A reader posted a comment on one of my blogs and asked "What tests positively determines prostate cancer?" It prompted me to do a little research. 80 percent of men over 70 years old will get prostate cancer. That is a devastating statistic. A lot of times in the medical field diagnosing something requires a multitude of tests to rule out things and to get a better diagnosis. Such is the case for prostate cancer.

There are several tests used to diagnose prostate cancer. Blood tests, rectal exams, rectal ultrasounds, needle biopsy, and cystoscopy. A high level of PSA in the blood can be a sign of prostate cancer. PSA is a protein produced by cancerous prostate cells. With a rectal exam your doctor can feel for lumpy or a hard prostate. If a lump or hardening is found then most often they will do a needle biopsy to examine under a microscope. A cystoscopy is an examination of your bladder and uretha but can help determine several types of cancer and not just bladder cancer.

With all kinds of cancer, it is important to stay up to date with yearly exams for prevention. I hope this information helps.

In the not-too-distant future, dermatologists will be able to diagnose skin cancer without ever cutting the skin.

Right now, doctors cut out all suspicious lesions in order to examine them, to determine if they are cancerous or not. But with the development of a new microscope, cells can be examined right on the body -- without cutting.

Moles matter, reported Matt Lauer on Thursday's TODAY show during an interview with a skin cancer expert. Moles are highly associated with melanoma, the deadliest form of skin cancer. So it is critical that each mole is investigated. With this new high resolution technology -- essentially a video biopsy -- a camera will allow doctors to view cells, zero in on the area of concern, and pinpoint the exact cells that make up a mole. If the cells are similar in shape and size and have equal distribution, the mole is normal. If the individual cells are irregular and have no uniform pattern, the mole is abnormal and probably cancerous.

While cutting for biopsy purposes will one day be a thing of the past, cutting will still be necessary if a mole is characterized by cancerous cells. If it's cancer, it must come out. But the video biopsy can be used to map the border and boundaries and will allow for precise removal of the mole.

This technology is still developing -- but one day, perhaps eight to 10 years from now -- doctors will be able to more consistently detect cancer without removal of skin. For now, they must take a piece of the mole and put it under a microscope.

There are definite warning signs of skin cancer. Any mole that is asymmetrical with irregular borders and varied, dark colors should be reported to a physician. Also, any mole that changes in color, shape, or size and is bigger than a pencil eraser is cause for concern.

There are various risk factors that can contribute to the development of breast cancer. Being female is the single biggest risk factor that on its own puts all women in jeopardy. But there are other risks -- many beyond our control and some more significant than others -- that can help explain why some women are diagnosed with the most common cancer in women in the United States. And why others are not.