Features of density profile behavior in T-10 experiments with gas puffing are discussed in this paper. It is shown that density peaking increases with the increase in collisionality in ohmic discharges and in discharges with electron cyclotron resonant heating. The observed regularity cannot be explained by neoclassical effects only. The existence of a turbulent pinch mechanism leading to a relative increase in the inward particle flux should be proposed. The stability of drift turbulence is discussed since these instabilities could be considered as a candidate mechanism explaining the anomalous transport.