Announcing a New Genentech Therapy

  • July 16, 2020

Genentech is excited to share the news of the Food and Drug Administration (FDA) approval of PHESGO (pertuzumab, trastuzumab, and hyaluronidase-zzxf) injection, for subcutaneous use. PHESGO is a fixed-dose combination of pertuzumab and trastuzumab, HER2/neu receptor antagonists, and hyaluronidase, an endoglycosidase.


Early Breast Cancer

PHESGO (pertuzumab, trastuzumab, and hyaluronidase-zzxf) is indicated for use in combination with chemotherapy for

  • the neoadjuvant treatment of adult patients with HER2-positive, locally advanced, inflammatory, or early stage breast cancer (either greater than 2 cm in diameter or node-positive) as part of a complete treatment regimen for early breast cancer (EBC)
  • the adjuvant treatment of adult patients with HER2-positive early breast cancer (EBC) at high risk of recurrence

Select patients for therapy based on an FDA-approved companion diagnostic test.

Metastatic Breast Cancer 

PHESGO is indicated for use in combination with docetaxel for the treatment of adult patients with HER2-positive metastatic breast cancer (MBC) who have not received prior anti-HER2 therapy or chemotherapy for metastatic disease.

Select patients for therapy based on an FDA-approved companion diagnostic test.

Important Safety Information

BOXED WARNINGS: Cardiomyopathy, Embryo-Fetal Toxicity, and Pulmonary Toxicity

  • PHESGO administration can result in subclinical and clinical cardiac failure. The incidence and severity was highest in patients receiving PHESGO with anthracycline-containing chemotherapy regimens. Evaluate cardiac function prior to and during treatment with PHESGO. Discontinue PHESGO treatment in patients receiving adjuvant therapy and withhold PHESGO in patients with metastatic disease for clinically significant decrease in left ventricular function
  • Exposure to PHESGO can result in embryo-fetal death and birth defects, including oligohydramnios and oligohydramnios sequence manifesting as pulmonary hypoplasia, skeletal abnormalities, and neonatal death. Advise patients of these risks and the need for effective contraception
  • PHESGO administration can result in serious and fatal pulmonary toxicity. Discontinue PHESGO for anaphylaxis, angioedema, interstitial pneumonitis, or acute respiratory distress syndrome. Monitor patients until symptoms completely resolve


PHESGO is contraindicated in patients with known hypersensitivity to pertuzumab, or trastuzumab, or hyaluronidase, or to any of its excipients.

Additional Important Safety Information

  • Exacerbation of Chemotherapy-Induced Neutropenia
  • Hypersensivity and Administration-Related Reactions (ARRs): Monitor patients for systemic hypersensitivity reactions. Permanently discontinue PHESGO in patients who experience anaphylaxis or severe hypersensitivity reactions.

Most Common Adverse Reactions

Early Breast Cancer

The most common adverse reactions (>30%) with PHESGO were alopecia, nausea, diarrhea, anemia, and asthenia

Metastatic Breast Cancer (Based on IV Pertuzumab)

The most common adverse reactions (>30%) with pertuzumab in combination with trastuzumab and docetaxel were diarrhea, alopecia, neutropenia, nausea, fatigue, rash, and peripheral neuropathy.

Please see full Prescribing Information for additional Important Safety Information, including BOXED WARNINGS.

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