Is ruqyah therapy sufficient in place of chemotherapy for cancer patients if the disease is caused by magic? And has it been proven that Quranic verses treat cancer as an alternative to medical treatment?

Ruqyah with the Holy Quran is absolutely permissible, and all its verses are a healing for the diseases of hearts and bodies. The Quran is the complete healing from all spiritual, bodily, worldly, and otherworldly ailments, provided that the sick person treats himself with it sincerely, with faith, complete acceptance, firm conviction, and by fulfilling its conditions. There are no specific verses for treating cancer, and treating oneself with the Quran and legitimate ruqyah does not contradict the use of medicines and treatments.