  We discuss Drell-Yan production of dileptons at high energies in forward
rapidity region in a hybrid high-energy approach. This approach uses
unintegrated gluon distributions in one proton and collinear quark/antiquark
distributions in the second proton. Corresponding momentum-space formula for
the differential cross sections in high-energy approximation has been derived.
The relation to the commonly used dipole approach is discussed. We conclude and
illustrate that some results of the dipole approaches are too approximate, as
far as kinemtics is considered, and in fact cannot be used for real
experiments. We find that the dipole formula is valid only in very
forward/backward rapidity regions ($|y| >$ 5). Some differential cross sections
for low-mass dilepton production are shown and compared to the LHCb and ATLAS
experimental data. In distinction to dipole approaches, we include four
Drell-Yan structure functions (the impact of interference structure functions
is rather small for typical experimental cuts). We find that both side
contributions ($g q/\bar q$ and $q/\bar q g$) have to be included even for the
LHCb rapidity coverage which is in contradiction with what is usually done in
the dipole approach. We present results for different unintegrated gluon
distributions from the literature (some of them include saturation effects). We
see no clear hints of saturation even at small $M_{ll}$.
