11. With constant exposure to UVB rays, signs of photoaging might appear and precancerous lesions or skin cancer may develop. 12. A positive result may indicate the presence of precancerous lesions or colorectal cancer, and should be followed by colonoscopy. 13. He also expressed concern about studies of olestra that appear to show rats developed precancerous lesions on their livers. 14. All were carriers of H . pylori; hundreds of them already had precancerous lesions at the outset of the study. 15. A dermatologist can use liquid nitrogen to burn off any precancerous lesions and prevent them from developing into full-blown melanoma. 16. Apart from pancreatic serous cystadenomas ( SCNs ), which are almost always benign, three types of precancerous lesion are recognized. 17. This can be done because the tumour is typically unifocal, not associated with precancerous lesions , and is unlikely to recur. 18. One chemical treatment that has been prescribed by doctors for years is Retin A, used to treat acne and precancerous lesions . 19. This allows targeted surgical removal of condylomatous and / or potentially precancerous lesions prior to the development of invasive cervical cancer. 20. They also healed precancerous lesions called actinic keratoses, sandpapery spots that develop into cancer up to 20 percent of the time.
