, buffer or stabiliser.

1,2,4-benzotriazine-1,4-dioxides

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Auckland, New Zealand

Karin Pchalek