Waldron has already lived considerably longer she turns 19 on March 1. She credits lonafarnib, an experimental medication shes taken since 2007 in clinical trials at Boston Childrens Hospital. A California drug firm plans to complete its application for approval by March 31, with the hope of a favorable ruling from the Food and Drug Administration by years end. It would be the first approved drug for the ultra-rare disease.

Its been proven that it helps in extending life, Waldron, a Deerfield native, said recently over hot chocolate at Caffe Nero near Emerson. Im almost 19. The life span is technically 14. A winsome smile brightened her face. Looks like its doing a good job.

Since 2007, Childrens Hospital has run four clinical trial of lonafarnib. Waldron has participated in all four, and researchers say the results are encouraging.

In perhaps the most compelling finding, a study published by the Journal of the American Medical Association in 2018 reported that children with progeria who took lonafarnib capsules twice a day had a dramatically lower mortality rate than those who didnt.

After slightly more than two years, one in 27 children who took lonafarnib, or 3.7 percent, had died compared with nine in 27 who didnt get it, or 33 percent, according to the article by a team of researchers from the Progeria Research Foundation, Brown University, and Childrens Hospital. Lonafarnib appeared to slow the progression of cardiovascular disease, although it had little or no effect on other symptoms, including stiff joints, stunted growth, wrinkled skin, and loss of body fat and hair.

The data looks fantastic, said Dr. Leslie Gordon, lead author of the JAMA study and medical director and cofounder of the Progeria Research Foundation, the Peabody-based nonprofit that funded the trials. Youve got a fatal childhood disease with no treatment, and youve shown a survival benefit.

For Gordon, a professor of pediatric medicine at Browns medical school who practices at Boston Childrens Hospital and Hasbro Childrens Hospital in Providence, the quest to treat progeria is profoundly personal.

Her son, Sam Berns, a Foxborough High School junior, died of progeria in 2014 at age 17. Like Waldron, he began taking lonafarnib in 2007 in the clinical trials. An avid sports fan who played the snare drum in the Foxborough High School marching band, he was the subject of the 2013 HBO documentary Life According to Sam.

Gordon had never heard of progeria when Sam, her only child, was diagnosed with it at 22 months. She has since become an authority. In 2003, she was on the research team led by Dr. Francis S. Collins, director of the National Institutes of Health, that discovered the defective gene that causes the disease. She cofounded the progeria foundation with her husband and sister.

The genetic mutation that causes progeria results in an overabundance of the protein progerin. A buildup of progerin occurs within a cell in normal aging, but the rate of accumulation is dramatically accelerated in children with the disease. Progeria has no effect on a childs intellect, as anyone who meets Waldron who took an Advanced Placement class in European history in high school and rhapsodizes about Michelangelo can tell in an instant.

Lonafarnib was originally developed by the pharmaceutical giant Merck as a potential treatment for cancer. But researchers found that it can reverse an abnormality in cells of laboratory mice with progeria. Merck has licensed it to Eiger BioPharmaceuticals, a small drug maker in Palo Alto, Calif. David Cory, chief executive of Eiger, says the company has hired a chief commercial officer and a vice president of medical affair in anticipation of FDA approval.

Researchers are working on other potential treatments, including one that targets the genetic root of the disease. David Liu, a chemistry professor affiliated with the Broad Institute, Harvard University, and the Howard Hughes Medical Institute, recently announced that he and a team of scientists had used a new form of genome editing to correct the DNA mutation that caused the disorder in mice, extending their lives.

Waldron, who serves as an ambassador for the progeria foundation, said she was diagnosed with the disease when she was about 2. Her mother, a housekeeper at an assisted living facility, and her father, a solar energy contractor, were worried because she wasnt growing or gaining weight, and her hair was falling out.

Waldron realized she had progeria as an adolescent when she went on the foundations website and saw pictures of kids who looked like her, she said.

Obviously, I knew that I was different before that, she said. But it wasnt an awareness I-have-progeria thing until at a certain point.

The disease has hardly stopped her. She ran for the cross-country and track teams at the public Frontier Regional High School in Deerfield. She played violin in the middle school orchestra and cello in the high school orchestra.

She has met about a dozen other children with progeria from around the country at family weekends at the nonprofit Hole in the Wall Gang Camp in Connecticut for seriously ill children and their families.

When she started considering colleges, Waldron said, she had no interest in going to school in Boston. But she fell in love with the city on a visit to Emerson.

You can walk down the street or hop on a train and go anywhere, she said, citing the North End as one of her favorites places.

I have great friends," she added. "I always have.

Emerson has made several accommodations for her. For example, the college provides a stool for her to rest her feet on when she sits at a desk in her four classes. The handle on her wardrobe in her dorm room was lowered so she could reach it more easily.

Waldron says she generally feels fine despite problems with her joints. She has dislocated her right shoulder four times doing ordinary tasks, such as reaching for a light switch.

None of this has dimmed her spirit for adventure.

Meghan has a very strong personality. Shes driven, her father, Bill Waldron, said in a video posted last year on the progeria foundations Facebook page. I dont think she pays attention to the fact that she has progeria.

Indeed, after graduating from high school in June, she traveled in Europe alone for a month. The initial attraction was seeing Anne-Marie, a singer and occasional Ed Sheeran collaborator, perform in London. But Waldron decided she also wanted to experience Renaissance art. She visited Milan, Florence, Rome, Paris, and Dublin, staying in youth hostels along the way.

Waldrons parents were nervous, she said. She was, too, but only briefly.

There was a point of about five minutes when my parents said goodbye and I was getting on the plane where I started freaking out, she said, laughing. But then I was like, Oh, well. And then I was fine.

Jonathan Saltzman can be reached at jonathan.saltzman@globe.com

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Emerson College student with progeria heartened that first drug treatment could be approved soon - The Boston Globe