FDA OKs Subcutaneous Atezolizumab for Multiple Cancers

The US Food and Drug Administration (FDA) has approved atezolizumab and hyaluronidase-tqjs (Tecentriq Hybreza, Genentech, Inc.) as a subcutaneous injection in adults, covering all approved indications of the intravenous (IV) formulation.

Approved indications include non–small-cell lung cancer (NSCLC), small-cell lung cancer, hepatocellular carcinoma, melanoma, and alveolar soft part sarcoma. Specific indications are available with the full prescribing information at Drugs@FDA.

This is the first programmed death–ligand 1 inhibitor to gain approval for subcutaneous administration.

“This approval represents a significant option to improve the patient experience,” Ann Fish-Steagall, RN, Senior Vice-president of Patient Services at the LUNGevity Foundation stated in a Genentech press release.

Subcutaneous atezolizumab and hyaluronidase-tqjs was evaluated in in the open-label, randomized IMscin001 trial of 371 adult patients with locally advanced or metastatic NSCLC who were not previously exposed to cancer immunotherapy and who had disease progression following treatment with platinum-based chemotherapy. Patients were randomized 2:1 to receive subcutaneous or IV administration until disease progression or unacceptable toxicity.

Atezolizumab exposure, the primary outcome measure of the study, met the lower limit of geometric mean ratio above the prespecified threshold of 0.8 (cycle 1C trough, 1.05; area under the curve for days 0-21, 0.87).

No notable differences were observed in overall response rate, progression-free survival, or overall survival between the two formulations, according the FDA approval notice.

The confirmed overall response rate was 9% in the subcutaneous arm and 8% intravenous arm.

Adverse events of any grade occurring in at least 10% of patients were fatigue, musculoskeletal pain, cough, dyspnea, and decreased appetite.

The recommended dose for subcutaneous injection is one 15 ml injection, which contains 1875 mg of atezolizumab and 30,000 units of hyaluronidase.

Injections should be administered in the thigh over approximately 7 minutes every 3 weeks. By contrast, IV administration generally takes 30-60 minutes.

Sharon Worcester, MA, is an award-winning medical journalist based in Birmingham, Alabama, writing for Medscape Medical News, MDedge, and other affiliate sites. She currently covers oncology, but she has also written on a variety of other medical specialties and healthcare topics. She can be reached at sworcester@mdedge.com or on X @SW_MedReporter.