A compound defined by formula 1 ** Formula ** Where a, b and c respectively indicate, independently of each other, a single bond or a double bond, with the proviso that at least one of a, b and c represents a double bond , and with the proviso that if a is a single bond and b is a double bond, R2 is not H; R1 is either hydrogen or C1 to C6 alkyl; R2 is either OR5 or hydrogen, where R5 is hydrogen or C1 to C12 straight or branched chain alkyl; R3 is, in the case that c is a single bond, either hydrogen or C1 to C6 alkyl, or in case c is a double bond, CHR5, where R5 is the same as defined above; R4 is hydrogen, C1 to C12 alkyl, phenyl unsubstituted or substituted by a C1 to C12 alkyl or COR6 acyl group; R6 being hydrogen, C1 to C12 straight or branched chain alkyl, phenyl or benzoyl, respectively unsubstituted or substituted by C1 to C12 alkyl, or any group leading to hydroxyl after biological metabolization or chemical deprotection, particularly an ester, ether, acetal, carbonate, carbamate, phosphate, phosphonate, ketal, sulfate or sulphonate; and salts thereof, For use in medical treatment as an angiogenesis inhibitor, wherein said compound is 4-hydroxytestosterone or its salts or esters.Un compuesto definido por la fórmula 1**Fórmula** En donde a, b y c respectivamente indican, independientemente unos de los otros, un enlace sencillo o un doble enlace, con la condición de que al menos uno de a, b y c representa un doble enlace, y con la condición de que si a es un enlace sencillo y b es un doble enlace, R2 no es H; R1 es o bien hidrógeno o alquilo C1 a C6; R2 es o bien OR5 o hidrógeno, en donde R5 es hidrógeno o alquilo de cadena lineal o ramificada C1 a C12; R3 es, en el caso de que c sea un enlace sencillo, o bien hidrógeno o alquilo C1 a C6, o en caso de que c sea un doble enlace, CHR5, en donde R5 es lo mismo que se define antes; R4 es hidrógeno, alquilo C1 a C12, fenilo no sustituido o sustituido por un grupo alquilo C1 a C12 o acilo COR6; siendo R6 hidrógen