  Neutrino mixing sum rules are common to a large class of models based on the
(discrete) symmetry approach to lepton flavour. In this approach the neutrino
mixing matrix $U$ is assumed to have an underlying approximate symmetry form
$\tilde{U}_{\nu}$, which is dictated by, or associated with, the employed
(discrete) symmetry. In such a setup the cosine of the Dirac CP-violating phase
$\delta$ can be related to the three neutrino mixing angles in terms of a sum
rule which depends on the symmetry form of $\tilde{U}_{\nu}$. We consider five
extensively discussed possible symmetry forms of $\tilde{U}_{\nu}$: i)
bimaximal (BM) and ii) tri-bimaximal (TBM) forms, the forms corresponding to
iii) golden ratio type A (GRA) mixing, iv) golden ratio type B (GRB) mixing,
and v) hexagonal (HG) mixing. For each of these forms we investigate the
renormalisation group corrections to the sum rule predictions for $\delta$ in
the cases of neutrino Majorana mass term generated by the Weinberg (dimension
5) operator added to i) the Standard Model, and ii) the minimal SUSY extension
of the Standard Model.
