(Vancouver, WA)  --  A Vancouver woman is expressing gratitude for the return of a cancer memorial that was stolen from her front yard.  Teresa Marble of Vancouver tells KATU-2 an acquaintance found the colorfully painted rock about half a mile from her home and returned it to her on Monday.  Marble says the acquaintance found it sitting upside down at a construction site.  The memorial rock was stolen just before Thanksgiving.  Marble says she keeps the rock as a tribute to friends she has lost to cancer.