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Being checked for hidden colorectal cancer is a smart bet, though it's hard to say whether it will ultimately extend your life span.

Recently, the National Colorectal Cancer Roundtable鈥攁 national organization of medical groups, health care providers, government agencies, and patient advocates鈥攍aunched the "80% by 2018" initiative. The goal is to convince more people to get screened for hidden colorectal cancer. Right now, about 65% of Americans do so.

Ask the doctor

Q. I'm a 48-year-old woman, and I've never had a mammogram. Different guidelines seem to say different things. What do you recommend?

A. You're right, there are several different guidelines. Probably the two most often consulted by doctors are those of the U.S. Preventive Services Task Force (USPSTF) and the American Cancer Society (ACS). Recent changes by the ACS bring its recommendations nearer to those of USPSTF. They disagree slightly about you. ACS says you should have a mammogram (because you are over 45), but USPSTF says to begin at age 50. Both expert committees stress that these recommendations apply only to women who are not at extra risk of breast cancer (extra risk includes, for example, having a parent, sibling, or child who's had breast cancer). If a woman is at extra risk, she should start getting mammograms earlier.

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Ask the Doctor

Q. I had a vasectomy many years ago, at age 45. I recently read that this increases my risk of prostate cancer. Should I be concerned?

A. Despite the reports you've heard about the connection between vasectomy and prostate cancer, the evidence is weak for a cause-and-effect relationship. Right now, this hypothetical risk should not cause you undue concern.

A new study confirms that active surveillance is a safe and reasonable alternative to immediate treatment for prostate cancer. In recently published study that followed 1,300 men, the prostate cancer survival rate after 10-15 years of active surveillance, was 99%. For some men, a strong discomfort with 鈥渓iving with cancer鈥� may steer them away from postponing treatment in favor of careful monitoring.

A new study confirms that active surveillance is a safe and reasonable alternative to immediate treatment for prostate cancer. In recently published study that followed 1,300 men, the prostate cancer survival rate after 10-15 years of active surveillance, was 99%. For some men, a strong discomfort with 鈥渓iving with cancer鈥� may steer them away from postponing treatment in favor of careful monitoring.

The purpose of treating ductal carcinoma in situ (DCIS)鈥攖he earliest, noninvasive form of breast cancer (often called "precancer")鈥攊s to prevent those lesions from becoming invasive and thereby greatly reduce the risk of dying from breast cancer. As mammography has become more precise, it has detected more DCIS, and more women get treatment with surgery and often radiation as well. An analysis published online by JAMA Oncology on Aug. 20, 2015, adds to increasing questions about the best way to manage DCIS in most women diagnosed with it.

Canadian researchers analyzed 20 years of data from 108,000 women with DCIS in a database maintained by the National Cancer Institute. Most women were treated with lumpectomy, often followed by radiation, or mastectomy. The researchers found that treatment with radiation or mastectomy did not lower the overall breast cancer death rate in women with DCIS. It remained at 3.3%鈥攖he average death rate from all breast cancers. However there were some groups鈥攊ncluding African American women and women under 40鈥攊n whom the death rate was higher (7% to 8%).

Q. Some of my friends take saw palmetto supplements to reduce urinary problems caused by an overgrown prostate, which I was recently diagnosed with. My friends swear by it, but is there any good evidence this stuff helps? Is saw palmetto safe?

A. The short answer is that we don't have great scientific evidence that taking saw palmetto truly reduces male urinary problems. On the other hand, it doesn't appear to cause major side effects either.

Q. I am currently receiving annual chest CT scans to check for hidden lung cancer (I used to be a heavy smoker). Should I be concerned about the cumulative effects of radiation exposure?

A. Radiation from medical scans can cause cancer, but the level of exposure considered potentially dangerous appears to be many times greater than the average CT scan. In addition, cancer from medical scans takes decades to develop, which makes it less of a concern for men being screened for lung cancer, which is currently only recommended for current or former smokers ages 55 and older. Radiation from CT scans is a bigger concern for children and young adults, who have more time to develop cancer after exposure to medical x-rays.