Study: CT Scans Don't Help In Lung Cancer

Survey Says There's No Evidence So Far That Screening Current And Former Smokers Saves Lives

(CBS/AP)  A new study suggests that screening smokers and former smokers for lung cancer doesn't save lives or prevent advanced disease and may lead to unneeded and harmful treatment.

But it's not the final word on CT scans.

Some experts have hoped that the scans, a special kind of X-ray that can detect tiny lung abnormalities, will prevent lung cancer deaths by getting people into treatment earlier. But there hasn't been convincing evidence of that.

A large, authoritative scientific study won't be completed for a few years. Without that evidence, the American Cancer Society doesn't recommend the test, which costs $300 to $400 — and most insurance companies won't pay for it.

The latest research, appearing in Wednesday's Journal of the American Medical Association, analyzed lung cancer deaths and cases of advanced lung cancer among 3,246 smokers and former smokers who had annual CT scans for about four years.

Researchers compared deaths and advanced cancer cases with rates predicted by a mathematical model. The model — based on a person's age, gender, asbestos exposure and smoking history — has proven valid in previous studies.

The model predicted there would be 33.4 cases of advanced cancer; there were 42. The model predicted 38.8 lung cancer deaths; there were 38.

"We don't see a trace of evidence that a single life was saved, that a single case of advanced cancer was avoided," said study co-author Dr. Peter Bach of Memorial Sloan-Kettering Cancer Center in New York.

CT screening did increase diagnosis and treatment. The people screened were three times more likely to be diagnosed with lung cancer and 10 times more likely to have lung surgery than predicted.

Bach said it's likely the cancers found by scans were so slow-growing they might never have caused death. Meanwhile, scanning missed the fast-growing, fatal cancers that popped up between the annual scans.

"It's like taking a photo of the night sky when you're looking for a shooting star," Bach said.

Because CT scanning led to more biopsies and surgeries, patients were at risk of complications such as lung punctures, bleeding and infection, Bach said.

"Getting screened for lung cancer with CT scanning is not only unproven, it's potentially a risky endeavor," he said.

Lung cancer is the leading cause of cancer death in the United States and worldwide. About 213,380 Americans will be diagnosed with lung cancer in 2007, and the disease is expected to kill 160,390. Smoking is the main culprit.

Last year, another study was more encouraging about the potential for CT screening. It found that people whose early tumors were detected and promptly removed had an estimated 10-year survival rate of 92 percent.

An author of that study, Dr. Claudia Henschke of New York-Presbyterian Hospital/Weill Cornell Medical Center, said the new findings don't detract from the benefit found in her study. She said both studies should encourage discussion of how best to evaluate screening tools.

Henschke believes the test should be more widely available, reports CBS News correspondent Dr. Jon LaPook.

"We reported that 20 percent of the people died and 80 percent are still alive after 10 years," she says.

Any alternative to CT scans for lung cancer screening is many years away.

Dr. David Johnson at Nashville's Vanderbilt-Ingram Cancer Center, who wasn't involved in either study, said the new research adds a note of caution about CT scans as smokers, former smokers and their doctors wait for results from the National Cancer Institute's study of 50,000 people, coming in a few years.

In the meantime, Johnson doesn't recommend routine CT scans. "There's nothing more powerful to protect yourself from lung cancer than stopping smoking," he said. "CT scanning is not the answer. Stopping smoking is the answer."

[bontetiger43]

As a lung cancer survivor of 2 years & a former addicted smoker of 3 packs a day, nothing says annual checkup to me as clear as CT SCAN. At the ripe age of 44, a CT Scan during my annual checkup showed a mass the size of a grapefruit in the right upper lobe. Because of the scan, chemo, radiation, great doctors & the grace of God I'm still here to tell the story. Should CT Scans be offered as part of the annual checkup & should insurance treat it as preventive? To me the answer is as simple as YES!!!

[nothappyatall]

One would think that forgetting for the moment the known sugeon general's warnigns on all cigs, the news about smoking and cancer being proven... that just the sickening and coughing/hacking one gets from the first few smokes would be a cluebus:

maybe, like holding your hand over a fire causing pain- it's not a great idea to be breathing in BURNING leaves and paper when they make you choke, cough, gag, hack and feel sick.

Oh, don't forget now, BUSH has cut federal funding for cancer research to fund his little war tirade, isn't that nice? Now any potential cure or treatment will be delayed longer.

[collgood]

This lung cancer debate is the same as the mammogram and prostate cancer debate. Does early detection save lives or just make diagnosis earlier for inevitable deadly cancers? My sister died of a still untreatable form of breast cancer in her 30s. After comparing Dr. L. LaPooks' talk on the nightly news and reading this article to the NY Times article on the same news, I found the NY Times article much more helpful. It is clear from the NY Times article that Dr Henschke's study had serious design and control flaws as quoted by medical critics. It should have never been compared as equal significance to the Memorial Sloan Cancer study, world experts in cancer. A larger cancer trial is eagerly awaited for its own sake.

[bellal-2009]

I don't believe it. CT scanning has to better than no detection.

[noaanhc]

I'm thankful that I never smoked,sure I tried cigarettes in my younger days,but this just wasn't for me and now looking back after all these years I say thank God for that.

[noaanhc]

Nicotine can be as addictive as crack cocaine,
that is how powerful this chemical is.If you were to inject nicotine directly into your veins this would instantly kill you.

[mitywhity]

Well, if you are stupid enough to smoke, STOP complaining. Every day you wake up is borrowed time.