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  • Digital breast...

Digital breast tomosynthesis reduces rate of interval cancers

Written By : Hina Zahid |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2021-04-11T22:03:47+05:30  |  Updated On 11 April 2021 10:03 PM IST
Digital breast tomosynthesis reduces rate of interval cancers
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OAK BROOK, Ill. - Screening with digital breast tomosynthesis (DBT) reduces the rate of interval breast cancers compared to screening with digital mammography, according to a study published in Radiology. The study adds to a growing body of evidence supporting DBT as a breast cancer screening tool with important advantages over mammography.

DBT works by capturing a series of X-ray images of the breast from different angles. Previous research has shown that it has a higher sensitivity for breast cancer detection than digital mammography.

The impact of these additional DBT-detected cancers is not fully understood. While they may constitute a screening benefit, they could also contribute to overdiagnosis, a term for the diagnosis of early-stage, slow-growing cancers that would not have caused harm to the patient in their lifetime.

The rate of interval cancers--cancers that arise between routine screenings--offers one way to better elucidate screening benefits. They are considered more aggressive than cancers detected during a screening exam.

"Interval cancers have, in general, a more aggressive biological profile than screen-detected cancers," said study lead author Kristin Johnson, M.D., radiology resident at Skåne University Hospital in Malmö, and Ph.D. student at Lund University, Sweden. "This means that the prognosis is less favorable for interval cancers compared to screen-detected cancers."

Interval cancer detection rate reporting is required in many screening programs as an indicator of effectiveness. A reduction in the interval cancer rate when using DBT might be attributed to improved detection of rapidly growing cancers with poorer prognosis, possibly contributing to lower breast cancer mortality.

For the new study, Dr. Johnson and colleagues compared interval cancer rates in Sweden's population-based Malmö Breast Tomosynthesis Screening Trial with those from an age-matched control group of patients who underwent digital mammography at the same center.

The study group included almost 15,000 women who were screened with DBT and digital mammography between 2010 and 2015. Those women were matched with a control group of more than 26,000 women who had only digital mammography screening during the same time period.

The interval cancer rate in the patients screened with DBT and digital mammography was 1.6 per 1,000 screened, significantly lower than 2.8 per 1000 in the group screened with digital mammography only. The interval cancers in the trial generally had non-favorable characteristics.

The reduced interval cancer rate after screening with DBT could translate into screening benefits, according to Dr. Johnson.

"One could speculate that some of the additional cancers detected in DBT screening would have been diagnosed as interval cancers if not detected by DBT," she said.

The results support the growing evidence of DBT as a screening modality with potential to replace digital mammography in future breast cancer screening. However, Dr. Johnson cautioned that other trials have not shown significantly reduced interval cancer rates in DBT screening compared to digital mammography screening. And interval cancer rates, while important, are not the only measure when evaluating the potential benefits from DBT in screening.

"Other factors, such as cancer types detected and cost-benefit, have to be taken into account," Dr. Johnson said.

Toward that end, the researchers are working on a cost-benefit analysis of the Malmö Breast Tomosynthesis Screening Trial. They are also analyzing the trial for false positive recalls, those instances when patients are called back for additional screening for suspicious findings that end up being benign.


digital breast tomosynthesisinterval cancersradiologyx raybreast cancer
Source : Radiology
Hina Zahid
Hina Zahid

    Hina Zahid Joined Medical Dialogue in 2017 with a passion to work as a Reporter. She coordinates with various national and international journals and association and covers all the stories related to Medical guidelines, Medical Journals, rare medical surgeries as well as all the updates in the medical field. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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