You’ve more than likely heard of Elagolix, but have you heard of Relugolix? It’s a GnRH antagonist. And, yes, it’s the same classification of drug as Abbvie’s Elagolix (aka Orlissa). It’s being groomed to treat fibroids, prostate cancer, and (yep, you guessed it) Endometriosis pain.
Although not yet approved here in the United States, Japan approved Relugolix in January 2019 to treat uterine fibroids under the name Relumina. According to an Amsterdam company, TheSocialMedNework, Relumina is available for $1,400 for a box of 100 tablets (the standard dosage is one 40-mg tablet per day). I’m curious how that price rate would change in the United States if it were ever approved. It is expected that the FDA will receive an application for approval to treat uterine fibroids later this year.
And there’s an interesting race between Myovant Sciences and Abbvie. Elagolix (Orilissa) was approved last year to treat Endometriosis pain, but Abbvie will be seeking FDA approval for it to treat uterine fibroids as well. Myovant will be seeking FDA approval for Relagolix to treat uterine fibroids…and eventually Endometriosis pain. The race is on!
Common side effects include (I consider this list incomplete and will continue to search for information):
- hot flashes
- irregular uterine bleeding
- heavy menstrual bleeding
- excessive sweating
- genital bleeding
- liver function disorder
In 2016, it was reported (in the US Exchange & Securities Registration Statement) that out of 1,300 trial subjects, there were a total of 36 serious adverse events. Of those 36: “one event of abnormal liver function tests, one of cerebral infarction, and one of embolic stroke.” The investigator noted those three events may have been “possibly related to Relugolix.” Dr. Google tells me that cerebral infarction and embolic stroke have to do with a blockage of the blood supply to the brain.
Myovant Sciences is working on developing Relugolix in combination with estradiol and progestins to ease side effects and prevent bone loss. In the US Exchange & Securities Registration Statement by Myovant on July 8, 2016, they identify Relugolix as their “lead product candidate” and outline their prospective trial timetable. Myovant appears to be a small fish in the pharmaceutical sea with not a lot of products under their belt.
Clinical trials are ongoing around the world for its effectiveness against fibroids, endometriosis symptoms, and prostate cancer. The study for endometriosis is called Spirit. More information can be found on MySpiritStudy.
Following is a timeline of clinical trials of Relugolix pertaining to Endometriosis:
October 2011: Efficacy and Safety of TAK-385 (Relugolix) in the Treatment of Endometriosis. This study concluded in August of 2013, with 487 participants and tested the drug for 12 weeks or more in 10, 20, and 40mg doses, as well as had a placebo and Lupron Depot injections as comparison. It completed in August of 2013.
March 2012: A Long-term extension study of TAK-385 (Relugolix) in the Treatment of Endometriosis. This study had 397 participants and tested the drug for 12 weeks or more in 10, 20, and 40mg doses, as well as had a placebo and Lupron Depot injections as comparison. It completed in December 2013.
November 2017 and December 2017: Spirit 1 and Spirit 2: Efficacy and Safety Study of Relugolix in Women with Endometriosis-Associated Pain. Still actively recruiting, these study hope to conclude by June 2020. They seek to have at least 1,200 participants testing Relugolix for 24 weeks; some with the drug and added estradiol/progestins; and others with Relugolix and placebo.
May 2018: Spirit Extension: Efficacy and Safety Extension Study of Relugolix in Women with Endometriosis-Associated Pain. This study is ongoing (by invitation only) and expected to be complete in mid-2022. They are hoping to have at least 800 participants to evaluate 40mg Relugolix in combination with estradiol and norethindrone acetate for up to 28 weeks.
May 2019: Clinical Study to Evaluate Efficacy of TAK-385 40mg Compared with Leuprorelin in Patients with Endometriosis. Presently recruiting, this study wants to have 320 participants and compare Relugolix to Lupron Depot for 24 weeks. They hope to have this study completed by early 2021.
Studies have shown that women have reported less pelvic pain when taking 40mg of Relugolix compared to the placebo.
If you’ve participated in these studies, please respect the non-disclosure agreements I’m sure you had to sign and refrain from commenting on your experience. Although I am mightily curious! But, I absolutely respect the NDAs.
I look forward to more information becoming available on the clinical trial outcomes, and a more thorough identification of the adverse side effects. Will I use it? More than likely not just because of the nature of the beast that it is. Lupron was similar…and was not a pleasant journey for me. But will I dissuade you from trying it IF it ever hits our shelves. Never. I’ll simply ask you to do your research first.
And, an interesting update: On December 18, 2020, the FDA approved relugolix (aka Orgovyx) to treat advanced prostate cancer. Reminds me of … other Endometriosis “treatments”….Lupron anyone? Hopefully the clinical trials will reveal more about the side effects Relugolix has with Endometriosis patients.
**Updated December 18, 2020**
Biopharmadive – Myovant Reports a Phase 3 Success, but Wall Street Isn’t Cheered
Biopharmadive – Myovant Set to Battle Abbvie After Second Phase 3 Success for Key Drug
Drugs (Abstract; April 2019) – Relugolix: First Global Approval
Endometriosis News – Relugolix
Myovant Sciences – Relugolix
Roivant Sciences (Article; May 2017) Myovant Sciences Announces Presentation of Positive Phase 2 Date for Relugolix in Women with Endometriosis-Associated Pain at the World Congress on Endometriosis
TheSocialMedNetwork – Relumina
US Food & Drug Administration – FDA Approves First Oral Hormone Therapy for Treating Advanced Prostate Cancer
US Securities and Exchange Commission – Myovant Sciences, Ltd’s Registration Statement
Wikipedia – Relugolix
~ Again, I am a layman. I do not hold any college degrees, nor mastery of knowledge. Please take what I say with a grain of salt. If curious, do your own research. Validate my writings. Or challenge them. And ALWAYS feel free to consult with your physician. Always. Yours ~ Lisa