FDA Approves Genentech’s Itovebi Breast Cancer Drug

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FDA has approved Genentech’s Itovebi (inavolisib) with palbociclib (Pfizer’s Ibrance) and fulvestrant (Faslodex) for adults with endocrine-resistant, PIK3CA-mutated, HR-positive, HER2-negative, locally advanced or metastatic breast cancer as detected by an FDA-approved test, following recurrence on or after completing adjuvant endocrine therapy. An agency notice says FDA also approved the FoundationOne Liquid CDx assay as a companion diagnostic device to identify patients with breast cancer for treatment with Itovebi with Ibrance and Faslodex.

The notice says efficacy was evaluated in the INAVO 120 trial involving 325 patients. The major outcome efficacy measure was investigator-assessed progression-free survival, it says, with additional outcome measures including overall survival, investigator-assessed objective response rate, and duration of response.

The most common adverse reactions were decreased neutrophils, decreased hemoglobin, increased fasting glucose, decreased platelets, decreased lymphocytes, stomatitis, diarrhea, decreased calcium, fatigue, decreased potassium, increased creatinine, increased ALT (alanine aminotransferase), nausea, decreased sodium, decreased magnesium, rash, decreased appetite, Covid-19 infection, and headache, FDA says.

The review was conducted under the FDA Oncology Center of Excellence’s Project Orbis, in which FDA collaborated with the Australian Therapeutic Goods Administration, Health Canada, and Switzerland’s Swissmedic. The review used the Assessment Aid and was granted priority review and breakthrough designation.

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