In Atlanta, GA, an 8-year-old boxer named Dixie was treated for a mast cell tumor, according to Atlanta television station 11Alive. Ally Heck, Dixie’s owner, shared her decision to search for STELFONTA after her regular veterinarian saw the tumor and "said we really can't do anything,” Ally says. “So we went to a specialist who said, 'amputate her leg' due to the location of her tumor."1
STELFONTA is indicated for cutaneous mast cell tumors all over the body, and for subcutaneous mast cell tumors distal to the elbow or hock.
Ally says she wanted to see if there was an alternative, so she began to research treatment options for mast cell tumors and she ran across STELFONTA.
Ally eventually found a veterinarian, Dr. Will Gholston, who was open to trying the treatment. "He said I've never heard of that, but I'll do it,” Ally told 11Alive1. “And I think he was the first general vet in our state to be able to do it.”
Ally said Dixie was “off her game for about a week” after the injection. But then she returned to her normal, playful self, getting her boxer wiggle back.1
In a clinical study, Quality of Life (QoL) was assessed by owners rating their dogs in the categories of happiness, mental state, pain, appetite, hygiene, water intake and mobility. The treatment group (81 dogs treated with STELFONTA) were slightly less active and less mobile at day 7 post injection. However at day 14 the QoL scores were equivalent or superior to the control group (42 dogs that were untreated)2.
Ally says the tumor disappeared. “(Her paw has) been tested multiple times and there’s no cancer,” she told the station. “The cancer is dead. It’s gone. There are no words.”1
In a clinical study, 89% of dogs achieving initial complete response at 28 days post treatment were still disease-free at 12 months.3
Appropriate pre- and post-treatment medications must be given, including a corticosteroid plus blocking agents for both H1 and H2 receptors, in order to decrease the potential for severe systemic adverse reactions, including death, from mast cell degranulation.
When Fort Worth, TX resident Laura Bates rescued a six-month-old boxer from a Texas puppy mill, little did she know the rocky road that lay ahead for both of them. Laura and the pup, Scout, bonded immediately and soon the two became inseparable, according to TV station WFAA. “My No. 1 question whenever I go out or over to someone’s house is, 'Can I bring my dog?,’” Bates told the station. “I’m that person.”4
Not long after Scout celebrated her first birthday, a tumor was discovered on her abdomen. Bates acted fast, having the tumor removed surgically. But a little more than a year later, a tumor struck Scout again, this time affecting her paw4. Options, Scout’s veterinarian told her, included chemotherapy, surgery, even amputation, according to WFAA.
There was another possibility, though: Scout’s veterinarian had heard of a canine mast cell tumor treatment called STELFONTA, but she had yet to actually administer it. Bates and her veterinarian began to research STELFONTA. Her veterinarian told her to do her due diligence and research the treatment option and understand the risks involved. Eventually, the two put their heads and notes together and decided to try this treatment.
STELFONTA was injected directly into the mast cell tumor. According to WFAA, the tumor died but an ugly wound was left behind. “They prepare you that it’s going to look worse before it looks better, and I would say it wasn’t the best thing to look at. But that only lasted for about nine days” Bates told the station.4
The wound was soon replaced by skin and hair, and since her treatment, Scout’s been cancer-free.4 You can follow Scout’s adventures on Instagram.
Formation of wounds, possibly extensive, is an intended and likely response to treatment with STELFONTA along with associated swelling, bruising and pain; these wounds are expected to heal.
The old adage, “good things come to those who wait,” can certainly be applied to Bella, a Rhodesian ridgeback stricken with a cancerous mast cell tumor. Bella and her owner, Tracey Kolb of Houston, patiently waited for the FDA to approve STELFONTA, at that time a brand-new cancer treatment, according to the Houston Chronicle5, which ran a story about Kolb’s tireless quest to find a cure for Bella’s cancer.
By the time she turned 10, Bella had already faced off with a number of other ailments, including allergies. But the undiscovered cancer had a crippling effect on Bella’s body. Bella’s veterinarian, Dr. Megan Dunn, found the growth and diagnosed it as a mast cell tumor. "It’s one of the most common skin tumors that dogs can get," she told the Chronicle. “And some can be incredibly aggressive.”5
Kolb, a registered nurse, wanted to use STELFONTA for treatment, but at that point, it had not been approved by the FDA. Kolb circled the day on her calendar when it would come up for review5. After six months, STELFONTA was available and Dr. Dunn treated Bella’s mast cell tumor. Kolb noted that the tumor swelled and was hot for three hours after treatment.
Dr. Dunn told the paper that the “injection has to be paired with the canine equivalents to Pepcid AC and Benadryl, in addition to prednisone”. Because Bella experienced some pain, Dr. Dunn recommends STELFONTA patients be prescribed painkillers. Kolb also told the paper about having to administer “steroids during the treatment to reduce the risk of adverse reactions.”5
Dr. Dunn has treated several dogs since Bella, each of which did well with the medication and made a full recovery5, according to the Chronicle. "As for Bella," Kolb says, "She got her groove back. She’s so energetic,” Kolb said. “She is so much more alive. It’s dramatically changed her. This is an about face.”5
King Louis, a French bulldog in Cypress, TX, avoided amputation of his toe, thanks to the mast cell tumor treatment alternative, STELFONTA, according to a Fox26 story6. His owner, Janette Schulze, was happy to have another choice available from her veterinarian after losing a previous dog, a Yorkie named Elli, to cancer.
A patient of Dr. Darleen Nath of Lakeside Veterinary Care in Houston, King Louis was Dr. Nath’s first patient to try STELFONTA, according to Fox266. Dr. Nath commented on the STELFONTA treatment, stating “after a week into the process you see changes and typically heals up after 28 to 30 days after the injection, and 60 days later, it’s (the tumor area) almost completely back to normal.”6 King Louis received the injection last October, and showed excellent progress, as the tumor dried up and fell off, leaving healthy tissue behind that healed, the station reported.
Dr. Nath said she wants to give her clients a “less-invasive option than traditional mast cell tumor removal surgeries.”6
Challenges that some dogs may face after the treatment include swelling, Dr. Nath told Fox26. “They would be (swollen) even with surgery,” she says.6
STELFONTA must be used in conjunction with required concomitant medications. Due to expected swelling and bruising, an appropriate pain management protocol should be considered.
Dr. Katie Green's beloved pit bull, Hank, developed a MCT at the young age of six. As a veterinarian, Dr. Green already had an inside scoop on how well STELFONTA worked.
Hank had developed the mast cell tumor on his leg, near his paw. “Previously, for a tumor like Hank’s, especially for where it was, we would have looked at removing his leg or (giving him) a long dose of radiation,” Dr. Green told News4 in Jacksonville, FL.7
After STELFONTA was administered to Hank, he was in pain for two days, Dr. Green told News4. “We had him on quite a bit of pain medication, some things to keep him more comfortable,” she told the station. “But after that third day, he didn’t have any issues.”7
The wound healed nicely, too, she said. “It looks really gross, because (the tumor) is just rotting off,” she said to the station. “That was the hardest part for us, watching that process.”7
Treatment with STELFONTA has been associated with cellulitis and severe tissue sloughing extending away from the treated site, resulting in extensive wounds that require additional treatment and prolonged recovery times.
Rella was adopted by Bria Barlow of Gastonia, NC from a local shelter six years ago. Rella is a senior dog so Bria wanted to give her the best quality of life she could; she takes Rella everywhere with her. Last year, Rella had a tumor grow on her back leg. Though it did not seem to interfere with their daily activities, Bria became concerned about the rapid growth of the tumor.
Bria took Rella to Dr. Mark Epstein, who tested the growth and determined it was a mast cell tumor. Dr. Epstein and Bria discussed using STELFONTA as an option to treat Rella’s mast cell tumor.
Dr. Epstein informed Bria that Rella’s tumor,” could not be properly resected in the precarious location on her leg and surgical amputation would be the option for complete removal”8. Bria and Dr. Epstein extensively discussed STELFONTA and the potential risks of treatment. Ultimately, Bria elected to treat Rella’s tumor with STELFONTA, in hopes of saving Rella’s leg.
Rella’s tumor required two injections. Bria was told to expect the tumor to dissolve in a couple of weeks, leaving a hole in its place. The remaining wound would heal via second intention (without surgical closure).
Bria shared her photos with news station Queen City News of Charlotte, NC. Though the station felt the photos were too graphic to share, they aired a segment about Rella’s experience with STELFONTA treatment for her mast cell tumor. The segment discussed the risks involved with STELFONTA use, but also the benefits. Brett Baldweck, the journalist reporting the story, reported STELFONTA had “melted away”8 the mast cell tumor on Rella’s leg, leaving a wound which healed on its own without outside intervention.
Results in STELFONTA patients often vary. Rella, for example, did need a second injection to fully treat her tumor. In the end, Bria reported to the station that she “would definitely recommend it.”8
Ross, K. (2021, October 14). New cancer treatment saves dog's paw, gives hope for medical advancements. 11 Alive. Retrieved May 9, 2022, from https://www.11alive.com/article/news/health/new-cancer-treatment-saves-dogs-paw-gives-hope-for-medical-advancements/85-82b980a6-f7b1-4d57-aa23-4f4f5d327e7e.
Data on File, Virbac Corporation
Jones PD, Campbell JE, Brown G, Johannes CM, Reddell P. Recurrence-free interval 12 months after local treatment of mast cell tumors in dogs using intratumoral injection of tigilanol tiglate. J Vet Intern Med. 2020;1–5.
Woodard, T. (2021, November 17). Doggone survivor: 3-year-old Fort Worth pup beats cancer twice. wfaa chanel 8 CBS. Retrieved April 29, 2022, from https://www.wfaa.com/article/news/local/survivor-3-year-old-fort-worth-puppy-beats-cancer-twice/287-9ebc3d4a-7901-4ee6-8f24-56c712dce716.
Peyton, L. (2021, December 30). What would you do to save your dog? A Houston woman's tireless quest to cure Bella's Cancer. Houston Chronicle. Retrieved April 29, 2022, from www.houstonchronicle.com/lifestyle/article/What-would-you-do-to-save-your-dog-A-Houston-16738063.php.
Geigel, N. (2022, March 8). New FDA approved drug could help cure mast cell tumors in dogs. FOX 26 Houston. Retrieved May 2, 2022, from https://www.fox26houston.com/news/new-fda-approved-drug-could-help-cure-mast-cell-tumors-in-dogs.
News4Jax, Jacksonville, Florida News, WJXT Channel 4. (2022, April 26). Dog cancer free after breakthrough treatment. WJXT. Retrieved April 26, 2022, from https://www.news4jax.com/video/morning-show/2022/04/26/dog-cancer-free-after-breakthrough-treatment/
Baldeck, B., Charlotte, NC, Queen City News. (2022, July 28). New cancer treatment for dogs being used in Gastonia. FOX 46 Charlotte. Retrieved September 9, 2022, from https://www.fox46.com/news/pets-and-animals/new-cancer-treatment-for-dogs-being-used-in-gastonia/
STELFONTA® (tigilanol tiglate injection) is a prescription treatment approved by the FDA for use in dogs, and indicated for:
Tumors must be less than or equal to 10 cm3 in volume, and must be accessible to intratumoral injection.
IMPORTANT SAFETY INFORMATION
Accidental self-injection of STELFONTA® may cause severe wound formation. To decrease the risk of accidental self-injection, sedation of the dog may be necessary. In dogs, do not inject STELFONTA into subcutaneous mast cell tumors located above the elbow or hock. Formation of wounds, possibly extensive, is an intended and likely response to treatment with STELFONTA along with associated swelling, bruising and pain; these wounds are expected to heal. Appropriate pre- and post-treatment medications must be given, including a corticosteroid plus blocking agents for both H1 and H2 receptors, in order to decrease the potential for severe systemic adverse reactions, including death, from mast cell degranulation. For full prescribing information, contact VIRBAC at 1-800-338-3659 or view the Product Insert.
STELFONTA® is a registered trademark of QBiotics Pty Ltd, used under license.