liver cancer

Aristolochic acid or its derivatives (AA) have been linked to kidney damage — sometimes severe enough to require kidney transplants, as we've described here
Proper functioning of the human body relies on microbial partners.
What goes up must come down.  There is no top without a bottom.  Two sides to every coin.  No front without a back.  A lid without a pot.  My cliche list is endless.  So, I will stop torturing you.