The Catholic tradition includes many prayers for healing, but one special example is the Prayer to St. Peregrine for healing from cancer. St. Peregrine is the patron saint of those who suffer from cancer, AIDS and other serious illnesses.
According to Catholic tradition, Peregrine converted to Catholicism as a young man and had a vision of Mary asking him to commit to the Servite Order in Siena. A cancerous sore grew on his leg, joined by others on his feet. His doctors decided that amputation was the only way to save his life. However, that night he sat before the crucifix in the hospital chapel, praying for healing.
The next morning when Peregrine awoke, his cancer was completely cured. This miracle played a major role in his beatification, although many more miracles were attributed to him during and after his lifetime. Between 1694 and 1726, one city in Spain attributed more than 300 cures from cancer and other conditions to his miraculous intervention.
Several versions of the prayer in English exist, but this passage from one version is typical: "Plead with the Blessed Virgin Mary, the Mother of Sorrows, whom you loved so tenderly and in union with whom you have suffered the pains of cancer, that she may help me with her powerful prayers and loving consolation."