  The soft breaking of gauge or other symmetries is the typical Quantum Field
Theory phenomenon. In many cases one can apply the St$\ddot{\rm u}$ckelberg
procedure, which means introducing some additional field or fields and restore
the gauge symmetry. The original softly broken theory corresponds to a
particular choice of the gauge fixing condition. In this paper we use this
scheme for performing quantum calculations for some softly broken gauge
theories in an arbitrary curved space-time. The following examples are treated
in details: Proca field, massive QED and massive torsion coupled to fermion.
Furthermore we present a qualitative discussions of the discontinuity of
quantum effects in the massive spin-2 field theory, paying special attention to
the similarity and differences with the massless limit in the spin-1 case.
