  We investigate the inclusive top quark pair production in proton-proton and
proton-antiproton collisions at high energies in the framework of
kt-factorization QCD approach. Our study is based on the off-shell partonic
subprocesses g*g* -> QQ and q*q* -> QQ, where the transverse momentum of both
incoming quarks and gluons are taken into account. The unintegrated parton
densities in a proton are determined by the Kimber-Martin-Ryskin prescription
as well as the CCFM evolution equation. The conservative error analisys is
performed and comparison with the results of traditional NLO pQCD calculations
is done. Our predictions agree well with the recent experimental data taken by
the D0, CDF, CMS and ATLAS collaborations at the Tevatron and LHC energies.
