41. A third was a 1993 diagnosis of malignant melanoma , the most lethal type of skin cancer. 42. Tumor depth is one of the cornerstones of the current AJCC TNM staging of malignant melanoma . 43. Maureen Reagan was " surrounded by loved ones after a courageous 5-year-long battle with malignant melanoma ," 44. Bourassa died at Montreal's Notre-Dame Hospital, which he entered after being diagnosed with malignant melanoma in June. 45. These photocarcinogenic substances were banned years after they had caused many cases of malignant melanoma and deaths. 46. On Friday, the 66-year-old coach was diagnosed with malignant melanoma , the most serious form of skin cancer. 47. Subsequent studies confirmed and refined the role of depth of invasion in the prognosis of malignant melanoma . 48. Some medical experts say questions remain : Does interferon really work to prevent malignant melanomas from recurring? 49. It was developed by Shaun Hughes of Washington, who was diagnosed with malignant melanoma at age 26. 50. Doctors had declared him cured last year, since the malignant melanoma had not recurred for five years.