Lauren Frayer

And he went on to say that Khan, a popular center-left politician who is of Pakistani descent, owes his election victories to the rising number of immigrants here in London.

Khan in turn told Politico that Americans are actually flocking to London, in part because of its liberal values that are the antithesis of Trump's.

He said the U.S.

president, who has insulted him in the past many times, seems to be obsessed and he doesn't know why.

Lauren Freyer, NPR News, London.

Scientists behind this new treatment call it the world's first therapy of its type, using advanced gene editing with certain immune cells.

It's being tried for patients whose cancer has not responded to standard treatments.

The first patient was a 13-year-old girl.

She and eight other children plus two adults have all undergone treatment as part of an early-stage clinical trial.

It was conducted by researchers at University College London and the city's Great Ormond Street Hospital.

According to results published in the New England Journal of Medicine, nine of those 11 patients achieved deep remission that enabled them to go for bone marrow transplants.

And seven of them remained disease-free between three months and three years after treatment, including that first teenage patient who now wants to be a cancer doctor.

Lauren Freyer, NPR News, London.

You're listening to NPR News.

Much friendlier.

Zelensky's meeting today with leaders of Britain, France, Germany.

They're three of his biggest supporters, the three NATO countries with the biggest budgets besides the U.S., incidentally.

And they're leading a coalition of the willing to help defend Ukraine with aid, with weapons, possibly even with French and British peacekeepers on the ground if and when there is a peace deal.

I asked Mujtaba Rahman, the Europe Managing Director at the Eurasia Group.

It's a risk analysis firm.