  We compute one loop radiative corrections to the physical neutralino masses
in the MSSM considering the dominant top-stop contributions. We present a
numerical renormalization group analysis of the feasibility of the radiative
gauge symmetry breaking parametrized by the standard soft supersymmetry
breaking terms. Although the above computed effects can be in principle large
for extreme values of the Yukawa couplings, they do not in general exceed a few
per cent for most of the parameter space. Therefore tree level constraints
imposed on the gluino mass $m_{\tilde{g}}$ and on the superpotential parameter
$\mu$ by LEP1 and CDF experiments, are not upset by the heavy top-stop sector.
