pharmaceutically-acceptable alcohol per volume of formulation, 12-18% weight of benzylbenzoate in a ricinoleate vehicle per volume of formulation and a sufficient amount of a ricinoleate vehicle so as to prepare a formulation of at least 45 mgml-1 of fulvestrant. with dependent claims 25 to 31 to remain unchanged. 3. Auxiliary to no. 2 above, the Patent is to be upheld with the following limited claims: 1. Use of fulvestrant in the preparation of a pharmaceutical formulation for the treatment of breast cancer by intra-muscular administration to human patients, wherein the formulation