Between January and June, 3,294 women of 5,358 accepted an invitation to have a mammogram, the Health Ministry said.
It said in a statement that cancer in its early stages was detected in 33 women.
Since the opening of the Breast Screening Centre in October 2009, 83 of the 11,485 women who had a mammogram were found to have cancer.
Women born in 1955 are being invited for a mammogram in the coming days.
More information can be obtained from 2122 7470/1.