  The high-energy factorization and the associated B-JIMWLK or BK evolution
equations are presented, using the example of DIS structure functions. The
necessity of taking gluon saturation into account is discussed, and also the
various approximations underlying high-energy factorization. The appearance of
large NLL corrections in such a framework with or without gluon saturation is
recalled, and their physical origin is explained. Finally, old and new results
are presented about the resummation of some of those large corrections, related
to kinematical approximations.
