Two of the six men left seriously ill after taking part in a drugs trial have been allowed home.
The volunteers were treated at Northwick Park Hospital
Doctors at Northwick Park Hospital, in north-west London, said they had responded very well to their treatment and made an "excellent recovery".
One man remains critically ill while the other three are continuing to make progress, it was said.
All six volunteers had a rapid inflammatory response to the drug TGN1412 at a research unit.
A statement from the hospital said the two men will regularly visit the hospital as out-patients for check-ups and tests.
The man still in a critical condition has made "good improvement" over the past week, it said.
Martyn Day, of Leigh Day and Co solicitors, who is representing four of the men, said: "Our clients are pleased to be recovering but are very anxious about their futures at this time.
"We are looking for an early meeting with the drug companies to ensure that financially our clients can get their lives back in order as speedily as possible without recourse to the courts."
Medical research firm Parexel, which carried out the tests, insists its staff followed correct procedures.
The case is being investigated by the UK medicines watchdog, the Medicines and Healthcare products Regulatory Agency (MHRA).
TeGenero, which developed the drug, said TGN1412 had caused the glands of two monkeys to swell in earlier tests, but said the symptoms differed from those seen in the men's cases.