Perhaps you should try some spelling variations:
significantly altered » significantly affected (Expand Search), significantly elevated (Expand Search), significantly lower (Expand Search)
significantly improve » significantly improved (Expand Search)
altered decrease » altered release (Expand Search), observed decrease (Expand Search), teer decrease (Expand Search)
improve decrease » improve disease (Expand Search), improved urease (Expand Search), improves disease (Expand Search)

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

• Removing quotes may allow a broader search: (( significantly altered decrease ) OR ( significantly improve decrease ))~.