A petition against plans to close Lewisham's Accident and Emergency Department is to be handed to Downing Street. More than 20,000 local people, consultants, GPs and MPs have signed it.
The planned closure is part of a reorganisation of the South London Healthcare Trust, which has been put into administration.
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The Mayor of London said action was needed to "mitigate and palliate" the effects of the cuts on lowest income families.
The mayoral candidate said he believed the spike in knife crime and the restrictions imposed on police to stop and search are linked.
Dragos Moisica raped the victim on her 12th birthday in a hotel in Kenton. He has been jailed for 12 years.