Anastacia forced to pull out of Dubai World Cup performance

American songstress Anastacia is pulling out of her planned concert at the Dubai World Cup, after being diagnosed with breast cancer for the second time.

She was due to take center stage at the after-race concert at the horseracing world cup at the end of this month.

In a statement, Meydan and the organizers of the Dubai World Cup said they wished Anastacia "the best of health and a safe recovery," adding that they "hoped to welcome her back to Dubai soon."

The singer has now been forced to cancel all performances, tours and any travel from now until further notice, according to a report from Arabian Business on Friday.

In a tweet, Anastacia said of the cancer: "Yes it has come back, yes i'm fighting it, but ths time the battle is a pretty intense. Thank U 4 yr luv&prayers."

The singer had successfully survived her 2003 battle with the disease.

Thousands of people have been leaving messages on the pop star’s Facebook page, wishing her well.