  The aim of this paper is to prove that there exists no cohomogeneity one
$G-$invariant proper biharmonic hypersurface into the Euclidean space ${\mathbb
R}^n$, where $G$ denotes a tranformation group which acts on ${\mathbb R}^n$ by
isometries, with codimension two principal orbits. This result may be
considered in the context of the Chen conjecture, since this family of
hypersurfaces includes examples with up to seven distinct principal curvatures.
The paper uses the methods of equivariant differential geometry. In particular,
the technique of proof provides a unified treatment for all these $G-$actions.
