FREE ACCESS: Worthington native to hold book-signing March 6

Thursday, February 20, 2020
Worthington native and author Leslie Ferris Yerger.
Courtesy photo

Editor's note: Due to the important health information contained in this story, we have decided to make it free for all to read.

Worthington native Leslie Ferris Yerger, a graduate of Purdue University, will appear to speak and sign copies of her book, “Probably Benign,” March 6 from 2 p.m. to 5 p.m. at the Worthington-Jefferson Public Library in Worthington.

Yerger, in a TED talk given on Oct. 17, 2019, asks, “If you could help a woman, any woman, maybe it’s you, your friend, your neighbor, your daughter, your mother, if you could help her find her breast cancer early, while it’s still curable, before it gets to a late stage when it’s not curable, would you do that? Of course you would, no one is going to say no to that, but how would you do it?”

Over the last two decades, she explains, we have made exceptionally few advances in preventing the deaths of the approximately 42,000 women every year who are diagnosed in the late stages of the disease.

Yerger herself was diagnosed with Stage IV lobular breast cancer in Nov. 2017, when abnormalities were found during a routine bone density scan. Her cancer was not visible on either a mammogram or an ultrasound, as would sometimes be the case with lobular cancer hiding in dense breast tissue.

“Where that leaves us is early detection,” Yerger continues. “That’s why the mammogram was invented, to find tumors early while they can still be treated. But the mammogram has its shortcomings, and that has everything to do with breast density. I hope that all of you know about this already, but for those of you who don’t, I will do a quick overview.”

Yerger goes on to explain the term to her audience, and shows the differences in breast density which can lead to undiagnosed tumors, and has also done so on the pages of her book, which gives the story of her journey from her diagnosis to her determination to educate women about supplemental breast cancer screening, so that her story does not become their story.

According to, “Breast density is a proportional measure of the glandular, connective and fatty tissues within a woman’s breasts. It is most commonly determined using mammography, a diagnostic test that uses low dose x-rays. Having dense breasts is not an abnormal condition; in fact, about half of all women over 40 have dense breasts. Glandular tissue includes lobules (which produce milk during lactation) and ducts that carry milk from the lobules to the nipple during breastfeeding. Connective tissue (also called fibrous tissue), supports and holds glandular tissue in place. Fatty tissue helps give breasts their size and shape.”

Breast density among women is divided into four categories: a, b, c and d, with ‘a’ being the least dense and ‘d’ being the most dense. Ten percent of women fall into the ‘a’ category, 40 percent into the ‘b’ category, 40 percent into the ‘c’ category and 10 percent into the ‘d’ category.

Yerger says the failure of mammography and ultrasound in her case is not a failure of anyone, but a failure of our current technology. Regular mammograms, according to Medline Plus, will detect early stage tumors in 98 percent of women in the ‘a’ and ‘b’ categories. For women in the ‘c’ and ‘d’ categories with denser breasts, the percentage drops to about half.

“Women with extremely dense breasts are four to six times more likely to get breast cancer,” Yerger writes in Probably Benign. “And 71 percent of all breast cancers are in women with dense breasts.”

For these women, other supplemental technologies, such as breast tomosynthesis (3D mammography), breast ultrasound and breast MRI are available, but are rarely offered routinely, and women who are unaware of their breast density may not know they should request them.

Yerger seeks to make a positive impact in advancing the next major breakthrough in breast cancer screening and making diagnostic tests for dense breasts more routine and, to that end, she underwent, in 2018, a 500-mile walk, the Camino Santiago from France to Santiago De Compostela, to raise funds for breast cancer research, and began her campaign known as “Walk The Way With Her.”

According to, “Camino means ‘the way’, and the Camino de Santiago means ‘the way of St. James’. The Camino de Santiago is a network of trails leading from all over Europe to the Cathedral at Santiago de Compostela, where legend has it that the bones of St James, the apostle of Jesus, are kept. Historically, pilgrims from all over the world have traveled the caminos to reach the Cathedral. People walk the trails for personal, health and spiritual and religious reasons. In 2018, Leslie walked the Frances Way, which is the most heavily traveled camino. It starts in Saint-Jean-Pied-de-Port in France and ends at the Cathedral in Santiago de Compostela in Galicia, Spain.

The Frances Way is 500 miles from start to finish, traversing the Pyrenees, and winding through many towns and villages along the way. It took Yerger 40 days to complete the walk.

Yerger says, in her book, that her experience on the Frances Way helped her physically, mentally and spiritually.

“On the Camino, you realize very quickly what is most important to you on your journey,” she writes. “If you get too hung up on all the details, you’ll miss out on exploring why you’re on the Camino to begin with. For healing. For transformation. For growth. For progress.”

Yerger learned of a brand-new technology, called Molecular Breast Imaging, or MBI, a new screening technology that illuminates cancer in dense breasts that can not be seen by even a 3D mammogram.

According to, “Women have been told the 3D mammography is the new ‘gold standard’ for breast cancer detection, yet mammography finds less than half of all cancers in dense breast tissue, which pertains to approximately half of all women. MBI was designed to overcome this shortcoming in mammography, allowing many more cancers to be detected when the disease is still curable. MBI screening is slowly becoming more available to women across the country, yet very few know about it, even doctors.”

Yerger’s site reveals that MBI has proven to detect 3 to 4 times more breast cancers at an early stage than standard mammography in women with dense breast tissue.

Digging further into Yerger’s website, we learn that dense breast tissue alone is a high risk factor for breast cancer, which helps to explain why mammography screening is inadequate for half the female population.

“What’s the next step necessary so more women with breast cancer become survivors?” Yerger asks. “Funding the Mayo Clinic’s “Density Matters” study.”

The study seeks to prove three things: That MBI detects more cancers than 3D mammography, that cost-per-cancer detected is lower for MBI vs mammography and that the radiation exposure involved with MBI is equal to the exposure involved in 3D mammography.

Preliminary results of the study indicate that, out of 1,000 women tested to date, nine cancers were found using MBI and two cancers were found with 3D mammography.

Yerger’s Camino 2020 walk will see Walk The Way With Her collaborating with to raise funds which will support the Density Matters study, which will help to make MBI more available to women around the world.

Currently, just four Indiana hospitals offer MBI services: Marion General in Marion, St. Joseph in Mishiwaka, MHP Hospital in Shelbyville and Saint Joseph Health Systems in South Bend.

Copies of “Probably Benign" will be available for purchase at the book-signing event, and a portion of the proceeds will be donated to the study.

For more information about Leslie Ferris Yerger, visit For further information about Yerger’s book, and to view her TED talk, visit

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  • My thanks to Patti Danner for writing such a well researched and comprehensive article about my mission to help other women, so that my story does not become theirs.

    I am looking forward to being back home on March 6th!

    -- Posted by JLYerger on Wed, Feb 12, 2020, at 11:24 AM
  • I'm looking forward to attending this event!

    -- Posted by gdailey1628 on Wed, Feb 12, 2020, at 3:00 PM
  • Such a great story, and such a wonderful mission. Leslie has made us all so proud.

    -- Posted by hoosierma on Wed, Feb 12, 2020, at 7:00 PM
  • Leslie, thank you! I truly enjoyed learning of your endeavors, your mission and your compassionate heart. Your message will touch many and save more lives than you will ever know. See you on the 6th, save me a copy :-)

    -- Posted by pattidanner on Wed, Feb 12, 2020, at 7:33 PM
  • There are a few copies at the Worthington Library for anyone who could not make the book signing.

    Thanks to all - it was good to see everyone!

    -- Posted by JLYerger on Tue, Mar 17, 2020, at 10:07 PM
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