Men of African descent have long been noted to be at increased risk of getting and dying of prostate cancer. While there are some biological reasons suggested to explain this, such as having lower levels of vitamin D, the much more likely explanation is systemic racism in the US health-care system. A study in 2019 found that when black and white men have equal access to medical care, their outcomes for prostate cancer are no different.
Drug and device companies continue to pay billions of dollars to physicians. Some of these payments are legitimate research grants or reflect payment for legitimate contributes physicians made in developing drugs or devices. A substantial number are basically just bribes (free dinners and trips) to prescribe or use their drugs or devices, or they are questionable payments to get doctors to write positive articles or teach positive courses about their products. You can read the details here, and search any particular doctor using the second link: