ATLANTA (AP) _ Archbishop Desmond Tutu has shown no signs of prostate cancer in blood tests taken since his surgery last fall, his doctor said Wednesday.

Dr. Harry Clarke, the urologist who performed the surgery in November at Emory University Hospital, said the cancerous tissue in and around Tutu's prostate gland has not recurred.

``It's really a positive sign,'' Clarke said.

Tutu, 68, the former Anglican archbishop of Cape Town, South Africa, was diagnosed with cancer in 1997. It returned last year.

Tutu won the Nobel Peace Prize in 1984 for his efforts to end apartheid in South Africa. He is now a visiting professor of theology at Emory in Atlanta.