Pulmonary Specialist Peter Bach Discusses New Findings on Benefits of CT Screening for Lung Cancer

VIDEO | 03:00
Epidemiologist Peter Bach discusses new findings that CT screening of high-risk people may detect lung cancer earlier and improve the effectiveness of treatment.
Video Details

For several decades, physicians and researchers have been investigating methods of screening people for lung cancer, the leading cause of cancer deaths. Now, a group of researchers and medical societies led by epidemiologist and pulmonary and critical care physician Peter Bach has found that computed tomography (CT) screening may prevent one in five cancer deaths for people at a very high risk of developing lung cancer.

Dr. Bach, who directs Memorial Sloan Kettering’s Center for Health Policy and Outcomes, and colleagues reviewed and summarized years of studies on lung cancer CT screening. Their findings, which appeared online on May 20 in The Journal of the American Medical Association, also led to the publication of new screening guidelines by the American College of Chest Physicians and the American Society for Clinical Oncology.

In a recent interview, Dr. Bach discussed the study results and the clinical recommendations.

What do this research and the new guidelines indicate about the benefits of CT screening for lung cancer?

By the time we diagnose most people with lung cancer today, the disease is in advanced stages, cannot be removed through surgery, and is difficult to cure. Because of this, researchers and members of the American Cancer Society, the National Comprehensive Cancer Network, the American College of Chest Physicians, and the American Society for Clinical Oncology came together to evaluate years of data about lung cancer screening.

We now have enough evidence and high-quality research to suggest that there is a small group of people who are at a very high risk for lung cancer who may benefit from annual CT screening for three years in a row. This type of screening can sometimes detect cancers at early stages, when treatment may be more effective.

Back to top

What types of people might benefit from lung CT screening?

People in a specific group are at a very high risk for lung cancer. They must be 55 to 74 years old. They must have smoked 30 pack years, which is calculated by multiplying the number of years they have smoked by the number of packs per day – which could be a pack per day for 30 years. This group includes current smokers as well as former smokers who have quit within the past 15 years.

We estimate that about eight million Americans may fall into this category. The people who do not fall into this group have a much lower chance of developing lung cancer, so screening might do more harm than good.

Back to top

What is the take-home message for people who are at a very high risk for lung cancer?

If you do fall into this group, it’s worth considering being screened and discussing it with your doctor. However, we must be careful to balance the potential benefits with the risks of radiation exposure or over-treatment that could result from screening. We have to be effective at differentiating risky findings on CT scans from findings that can be safely watched for a period of time, and do not require invasive follow-up procedures.

Back to top

Are there any other important factors that people should keep in mind when considering lung cancer screening?

The study that showed a benefit for lung cancer CT screening was conducted primarily at large centers that have many physicians who specialize in thoracic or lung diseases. We don’t have any evidence that the CT scanning approach will work in other settings.

There are still questions about how to most effectively accomplish screening while reducing any harms of over-diagnosis or over-treatment, but these are the first results to show that there may be a benefit to screening certain people.

Back to top


Commenting is disabled for this blog post.

I am a 46 yr old female, 119 lbs petite never smoked. I had a CT scan of my lungs, a spot on my right lung lower lobe near spine showed up, dr recommended a pet scan which was done, the same area was highlighted. Went to a Thoracic surgeon who recommened I have surgery to remove the nodule, when removed he would at the same time have it tested for any cancer cells, if so he then would remove the lower right lobe of my lung and the lymph nodes in the chest. Is this the correct approach to this finding, or are there possible other less invasive procedures. Because of the location of the nodule he did not recommend doing a needle bioshpy. I would be interested in your thoughts on this. Thank you.

We are unable to answer specific medical questions on our blog. If you would like to make an appointment with a Memorial Sloan-Kettering physician, please call our Physician Referral Service at 800-525-2225. Thanks for your comment!

I wo.uld like to know your cure percentage
For small cell cancer

If you would like to make an appointment with a Memorial Sloan-Kettering physician to discuss your condition, please call our Physician Referral Service at 800-525-2225. Thanks for your comment!

do you take care of carcanoid tumors in the broncial tube, 1.8cm, pet scan neg for cancer in the rest of the body.cta picked up the spot.broncial scope found it.

Thank you for your comment. If you would like to make an appointment at Memorial Sloan-Kettering and learn more about the diseases we treat, please call 800-525-2225.

My father is being treated for Stage IV lung cancer. My grandfather died of Lung cancer. Bother were smokers, my father for 15 years and my grandfather for most of his life, dies at 67. I'm 40 and I smoked from 17-33. I want to schedule an appointment to review the cases and a recommended plan to observe me before it creeps into my life. Thank you

If you would like to make an appointment with a Memorial Sloan-Kettering physician, please call 800-525-2225. Thanks for your comment!

I have a 1.8cm nodule in lower right lung got cat scan going for pet scan Dr said not cancer bc it was 2.0 and cancer does not shrink what is it and should I be worried? Yes I was a smoker

Kay, we are not able to provide personal medical advice on our blog. If you’d like to speak with a doctor at Memorial Sloan Kettering about this, you can call 800-525-2225. Thank you for your comment.

Just had CT Scan and was informed I have shadows but probably Normal. Smoked 40years . Dr. recommendation was quit smoking which I have. . What should be my next step? He is my Primary Doctor.