  We review progress in the global QCD analysis by the CTEQ-TEA group since the
publication of CT18 parton distribution functions (PDFs) in the proton.
Specifically, we discuss comparisons of CT18 NNLO predictions with the LHC 13
TeV measurements as well as with the FNAL SeaQuest and BNL STAR data on lepton
pair production. The specialized CT18X PDFs approximating saturation effects
are compared with the CT18sx PDFs obtained using NLL/NLO small-$x$ resummation.
Short summaries are presented for the special CT18 parton distributions with
fitted charm and with lattice QCD inputs. A recent comparative analysis of the
impact of deuteron nuclear effects on the parton distributions by the CTEQ-JLab
and CTEQ-TEA groups is summarized.
