Perhaps you should try some spelling variations:
based preprocessing » based processing (Expand search), data preprocessing (Expand search), and reprocessing (Expand search)
decrease lesions » disease lesions (Expand search), decreased response (Expand search), decrease adhesion (Expand search)
lesions decrease » response decrease (Expand search), lesions case (Expand search)
decrease based » decreased base (Expand search), decrease blood (Expand search)
or decrease » not decrease (Expand search), to decrease (Expand search), _ decrease (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (Expand search)
decrease l » decrease il (Expand search), decrease _ (Expand search), decrease β (Expand search)
l decrease » _ decrease (Expand search), α decrease (Expand search), to decrease (Expand search)

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease l decrease based preprocessing ) OR ( decrease OR decrease lesions decrease ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease l decrease based preprocessing ) OR ( decrease or decrease lesions decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease l decrease based preprocessing ) OR ( decrease or decrease lesions decrease ))*.