trastuzumab deruxtecan (Rx)

Brand and Other Names:Enhertu, fam-trastuzumab deruxtecan-nxki
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Dosing & Uses

AdultPediatric

injection, lyophilized powder for reconstitution

  • 100mg/vial

Breast Cancer

Indicated for unresectable or metastatic HER2-positive breast cancer in adults who have received ≥2 prior anti-HER2-based regimens in the metastatic setting

Do not substitute for or with trastuzumab or ado-trastuzumab emtansine

5.4 mg/kg IV q3Weeks (21-day cycle)

Continue until disease progression or unacceptable toxicity

Gastric Cancer

Indicated for locally advanced or metastatic HER2-positive gastric or gastroesophageal junction (GEJ) adenocarcinoma in adults previously treated with a trastuzumab-based regimen

6.4 mg/kg IV q3Weeks (21-day cycle)

Continue until disease progression or unacceptable toxicity

Dosage Modifications

Do not re-escalate dose after a dose reduction is made

Dose reduction

  • Breast cancer
    • First dose reduction: 4.4 mg/kg
    • Second dose reduction: 3.2 mg/kg
    • Further dose reduction required: Discontinue treatment
  • Gastric cancer
    • First dose reduction: 5.4 mg/kg
    • Second dose reduction: 4.4 mg/kg
    • Further dose reduction required: Discontinue treatment

Interstitial lung disease (ILD)/pneumonitis

  • Asymptomatic ILD/pneumonitis (Grade 1)
    • Interrupt dose until resolved to Grade 0
    • Resolved in ≤28 days from date of onset: Maintain dose
    • Resolved in >28 days from date of onset: Reduce dose 1 level
    • Consider corticosteroid treatment as soon as ILD/pneumonitis is suspected
  • Symptomatic ILD/pneumonitis (Grade ≥2)
    • Permanently discontinue
    • Promptly initiate corticosteroid treatment as soon as ILD/pneumonitis suspected

Thrombocytopenia

Grade 3 (platelets 25 to <50 x 109/L): Interrupt dose until resolved to Grade ≤1, then maintain dose

Grade 4 (platelets <25 x 109/L): Interrupt dose until resolved to Grade ≤1, reduce dose by 1 level

Neutropenia

  • Grade 3 (0.5 to <1 x 109/L): Interrupt until resolved to Grade ≤2, then maintain dose
  • Grade 4 (<0.5 x 109/L): Interrupt until resolved to Grade ≤2; reduce dose by 1 level

Febrile neutropenia

  • ANC <1 x 109/L and temperature >38.3ºC or sustained temperature of ≥38ºC for >1 hr
  • Interrupt dose until resolved, then reduce to 1 dose level

Left ventricular dysfunction (LVEF)

  • LVEF >45% and absolute decrease from baseline is 10-20%: Continue with treatment
  • LVEF 40-45% and absolute decrease from baseline is <10%: Continue treatment; repeat LVEF assessment within 3 weeks
  • LVEF 40-45% and absolute decrease from baseline is 10-20%: Repeat LVEF assessment within 3 weeks; permanently discontinue treatment (if LVEF has not recovered to within 10% from baseline) OR resume at the same dose (if LVEF recovers to within 10% from baseline)
  • LVEF <40% or absolute decrease from baseline is >10%: Interrupt dose; repeat LVEF assessment within 3; if LVEF of <40% or absolute decrease from baseline of > 20% is confirmed, permanently discontinue treatment
  • Symptomatic congestive heart failure (CHF): Permanently discontinue

Renal impairment

  • Mild or moderate (CrCl 30 to <90 mL/min): No dose adjustment necessary
  • Severe (CrCl <30 mL/min): No data are available

Hepatic impairment

  • Mild (total bilirubin [TB] ≤ULN and any AST >ULN or TB >1-1.5x ULN and any AST): No dose adjustment
  • Moderate (TB >1.5-3x ULN and any AST): No dose adjustment; due to potentially increased exposure, closely monitor for increased toxicities related to the topoisomerase inhibitor, DXd
  • Severe (TB >3 to 10x ULN and any AST): No data available

Dosing Considerations

Do not substitute for or with trastuzumab or ado-trastuzumab emtansine

Patient selection

  • Select patients on HER2 overexpression or gene amplification
  • Reassess HER2 status if able to obtain a new tumor specimen after prior trastuzumab-based therapy and before initiation
  • Information on FDA-approved tests is available at: http://www.fda.gov/CompanionDiagnostics

Safety and efficacy not established

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Adverse Effects

>10%

WBC decreased (70%)

Hgb decreased (70%)

Neutrophil count decreased (62%)

Fatigue (59%)

Alopecia (46%)

AST increased (14-41%)

ALT increased (10-38%)

Platelet count decreased (37%)

Decreased appetite (32%)

Anemia (31%)

Neutropenia (28%)

Hypokalemia (26%)

Leukopenia (22%)

Thrombocytopenia (20%)

Headache (19%)

Neutropenia (16%)

Upper respiratory tract infection (15%)

Dye eye (11%)

1-10%

Rash (10%)

Dizziness (10%)

Grade (3 or 4)

  • Anemia (7%)
  • WBC decreased (7%)
  • Hgb decreased (7%)
  • Fatigue (6%)
  • Leukopenia (6%)
  • Hypokalemia (3-3.4%)
  • Thrombocytopenia (3.4%)
  • Interstitial lung disease (2.6%)
  • Infusion-related reactions (2.6%)
  • Febrile neutropenia (1.7%)
  • Decreased appetite (1.3%)
  • Dyspnea (1.3%)

<1%

Grade (3 or 4)

  • AST increased (0.9%)
  • ALT increased (0.4-0.9%)
  • Dry eye (0.4%)
  • Alopecia (0.4%)
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Warnings

Interstitial lung disease and pneumonitis

  • Interstitial lung disease (ILD) and pneumonitis, including fatal cases, reported
  • Monitor for, and, promptly investigate signs and symptoms including cough, dyspnea, fever, and other new or worsening respiratory symptoms
  • Permanently discontinue in all patients with Grade 2 or higher ILD/pneumonitis
  • Advise patients of the risk and to report symptoms

Embryofetal toxicity

  • Exposure to trastuzumab deruxtecan during pregnancy can cause embryofetal harm
  • Advise patients of these risks and the need for effective contraception

Contraindications

None

Cautions

Severe, life-threatening, or fatal interstitial lung disease (ILD), including pneumonitis, can occur

Severe neutropenia, including febrile neutropenia, can occur

Febrile neutropenia was reported; monitor complete blood cell counts before initiation and before each dose, and as clinically indicated

Left ventricular ejection fraction (LVEF) decrease has been observed; may be at increased risk of developing left ventricular dysfunction

May cause fetal harm when administered to a pregnant female

Interstitial lung disease

  • Promptly investigate evidence of ILD; Evaluate patients with suspected ILD by radiographic imaging. Consider consultation with a pulmonologist. For asymptomatic (Grade 1) ILD, consider corticosteroid treatment (e.g., =0.5 mg/kg/day prednisolone or equivalent)
  • Withhold therapy until recovery; in cases of symptomatic ILD (Grade 2 or greater), promptly initiate systemic corticosteroid treatment (eg, =1 mg/kg/day prednisolone or equivalent) and continue for at least 14 days followed by gradual taper for at least 4 weeks; permanently discontinue therapy in patients who are diagnosed with symptomatic (Grade 2 or greater) ILD

Drug interaction overview

  • Trastuzumab deruxtecan is a substrate of OATP1B1, OATP1B3, MATE2-K, P-gp, CYP3A4, MRP1 and BCRP; in vitro studies did not show evidence of meaningful clinical impact
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Pregnancy & Lactation

Pregnancy

Based on its mechanism of action, fetal harm may occur when administered to pregnant women

No data are available on use in pregnant women

Monitor women who received trastuzumab deruxtecan during pregnancy or within 7 months prior to conception for oligohydramnios; if oligohydramnios occurs, perform fetal testing that is appropriate for gestational age and consistent with community standards of care

Advise patients of potential fetal risks

Animal data

  • In postmarketing reports, use of a HER2-directed antibody during pregnancy resulted in cases of oligohydramnios manifesting as fatal pulmonary hypoplasia, skeletal abnormalities, and neonatal death
  • Based on its mechanism of action, the topoisomerase inhibitor component, can also cause embryofetal harm when administered to a pregnant woman because it is genotoxic and targets actively dividing cells

Clinical considerations

  • Monitor women who received treatment during pregnancy or within 7 months prior to conception for oligohydramnios
  • If oligohydramnios occurs, perform fetal testing that is appropriate for gestational age and consistent with community standards of care

Contraception

  • Females of reproductive potential: Use effective contraception during treatment and for at least 7 months following the last dose
  • Males with female partners of reproductive potential: Use effective contraception during treatment and for at least 4 months following the last dose

Infertility

  • Based on findings in animal toxicity studies, may impair male reproductive function and fertility

Lactation

There is no data regarding the presence of fam-trastuzumab deruxtecan-nxki in human milk, the effects on the breastfed child, or the effects on milk production

Advise women not to breastfeed during treatment and for 7 months after the last dose

Pregnancy Categories

A: Generally acceptable. Controlled studies in pregnant women show no evidence of fetal risk.

B: May be acceptable. Either animal studies show no risk but human studies not available or animal studies showed minor risks and human studies done and showed no risk.

C: Use with caution if benefits outweigh risks. Animal studies show risk and human studies not available or neither animal nor human studies done.

D: Use in LIFE-THREATENING emergencies when no safer drug available. Positive evidence of human fetal risk.

X: Do not use in pregnancy. Risks involved outweigh potential benefits. Safer alternatives exist.

NA: Information not available.

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Pharmacology

Mechanism of Action

HER2-targeted antibody-drug conjugate (ADC) which contains the humanized anti-HER2 IgG1, trastuzumab, covalently linked to the topoisomerase I inhibitor, deruxtecan

HER2 is a tyrosine kinase receptor growth-promoting protein found on the surface of some cancer cells that is associated with aggressive disease and poorer prognosis in breast cancer patients; anti-HER2 antibodies inhibit growth in tumor cells that overexpress HER2

Topoisomerase I inhibitors bind to topoisomerase I-DNA complex and prevents ligation of the cleaved DNA strand; this results in double-strand DNA breaks, and ultimately, cell death and termination of cellular replication

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Administration

IV Incompatibilities

0.9% NaCl

IV Compatibilities

Dextrose 5%

IV Preparation

Caution: In order to prevent medication errors, check vial labels to ensure drug being prepared and administered is fam-trastuzumab deruxtecan-nxki and not trastuzumab or ado-trastuzumab emtansine

Reconstitution

  • Reconstitute immediately before dilution; more than 1 vial may be needed for full dose
  • Slowly inject 5 mL of sterile water for injection to reconstitute each 100-mg vial to obtain final concentration of 20 mg/mL
  • Swirl vial gently until completely dissolved; do not shake
  • Visually inspect parenteral drug products for particulate matter and discoloration prior to administration, whenever solution and container permit; solution should be clear and colorless to light yellow
  • Do not use if visible particles are observed or if the solution is cloudy or discolored

Dilution

  • Dilute calculated volume of reconstituted solution in 100 mL D%W IV infusion bag
  • Compatible with polyvinylchloride or polyolefin (copolymer of ethylene and polypropylene) infusion bag
  • Gently invert infusion bag to thoroughly mix the solution; do not shake
  • Cover infusion bag to protect from light

IV Administration

Do not substitute for or with trastuzumab or ado-trastuzumab emtansine

If prepared infusion solution was refrigerated, allow solution to reach room temperature prior to administration

Administer as an IV infusion only with an infusion set made of polyolefin or polybutadiene and a 0.20 or 0.22 micron in-line polyethersulfone (PES) or polysulfone (PS) filter

Do not administer as an IV push or bolus

Do not mix with other drugs or administer other drugs through the same IV line

  • Infusion time

    • First infusion: Infuse over 90 min
    • Subsequent infusions: Infuse over 30 min if prior infusions were well tolerated
    • Slow or interrupt infusion rate if infusion-related symptoms develop
    • Permanently discontinue in case of severe infusion reactions
  • Missed dose

    • If a planned dose is delayed or missed, administer as soon as possible; do not wait until the next planned cycle
    • Adjust treatment schedule to maintain a 3-week interval between doses
    • Administer infusion at dose and rate tolerated in most recent infusion

Storage

Do not freeze

Protect from light

Do not shake the reconstituted or diluted solution

Unopened vials: Refrigerate at 2-8ºC (36-46ºF) in the original carton

Diluted vials: If not used immediately, refrigerate at 2-8ºC (36-46ºF) for up to 24 hr from the time of reconstitution; product does not contain a preservative

Diluted solutions: If not used immediately, store at room temperature for up to 4 hr including preparation and infusion, or refrigerate 2-8ºC (36-46ºF) for up to 24 hr

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Images

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Patient Handout

A Patient Handout is not currently available for this monograph.
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Formulary

FormularyPatient Discounts

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The above information is provided for general informational and educational purposes only. Individual plans may vary and formulary information changes. Contact the applicable plan provider for the most current information.

Tier Description
1 This drug is available at the lowest co-pay. Most commonly, these are generic drugs.
2 This drug is available at a middle level co-pay. Most commonly, these are "preferred" (on formulary) brand drugs.
3 This drug is available at a higher level co-pay. Most commonly, these are "non-preferred" brand drugs.
4 This drug is available at a higher level co-pay. Most commonly, these are "non-preferred" brand drugs or specialty prescription products.
5 This drug is available at a higher level co-pay. Most commonly, these are "non-preferred" brand drugs or specialty prescription products.
6 This drug is available at a higher level co-pay. Most commonly, these are "non-preferred" brand drugs or specialty prescription products.
NC NOT COVERED – Drugs that are not covered by the plan.
Code Definition
PA Prior Authorization
Drugs that require prior authorization. This restriction requires that specific clinical criteria be met prior to the approval of the prescription.
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Drugs that have quantity limits associated with each prescription. This restriction typically limits the quantity of the drug that will be covered.
ST Step Therapy
Drugs that have step therapy associated with each prescription. This restriction typically requires that certain criteria be met prior to approval for the prescription.
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Drugs that have restrictions other than prior authorization, quantity limits, and step therapy associated with each prescription.
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Medscape prescription drug monographs are based on FDA-approved labeling information, unless otherwise noted, combined with additional data derived from primary medical literature.