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Data updated: Mar 10, 2026

HERCEPTIN HYLECTA

TRASTUZUMAB AND HYALURONIDASE-OYSK HER2/Neu/cerbB2 Antagonists
Oncology Approved 2019-02-28

HERCEPTIN HYLECTA is a combination of trastuzumab and hyaluronidase indicated for the treatment of adults with HER2-overexpressing breast cancer. It is used as adjuvant therapy for node-positive or high-risk node-negative disease, either as part of a multi-drug chemotherapy regimen or as a single agent following anthracycline-based therapy. The drug is also indicated for metastatic breast cancer, both as a first-line treatment in combination with paclitaxel and as a single agent for patients who have previously received chemotherapy. Patient selection for this therapy must be confirmed using an FDA-approved companion diagnostic for trastuzumab.

Source: FDA Label • Roche • Endoglycosidase

How HERCEPTIN HYLECTA Works

Trastuzumab is a HER2/neu receptor antagonist that binds to the HER2 protein to inhibit the proliferation of human tumor cells. It also functions as a mediator of antibody-dependent cellular cytotoxicity, which preferentially targets cancer cells that overexpress HER2. The hyaluronidase component acts as an endoglycosidase that temporarily depolymerizes hyaluronan in the subcutaneous tissue. This increases the permeability of the tissue, which enhances the absorption rate of trastuzumab into the systemic circulation.

Source: FDA Label
2
Indications
--
Phase 3 Trials
7
Years on Market

Details

Status
Prescription
First Approved
2019-02-28
Routes
SUBCUTANEOUS
Dosage Forms
INJECTABLE

Companies

HERCEPTIN HYLECTA Approval History

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What HERCEPTIN HYLECTA Treats

1 indications

HERCEPTIN HYLECTA is approved for 1 conditions since its original approval in 2019. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Breast Cancer
Source: FDA Label

HERCEPTIN HYLECTA Boxed Warning

CARDIOMYOPATHY, EMBRYO-FETAL TOXICITY, and PULMONARY TOXICITY WARNING: CARDIOMYOPATHY, EMBRYO-FETAL TOXICITY, and PULMONARY TOXICITY See full prescribing information for complete boxed warning. Cardiomyopathy: HERCEPTIN HYLECTA can result in subclinical and clinical cardiac failure manifesting as CHF, and decreased LVEF, with greatest risk when administered concurrently with anthracyclines. Evaluate cardiac function prior to and during treatment. Discontinue HERCEPTIN HYLECTA for cardiomyopathy....

HERCEPTIN HYLECTA Target & Pathway

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Target

HER2 (Human Epidermal Growth Factor Receptor 2) Growth Factor Receptor

A receptor tyrosine kinase that promotes cell growth and division. Approximately 20% of breast cancers overexpress HER2, leading to aggressive tumor growth. Targeting HER2 blocks these growth signals and can trigger immune-mediated destruction of cancer cells.

Pathway Context

HER2 forms dimers with other HER family members to activate growth signaling

EGFR (Epidermal Growth Factor Receptor) receptor

A receptor that triggers cell growth, proliferation, and survival when activated. Mutations or overexpression of EGFR drive many cancers, particularly lung cancer. Blocking EGFR stops the growth signals that fuel tumor progression.

HERCEPTIN HYLECTA Competitors

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10 other drugs also target HER2. Compare mechanisms, indications, and trial activity.

View all 10 HER2 drugs →
Drug = Competitor name Company = Manufacturer N indic. = FDA-approved indications → Date = Patent/exclusivity expiry

Competitors share the same molecular target (HER2). Earlier expiry dates signal biosimilar/generic opportunities.

Drugs Similar to HERCEPTIN HYLECTA

FDA-approved drugs for similar conditions. Compare mechanisms and indications to understand treatment alternatives.

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Active Pipeline

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Ongoing clinical trials by development phase

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Key Completed Trials

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Completed studies with published results, ranked by significance

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

HERCEPTIN HYLECTA FDA Label Details

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Indications & Usage

FDA Label (PDF)

HERCEPTIN HYLECTA is a combination of trastuzumab, a HER2/neu receptor antagonist, and hyaluronidase, an endoglycosidase, indicated in adults for: The treatment of HER2-overexpressing breast cancer. Select patients for therapy based on an FDA-approved companion diagnostic for trastuzumab. 1.1 Adjuvant Breast Cancer HERCEPTIN HYLECTA is indicated for adjuvant treatment of adults with HER2 overexpressing node positive or node negative (ER/PR negative or with one high risk feature [see Clinical Studies ] ) breast cancer: as part of a treatment regimen consisting of doxorubicin, cyclophosphamide, ...

⚠️ BOXED WARNING

WARNING: CARDIOMYOPATHY, EMBRYO-FETAL TOXICITY, and PULMONARY TOXICITY WARNING: CARDIOMYOPATHY, EMBRYO-FETAL TOXICITY, and PULMONARY TOXICITY See full prescribing information for complete boxed warning. Cardiomyopathy: HERCEPTIN HYLECTA can result in subclinical and clinical cardiac failure manifest...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.