Campaigners battling to keep cancer services in the borough won a victory this week.
Health bosses had been planning to move the services from Mount Vernon Hospital in Rickmansworth Road, Northwood, to a another site, either a new hospital in Hatfield, Hertfordshire or Charing Cross Hospital, Hammersmith.
But this week they announced it would be too costly to build a new hospital in Hatfield.
The Hammersmith option is still on the table.
The East and North Hertfordshire NHS Trust, which has managed the Mount Vernon cancer centre since April last year, made the announcement on Friday.
Chairwoman of health pressure group Community Voice, Joan Davis, said: “We are absolutely delighted, it’s wonderful news.
“It does mean that the cancer centre will stay on its present site for a long time. Any alternative propositions will take time.
“It takes time to move the biggest cancer centre south of Birmingham.
“We will be fighting to keep it there forever. Looking at the long term is impossible at the moment, but we have won a battle, even though the fight will go on to win the war.”
Ruislip-Northwood Tory MP Nick Hurd said: “It’s time for us to launch a campaign to get behind Mount Vernon and persuade the authorities it is time to consider keeping the cancer centre at Mount Vernon past 2012.
“We are launching a cross-party campaign. It is our chance to fix a long term future and keep the cancer centre there and around the cancer centre persuade them to build a fantastic community hospital.”
Peter Gibson, head of public affairs at the ENH NHS Trust, said there would be further consultation.
He added that a significant amount of money had been spent on Mount Vernon since the takeover.
A spokeswoman for Hillingdon Hospital NHS Trust said: “The trust will be in discussions with our health partners and the London Health Authority about the impact and what this will mean for local people.”
The ‘plastics’ and burns unit was moved off the Mount Vernon site recently, with all out-patient appointments being carried out at the Royal Free Hospital.