GOMEKLI (mirdametinib)

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A debilitating and life-changing condition

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About neurofibromatosis type 1 with plexiform neurofibromas (NF1-PN)

  • Neurofibromatosis type 1 (NF1) is an incurable genetic condition caused by loss-of-function variants in the NF1 tumor-suppressor gene1-4
  • Nonmalignant peripheral nerve sheath tumors called plexiform neurofibromas (PNs) are a common clinical manifestation of NF11

Up to 50%

of children and adults with NF1 develop PNs1,5,6

There are 30,000 to 50,000 people in the US living with NF1-PN, and the majority of them are adults1,5-8

NF1-PN can be associated with significant physical morbidities6,9-11

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Pain

(most common symptom)
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Impaired mobility

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Changes in
appearance

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Compression of
internal organs

  • Two of the most frequently reported concerns for patients across all age groups are pain and changes in appearance12,*
  • For children and adolescents, pain has been found to significantly impact their lives, even when pain medications are used13,†
  • Patients with NF1 have an 8% to 16% lifetime risk of PNs transforming into malignant peripheral nerve sheath tumors14,15
  • PNs can grow anywhere on the body except for the central nervous system; the most common location is the head and neck area, followed by the extremities and trunk5,9,16,17
  • PNs can grow at an unpredictable rate, and there may be periods of rapid growth followed by periods of relative inactivity18-21
X-ray image of a 7-year-old girl with a large PN on her neck.
Image of a 7-year-old girl with a large PN on her neck.

7-year-old girl with a large PN on her neck. Imagery adapted from Wise et al, 2005.22

*Based on a qualitative study in which clinicians (n=8), NF1-PN patients aged 5 years and older (n=31), and parents of NF1-PN patients aged 5 to 17 years (n=17) were interviewed for the purpose of determining which PN-related symptoms and concerns should be considered the most important to assess.12

 †Based on a questionnaire completed by the caregivers of 59 NF1-PN patients, 6 to 18 years of age, and 41 NF1-PN patients, 10 to 18 years of age, who were enrolled in an NF1 natural history study at the National Cancer Institute.13

Surgery to manage NF1-PN is not always feasible and outcomes can be variable

  • Debulking surgery may be considered for large PNs that are interfering with vital structures, including the airway or spinal cord, or for PNs that could lead to functional decline or changes in appearance23,24
  • However, the feasibility of surgery can be restricted by tumor site or infiltration of surrounding nerves and vasculature25

Up to ~85% of PNs

are not amenable to complete resection1,25,26

23% of PNs

regrow after a complete resection27,‡
  • In a survey, 16% (5/32) of patients with NF1-PN who received debulking surgery reported complications11,§
    • Of the patients assessed for surgical complications associated with debulking surgery, 9% (3/32) experienced acute surgical complications, including delayed healing and bleeding, and 6% (2/32) experienced chronic postoperative symptoms, such as functional impairment and nerve damage
  • In a retrospective analysis, lasting postoperative complications were seen in 18% (17/96) of patients5,||

‡Based on a retrospective analysis of clinical and MRI data of 52 children and adults with NF1 who had surgery to remove PNs at a referral center in Germany.27

§Based on a cross-sectional study using a one-time survey of NF1-PN patients and caregivers. Sixty-one pediatric patients 8 to 18 years old and their caregivers, and 21 additional caregivers of patients 2 to 7 years old (total of 82 caregivers) participated in the survey.11

∥Based on a retrospective analysis of 96 children with NF1 who had PN surgery at a single center located in the US.5

MEK=mitogen-activated protein kinase kinase; MRI=magnetic resonance imaging.

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About GOMEKLI

GOMEKLI inhibits MEK1/2, key mediators in the MAPK pathway.28,29
Learn more

Indication

GOMEKLI (mirdametinib) is indicated for the treatment of adult and pediatric patients 2 years of age and older with neurofibromatosis type 1 (NF1) who have symptomatic plexiform neurofibromas (PN) not amenable to complete resection.

Important Safety Information

Warnings and Precautions

Ocular Toxicity: GOMEKLI can cause ocular toxicity including retinal vein occlusion (RVO), retinal pigment epithelium detachment (RPED), and blurred vision. In the adult pooled safety population, ocular toxicity occurred in 28% of patients treated with GOMEKLI: 21% were Grade 1, 5% were Grade 2 and 1.3% were Grade 3. RVO occurred in 2.7%, RPED occurred in 1.3%, and blurred vision occurred in 9% of adult patients. In the pediatric pooled safety population, ocular toxicity occurred in 19% of patients: 17% were Grade 1 and 1.7% were Grade 2. Conduct comprehensive ophthalmic assessments prior to initiating GOMEKLI, at regular intervals during treatment, and to evaluate any new or worsening visual changes such as blurred vision. Continue, withhold, reduce the dose, or permanently discontinue GOMEKLI as clinically indicated.

Left Ventricular Dysfunction: GOMEKLI can cause left ventricular dysfunction. GOMEKLI has not been studied in patients with a history of clinically significant cardiac disease or LVEF <55% prior to initiation of treatment. In the ReNeu study, decreased LVEF of 10 to <20% occurred in 16% of adult patients treated with GOMEKLI. Five patients (9%) required dose interruption, one patient (1.7%) required a dose reduction, and one patient required permanent discontinuation of GOMEKLI. The median time to first onset of decreased LVEF in adult patients was 70 days. Decreased LVEF of 10 to <20% occurred in 25%, and decreased LVEF of ≥20% occurred in 1.8% of pediatric patients treated with GOMEKLI. One patient (1.8%) required dose interruption of GOMEKLI. The median time to first onset of decreased LVEF in pediatric patients was 132 days. All patients with decreased LVEF were identified during routine echocardiography, and decreased LVEF resolved in 75% of patients. Before initiating GOMEKLI, assess ejection fraction (EF) by echocardiogram. Monitor EF every 3 months during the first year and then as clinically indicated. Withhold, reduce the dose, or permanently discontinue GOMEKLI based on severity of adverse reaction.

Dermatologic Adverse Reactions: GOMEKLI can cause dermatologic adverse reactions including rash. The most frequent rashes included dermatitis acneiform, rash, eczema, maculo-papular rash and pustular rash. In the pooled adult safety population, rash occurred in 92% of patients treated with GOMEKLI (37% were Grade 2 and 8% were Grade 3) and resulted in permanent discontinuation in 11% of patients. In the pooled pediatric safety population, rash occurred in 72% of patients treated with GOMEKLI (22% were Grade 2 and 3.4% were Grade 3) and resulted in permanent discontinuation in 3.4% of patients. Initiate supportive care at first signs of dermatologic adverse reactions. Withhold, reduce the dose, or permanently discontinue GOMEKLI based on severity of adverse reaction.

Embryo-Fetal Toxicity: GOMEKLI can cause fetal harm when administered to a pregnant woman. Verify the pregnancy status of females of reproductive potential prior to the initiation of GOMEKLI. Advise pregnant women and females of reproductive potential of the potential risk to a fetus. Also advise patients to use effective contraception during treatment with GOMEKLI and for 6 weeks after the last dose (females) or 3 months after the last dose (males).

Adverse Reactions

The most common adverse reactions (>25%) in adult patients were rash (90%), diarrhea (59%), nausea (52%), musculoskeletal pain (41%), vomiting (38%), and fatigue (29%). Serious adverse reactions occurred in 17% of adult patients who received GOMEKLI. The most common Grade 3 or 4 laboratory abnormality (>2%) was increased creatine phosphokinase.

The most common adverse reactions (>25%) in pediatric patients were rash (73%), diarrhea (55%), musculoskeletal pain (41%), abdominal pain (39%), vomiting (39%), headache (34%), paronychia (32%), left ventricular dysfunction (27%), and nausea (27%). Serious adverse reactions occurred in 14% of pediatric patients who received GOMEKLI. The most common Grade 3 or 4 laboratory abnormalities (>2%) were decreased neutrophil count and increased creatine phosphokinase.

Use in Specific Populations

Verify the pregnancy status of patients of reproductive potential prior to initiating GOMEKLI. Due to the potential for adverse reactions in a breastfed child, advise patients not to breastfeed during treatment with GOMEKLI and for 1 week after the last dose.

Indication

GOMEKLI (mirdametinib) is indicated for the treatment of adult and pediatric patients 2 years of age and older with neurofibromatosis type 1 (NF1) who have symptomatic plexiform neurofibromas (PN) not amenable to complete resection.
To report SUSPECTED ADVERSE REACTIONS, contact SpringWorks Therapeutics Inc. at 1-888-400-7989 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Please click here for full Prescribing Information, including Patient Information and Instructions for Use.
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  8. U.S. population estimated at 332,403,650 on Jan. 1, 2022. U.S. Department of Commerce. January 6, 2022. Accessed April 16, 2024. https://www.commerce.gov/news/blog/2022/01/us-population-estimated-332403650-jan-1-2022
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  10. Gross AM, Singh G, Akshintala S, et al. Association of plexiform neurofibroma volume changes and development of clinical morbidities in neurofibromatosis 1. Neuro Oncol. 2018;20(12):1643-1651.
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  12. Lai J-S, Jensen SE, Patel ZS, Listernick R, Charrow J. Using a qualitative approach to conceptualize concerns of patients with neurofibromatosis type 1 associated plexiform neurofibromas (pNF) across the lifespan. Am J Med Genet A. 2017;173(1):79-87.
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  14. Higham CS, Dombi E, Rogiers A, et al. The characteristics of 76 atypical neurofibromas as precursors to neurofibromatosis 1 associated malignant peripheral nerve sheath tumors. Neuro Oncol. 2018;20(6):818-825.
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  16. Plotkin SR, Bredella MA, Cai W, et al. Quantitative assessment of whole-body tumor burden in adult patients with neurofibromatosis. PLoS One. 2012;7(4):e35711.
  17. Nguyen R, Kluwe L, Fuensterer C, Kentsch M, Friedrich RE, Mautner V-F. Plexiform neurofibromas in children with neurofibromatosis type 1: frequency and associated clinical deficits. J Pediatr. 2011;159(4):652–655.e2.
  18. Ferner RE, Huson SM, Thomas N, et al. Guidelines for the diagnosis and management of individuals with neurofibromatosis 1. J Med Genet. 2007;44(2):81-88.
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  20. Ly KI, Merker VL, Cai W, et al. Ten-year follow-up of internal neurofibroma growth behavior in adult patients with neurofibromatosis type 1 using whole-body MRI. Neurology. 2023;100(7):e661-e670.
  21. Nguyen R, Dombi E, Widemann BC, et al. Growth dynamics of plexiform neurofibromas: a retrospective cohort study of 201 patients with neurofibromatosis 1. Orphanet J Rare Dis. 2012:7:75.
  22. Wise JB, Cryer JE, Belasco JB, Jacobs I, Elden L. Management of head and neck plexiform neurofibromas in pediatric patients with neurofibromatosis type 1. Arch Otolaryngol Head Neck Surg. 2005;131(8):712-718.
  23. Fisher MJ, Blakeley JO, Weiss BD, et al. Management of neurofibromatosis type 1-associated plexiform neurofibromas. Neuro Oncol. 2022;24(11):1827-1844.
  24. Armstrong AE, Belzberg AJ, Crawford JR, Hirbe AC, Wang ZJ. Treatment decisions and the use of MEK inhibitors for children with neurofibromatosis type 1-related plexiform neurofibromas. BMC Cancer. 2023;23(1):553.
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  27. Nguyen R, Ibrahim C, Friedrich RE, Westphal M, Schuhmann M, Mautner V-F. Growth behavior of plexiform neurofibromas after surgery. Genet Med. 2013;15(9):691-697.
  28. GOMEKLI. Prescribing Information. SpringWorks Therapeutics, Inc.
  29. Cheng Y, Tian H. Current development status of MEK inhibitors. Molecules. 2017;22(10):1551.