Bonnie and her family / the new end of treatment bell. Lewisham and Greenwich NHS Trust A kind and courageous six-year-old girl has become one of the first to ring a special bell at Queen Elizabeth Hospital to mark the end of her cancer treatment. Bonnie Meehan-Lysandrou was a patient on the Tiger Ward of the Woolwich hospital after being diagnosed with acute lymphoblastic leukaemia at the age of four. The six-year-old has been receiving chemotherapy treatment on Lewisham and Greenwich NHS Trust s children s cancer unit and at The Royal Marsden Hospital for two years now. But on July 8, Bonnie was finally able to ring a special end-of-treatment bell in a outdoor ceremony celebrating her triumph.