The results show that patients diagnosed with lung cancer at an early stage via CT screening have a 20-year survival rate of 80 percent. The average five-year survival rate for all lung cancer patients is 18.6 percent because only 16 percent of lung cancers are diagnosed at an early stage. More than half of people with lung cancer die within one year of being diagnosed, making it the leading cause of cancer deaths. By the time symptoms appear, it is often too late.
The findings are the latest to demonstrate the importance of routine and early screening in detecting cancers when they are small enough to be cured by surgical removal. Unfortunately, fewer than 6 percent of the people eligible for screening get it.
“While screening doesn’t prevent cancers from occurring, it is an important tool in identifying lung cancers in their early stage when they can be surgically removed,” said the study’s lead author, Claudia Henschke, PhD, MD, Professor of Diagnostic, Molecular and Interventional Radiology and Director of the Early Lung and Cardiac Action Program at the Icahn School of Medicine at Mount Sinai in New York. “Ultimately, anyone interested in being screened needs to know that if they are unfortunate enough to develop lung cancer, it can be cured if found early.”
While treatments of more advanced cancers with targeted therapy and immunotherapy have come a long way, the best tool against lung cancer deaths is early diagnosis through low-dose CT screening before symptoms occur, according to the study authors.
“Symptoms occur mainly in late-stage lung cancer,” Dr. Henschke said. “Thus, the best way to find early-stage lung cancer is by enrolling in an annual screening program.”
The U.S. Preventive Services Task Force recommends annual lung cancer screening with low-dose CT in adults aged 50 to 80 years who have a 20 pack-year smoking history, which equals at least a pack a day for 20 years, and who currently smoke or have quit within the past 15 years.
The study tracked the 20-year survival rate of 1,285 patients who were screened in the International Early Lung Cancer Action Program (I-ELCAP) and who were later diagnosed with early-stage lung cancer. While the overall survival of the participants was 80 percent, the survival rate for the 139 participants with nonsolid cancerous lung nodules and the 155 participants with nodules that had a partly solid consistency was 100 percent. For the 991 participants with solid nodules, the survival rate was 73 percent. For participants with Stage 1A cancers that measured 10 mm or less, the 20-year survival rate was 92 percent.
Dr. Henschke and colleagues have been studying the effectiveness of cancer detection with low-dose CT screening for years. The efforts of the researchers to advance CT screening for early lung disease led to the creation of the I-ELCAP. Started in 1992, this multi-institution, multi-national research program has enrolled more than 87,000 participants from over 80 institutions.
In 2006, the researchers identified a 10-year survival rate of 80 percent for the patients whose cancer was identified by CT screening. For this study, they looked at 20-year survival rates.
“What we present here is the 20-year follow-up on participants in our screening program who were diagnosed with lung cancer and subsequently treated,” Dr. Henschke said. “The key finding is that even after this long a time interval they are not dying of their lung cancer. And even if new lung cancers were found over time, as long as they continued with annual screening, they would be OK.”
Co-authors are David F. Yankelevitz, MD, Director of the Lung Biopsy Service at Icahn Mount Sinai; Daniel M. Libby, MD, Professor of Medicine at Weill Cornell Medical Center; James Smith, MD, Clinical Professor of Medicine at Weill Cornell Medical Center; Mark Pasmantier, MD, Weill Cornell Medical Center, and Rowena Yip, MPH, Senior Biostatistician at the I-ELCAP at Icahn Mount Sinai.
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Through the integration of its hospitals, labs, and schools, Mount Sinai offers comprehensive health care solutions from birth through geriatrics, leveraging innovative approaches such as artificial intelligence and informatics while keeping patients’ medical and emotional needs at the center of all treatment. The Health System includes approximately 7,300 primary and specialty care physicians; 13 joint-venture outpatient surgery centers throughout the five boroughs of New York City, Westchester, Long Island, and Florida; and more than 30 affiliated community health centers. We are consistently ranked by U.S. News & World Report‘s Best Hospitals, receiving high “Honor Roll” status, and are highly ranked: No. 1 in Geriatrics and top 20 in Cardiology/Heart Surgery, Diabetes/Endocrinology, Gastroenterology/GI Surgery, Neurology/Neurosurgery, Orthopedics, Pulmonology/Lung Surgery, Rehabilitation, and Urology. New York Eye and Ear Infirmary of Mount Sinai is ranked No. 12 in Ophthalmology. U.S. News & World Report’s “Best Children’s Hospitals” ranks Mount Sinai Kravis Children’s Hospital among the country’s best in several pediatric specialties. The Icahn School of Medicine at Mount Sinai is one of three medical schools that have earned distinction by multiple indicators: It is consistently ranked in the top 20 by U.S. News & World Report‘s “Best Medical Schools,” aligned with a U.S. News & World Report “Honor Roll” Hospital, and top 20 in the nation for National Institutes of Health funding and top 5 in the nation for numerous basic and clinical research areas. Newsweek’s “The World’s Best Smart Hospitals” ranks The Mount Sinai Hospital as No. 1 in New York and in the top five globally, and Mount Sinai Morningside in the top 20 globally.