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Tebentafusp-tebn side effects

Generic Name: tebentafusp-tebn

Dosage Form: injection

Brand name: Kimmtrak

Medically reviewed, A Ras MD. Updated on March 24, 2022.

What is Tebentafusp-tebn?

Tebentafusp-tebn side effects are the unwanted reactions that may be experienced while using Tebentafusp-tebn.

This is a prescription medication for adults who are HLA-A*02:01 positive with uveal cancer that can’t be treated surgically or has developed.

Your doctor will check for the presence of the gene HLA-A*02:01 to determine if this medication is appropriate for you. It isn’t known whether this medication can be used safely and effectively for children.

Tebentafusp-tebn is a CD3 T cell engager with a bispecific gp100 peptide-HLA-directed T cell receptor. Tebentafusp-tebn has a molecular weight of about 77 kDa. Tebentafusp-tebn is made in E. coli bacteria using recombinant DNA technology.

Tebentafusp-tebn injection comes as a sterile, preservative-free, clear, colorless, or slightly yellowish solution for intravenous infusion in a single-dose vial.

Tebentafusp-tebn (100 mcg), citric acid monohydrate (0.95 mg), disodium hydrogen phosphate (2.91 mg), mannitol (5 mg), polysorbate 20 (0.1 mg), trehalose (25 mg), and water for injection with a pH of 6.5 are all contained in each single-dose vial.

Mechanism of Action

Tebentafusp-tebn is a bispecific gp100 peptide-HLA-A*02:01 directed T cell receptor CD3 T cell engager. The TCR arm binds to a gp100 peptide presented by human leukocyte antigen-A*02:01 (HLA-A*02:01) on the cell surface of uveal melanoma tumor cells.

In vitro, tebentafusp-tebn bound to HLA-A*02:01-positive uveal melanoma cells and activated polyclonal T cells to release inflammatory cytokines and cytolytic proteins, which results in direct lysis of uveal melanoma tumor cells.

Important information

Tebentafusp-tebn can trigger severe side effects that could be life-threatening. It generally occurs during the very first 3 injections. These adverse effects include:

  • Cytokine Release Syndrome (CRS). Inform your doctor immediately if you experience some of the symptoms listed below:
    • The fever
    • weakness or fatigue
    • vomiting
    • chills
    • nausea
    • Low blood pressure
    • dizziness, lightheadedness, and faintness.
    • headache
    • The wheezing and trouble breathing
    • Rash

Your healthcare provider will test for these issues in the course of treatment. Your healthcare provider could temporarily suspend or stop treatment if you experience serious adverse effects.

Warnings and Precautions

  • Skin reactions: Patients who received this medication had rashes, pruritus, and cutaneous edema. If skin responses occur, treat them according to how long they last and how severe they are.
  • Elevated liver enzymes: Patients taking Tebentafusp-tebn saw an increase in liver enzymes. Keep an eye on your ALT, AST, and total bilirubin levels.
  • Embryo-Fetal Toxicity: This substance has the potential to harm a fetus. Inform patients with reproductive potential about the risk to the fetus and the importance of using effective contraception.

Prior to receiving Tebentafusp-tebn

Before you get Tebentafusp-tebn inform your healthcare provider of the medical conditions you suffer from for example, if you are:

  • You are expecting or planning to become preg. Tebentafusp-tebn may harm your unborn baby. Talk to your healthcare provider when you are pregnant while receiving treatment.

For females who have the potential to get pregnant:

  • Your doctor should conduct the pregnancy test prior to when you begin treatment.
  • Make sure you are using a reliable method of birth control throughout treatment and for at minimum 1 week following the last dose.
  • Are breastfeeding or planning to or plan to. It is unclear whether Tebentafusp-tebn is absorbed into breast milk. Avoid breastfeeding during the treatment period, and at least for a week following the dose, you received.

What other medications can affect Tebentafusp-tebn?

Inform your doctor about the medicines you are taking such as prescription and over-the-counter medications such as vitamins, herbal supplements.

How do I get Tebentafusp-tebn?


  • Tebentafusp-tebn will be delivered to you via infusion intravenous (IV) infusion through your vein for between 15 and 20 minutes.
  • Tebentafusp-tebn is typically given once a week.
  • Your physician will decide what treatments you will require.
  • The healthcare professional will monitor you for a minimum of 16 hours following the initial three treatments, and for a minimum of 30 minutes following any subsequent treatments.
  • Your doctor may delay your treatment if they suffer from specific negative side negative effects.
  • Your doctor may perform routine blood tests as part of your treatment.

Tebentafusp-tebn side effects

Kimmtrak could have serious adverse negative side effects, such as:

  • Read Important details.
  • Skin reactions. Kimmtrak can trigger irritations to your skin, which require medical treatment. Contact your physician whenever you notice reactions to your skin, such as itching, rash, or swelling on your skin, that are serious and don’t go away.
  • Blood tests for abnormal liver function. Your doctor will conduct blood tests to test your liver prior to starting Kimmtrak and throughout treatment. Inform your healthcare provider when you notice signs of liver disorders, for example, the right-sided abdominal pain or the swelling of the eyes or skin.

The most frequent side effects are:

  • Cryokine Release Syndrome (CRS)
  • Rash
  • febrile
  • Itching
  • tiredness
  • nausea
  • chills
  • stomach pain
  • swelling
  • Low blood pressure (symptoms can include dizziness or lightheadedness)
  • dry skin
  • headache
  • vomiting
  • Atypical liver blood test results

Infrequent side effects

  • low amount of albumin proteins in the blood
  • low amount of magnesium in the blood
  • low amount of phosphate in the blood
  • low amount of calcium in the blood
  • anemia
  • decreased blood platelets
  • low levels of a type of white blood cell called neutrophils
  • a decreased number of lymphocytes in the blood
  • high blood pressure
  • high blood levels of the lipase enzyme
  • a high alanine transaminase level
  • a high aspartate transaminase level
  • constipation
  • hair loss
  • hair discoloration
  • skin discoloration
  • decreased pigmentation of the skin
  • joint pain
  • backache
  • muscle spasm
  • muscle pain
  • pain in the arms or legs
  • dizziness
  • flu-like symptoms
  • temporary redness of face and neck
  • decreased appetite
  • diarrhea
  • a feeling of pins and needles on the skin
  • night sweats
  • pain in the oropharynx
  • fast heartbeat

Clinical Trials Experience

Because clinical trials are done under such a wide range of conditions, adverse reaction rates seen in one drug’s clinical trials cannot be directly compared to rates seen in another drug’s clinical trials, and may not reflect rates seen in practice.

First-line metastatic uveal melanoma

  • The safety of KIMMTRAK was assessed in the IMCgp100-202, a randomized (2:1), open-label, active-controlled trial in patients with metastatic or advanced uveal melanoma who had not previously undergone systemic therapy. KIMMTRAK (20 mcg intravenously on Day 1, 30 mcg intravenously on Day 8, 68 mcg intravenously on Day 15, and 68 mcg intravenously thrice a week afterward) or investigator’s choice medication (N=111) were given to patients. Patients who received KIMMTRAK had a median exposure time of 5.3 months (range: 0.3 to 33 months).
  • Patients who got KIMMTRAK experienced serious side effects in 28% of cases. Cytokine release syndrome (10%), rashes (4.5%), pyrexia (2.4%), and hypotension (2.4%) were serious adverse reactions that occurred in less than 2% of patients (2 percent ). One patient (0.4%) died as a result of an adverse reaction (pulmonary embolism).
  • In 3.3 percent of patients who received KIMMTRAK, adverse events led to permanent cessation. Anaphylactic reaction, cerebral edema, cytokine release syndrome, tiredness, hepatotoxicity, hypotension, and nausea were among the side effects that led to the permanent discontinuation of KIMMTRAK (each 0.4 percent ).
  • Patients who got KIMMTRAK had 25 percent of their doses interrupted due to adverse effects. Fatigue (3.7%), lipase rise (2.9%), pyrexia (2.4%), alanine aminotransferase increase (2%), and aspartate aminotransferase increase (2%) were among the adverse responses that needed dosage stoppage in less than 2% of patients (2 percent ).
  • In 5% of individuals who received KIMMTRAK, adverse events resulted in a dose reduction. Cytokine release syndrome (2.4 percent) and rashes (1.4 percent) were two adverse events that necessitated dosage modification in less than 2% of patients (2 percent ).
  • Cytokine release syndrome, rash, pyrexia, pruritus, exhaustion, nausea, chills, abdominal discomfort, edema, hypotension, dry skin, headache, and vomiting were the most prevalent adverse effects in patients who received KIMMTRAK (30 percent). Reduced lymphocyte count, increased creatinine, increased glucose, increased AST, increased ALT, decreased hemoglobin, and decreased phosphate were the most common laboratory abnormalities in patients who received KIMMTRAK (50 percent).

TABLE 1 summarizes the adverse reactions observed in study IMCgp100-202.

Table 1: Adverse Reactions (≥20%) in Patients with Metastatic Uveal Melanoma Who Received KIMMTRAK in Study IMCgp100-202

a Represents algorithmic identification of CRS cases based on ASTCT grading criteria (Lee et al. 2019).
b Represents a composite of multiple related terms.
Side effects KIMMTRAK
Investigator’s Choice (pembrolizumab, or ipilimumab, or dacarbazine)
All Grades
Grade 3 or 4
All Grades
Grade 3 or 4
Immune system disorders
Cytokine release syndrome 89 0.8 2.7 0
Skin and subcutaneous tissue disorders
Rash 83 18 28 0
Pruritus 69 4.5 23 0
Dry skin 31 0 3.6 0
Skin Hypopigmentationb 28 NA 5 NA
Erythema 24 0 0.9 0
Hair color changes 20 NA 0 NA
General disorders and administration site conditions
Pyrexia 76 3.7 7 0.9
Fatigue 64 6 42 0.9
Chills 48 0.4 3.6 0
Edem 45 0 10 0
Gastrointestinal disorders
Nausea 49 2 26 0.9
Abdominal pain 45 2.9 33 3.6
Vomiting 30 1.2 9 0
Diarrhea 25 1.2 20 2.7
Vascular disorders
Hypotension 39 3.3 2.7 0
Nervous system disorders
Headache 31 0.4 10 0.9
Musculoskeletal and connective tissue disorders
Arthralgia 22 0.8 16 0


Clinically relevant adverse reactions occurring in < 20% of patients who received KIMMTRAK included back pain, decreased appetite, constipation, hypertension, tachycardia or sinus tachycardia, dyspnea, paresthesia, dizziness, flushing, muscle spasms, myalgia, pain in extremity, alopecia, skin hyperpigmentation, influenza-like illness, oropharyngeal pain, and night sweats.

Table 2 summarizes the selected laboratory abnormalities observed in study IMCgp100-202.

Table 2: Selected Laboratory Abnormalities (≥ 10%) worsening from baseline in patients who received KIMMTRAK versus Investigator’s Choice
Alk Phos = Alkaline Phosphatase; AST=aspartate aminotransferase; ALT=alanine aminotransferase
a The denominator used to calculate the rate varied from 242 to 245 for KIMMTRAK and 105 to 109 for IC based on the number of patients with a baseline value and at least one post-treatment value for the laboratory assessment.
Investigator’s Choice(pembrolizumab, or ipilimumab, or dacarbazine)
Grades 1-4
Grades 3-4
Grades 1-4
Grades 3-4
Lymphocyte count decreased 91 56 26 1.8
Hemoglobin decreased 51 0.8 20 0.9
Platelet count decreased 16 0 15 0.9
Neutrophil count decreased 14 2 8 1.8
Creatinine increased 87 0.4 73 0
Glucose increased 66 3.3 39 4.6
AST increased 55 13 39 1.9
ALT increased 52 9 29 1.8
Phosphate decreased 51 11 20 2
Albumin decreased 47 2.1 14 0.9
Calcium decreased 45 1.6 15 1.9
Lipase increased 37 15 28 6
Magnesium decreased 34 0 8 0
Alk phos increased 34 2.9 36 1.8
Sodium decreased 30 2.9 15 0.9
Potassium increased 29 1.6 15 0.9
Bilirubin increased 27 4.1 14 7
Amylase increased 23 4.1 18 1
Glucose decreased 18 0.4 4.6 0
Potassium decreased 17 0.8 8 0.9
Calcium increased 13 0 3.7 0


  • Immunogenicity is a possibility with all therapeutic proteins. The sensitivity and specificity of the assay are critical in detecting antibody production. Furthermore, various factors such as assay methodology, sample handling, sample collection time, concomitant drugs, and underlying disease may influence the recorded incidence of antibody (including neutralizing antibody) positive in an assay. As a result, comparing the incidence of antibodies in the research reported below to the incidence of antibodies in other studies or to the incidence of antibodies in other products may be misleading.
  • In studies IMCgp100-102 and IMCgp100-202, treatment-emergent anti-drug antibodies (ADA) against tebentafusp-tebn were found in 33 percent and 29 percent of patients receiving tebentafusp-tebn, respectively, across all dosages. After tebentafusp-tebn therapy, the median period for ADA development was 6-9 weeks. It is unknown whether these binding ADAs can neutralize tebentafusp-tebn. In patients with high titer ADAs, tebentafusp-tebn clearance increased. Based on preliminary findings, the creation of ADA does not appear to have a clinically meaningful effect on the incidence or severity of hypersensitivity-related adverse responses, and there is no evidence of a reduction in overall survival.

There are many possible adverse negative effects. Contact your physician to get medical advice on possible side effects. You can report adverse reactions to the FDA via 1-800-FDA1088..

General information regarding the safe and efficient use of Kimmtrak.

Some medicines are used for reasons other than those mentioned in a Patient Information Leaflet. If you’d like more information, speak to your healthcare professional. You could ask your healthcare professional for additional information specifically written for healthcare professionals.

How supplied

Each KIMMTRAK (tebentafusp-tebn) injection carton (NDC 80446-401-01) contains:

  • One single-dose vial containing 100 mcg of tebentafusp-tebn in 0.5 mL of sterile, preservative-free, clear, colorless, or slightly yellowish solution.

The vial stopper is not made with natural rubber latex.

Storage and Handling

  • Store KIMMTRAK vials in the original carton refrigerated at 2°C to 8°C (36°F to 46°F) and protect from light until time of use. Do not freeze. Do not shake.


  • 80446-401-01 – 100 mcg/0.5 mL Carton Label

Tebentafusp-tebn side effects

  • 80446-401-01 – 100 mcg/0.5 mL Vial Label


Additional details

Always consult your doctor to make sure the information presented on this site is appropriate to your particular situation.



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