On September 17, 2024, Novartis announced that its CDK4/6 inhibitor Kisqali (Libocik) has been approved by the U.S. Food and Drug Administration (FDA) for early stage breast cancer (EBC) as adjunctive therapy for patients with HPRT+/HER2- early stage breast cancer. This approval will almost double the likelihood that eligible patients will be able to use Kisqali when receiving adjuvant therapy.
The approval is based on results from the pivotal Phase III NATALEE trial, which showed a significant reduction in the risk of disease recurrence in a broad range of HR+/ HER2-stage II and III EBC patients, including those with high-risk N0 disease (3-6), receiving adjuvant Kisqali plus endocrine therapy (ET). The benefit of invasive disease-free survival (iDFS) compared to receiving endocrine therapy (ET) alone was consistently observed in all patient subgroups 3-6.
"The FDA's approval of Kisqali for people with early breast cancer, including those without the disease, is a critical moment in improving our approach to care." Dennis J. Slamon, M.D., director of clinical/Translational research at UCLA Jonsson Comprehensive Cancer Center, chair of the Council on Translational Cancer Research (TRIO) and principal investigator of the NATALEE trial. "Today's approval allows us to offer CDK4/6 inhibitor therapy to a broader population as a powerful tool that, in combination with endocrine therapy, can help further reduce the risk of cancer recurrence."
In EBC, Kisqali is taken orally once a day at a dose of 400 mg (two 200 mg tablets) for three weeks with or without food, followed by a week of discontinuation of treatment and four weeks in combination with any AI1. Patients should take Kisigali for three years. The NATALEE trial showed that Kisqali's 400mg dose was well tolerated, with discontinuation mainly due to asymptomatic laboratory results3. Adverse events (aes) of particular concern in the Kisqali + ET group in the NATALEE trial included (all grades and grades 3/4): neutropenia (62.5%, 44.3%), liver-related aes (26.4%, 8.6%), QT interval prolongation (5.3%, 1.0%) and interstitial lung disease/pneumonia (1.5%, 0.0%)4.
The latest analysis of the NATALEE trial, recently presented at the European Society of Medical Oncology (ESMO) 2024 Congress, strengthens the data analyzed by the FDA. The results showed that after three years of treatment, the benefit was deepened and the risk of recurrence was reduced by 28.5% (HR=0.715; Ci 95% 0.609-0.840; P<0.0001), compared to ET alone, in stage II and III HR+/ HER2-EBC7 patients. Novartis will continue to evaluate the long-term prognosis of patients with NATALEE, including overall survival.
In the United States, approximately 90% of breast cancer cases are diagnosed early (stage I-III) and treated promptly with the aim of a cure - sometimes with adjuvant therapy. Despite this, stage II and III HR+/ HER2-EBC patients are still at risk of their cancer coming back - in most cases, as incurable metastatic disease, 8,9. Although most tumors recur in the first few years, even in cases where no lymph nodes are involved, recurrence remains a lifelong problem. Despite ET, 10% of patients with high-risk N0 disease may face relapse within the first three years after diagnosis.
Victor Bulto, president of Novartis USA, said: "With this approval, we are redefining treatment options for a broader population affected by breast cancer and at risk of ongoing recurrence. "We continue to transform cancer treatment with Kisqali, building on its established profile in metastatic Settings and now helping a wide range of people as they struggle to remain cancer-free after an early diagnosis."
In the pivotal Phase II NATALEE clinical trial, Kisqali showed a significant 25% reduction in the risk of recurrence compared to patients who received endocrine therapy (ET) alone. The trial results showed consistent efficacy across all patient subgroups and had a good safety profile, including in node-negative patients.
At the recently concluded European Society of Medical Oncology (ESMO) meeting, the latest data from the NATALEE trial were presented, showing a deeper benefit in invasive disease-free survival (iDFS) across subgroups of patients at the end of the three-year treatment period.
In addition, for patients with stage II and III HR+/HER2- early stage breast cancer, they often face a significant risk of recurrence and may even develop incurable metastatic disease, despite receiving adjuvant endocrine therapy (ET) and regardless of lymph node involvement.
Kisqali has already been approved for HR+/HER2- metastatic breast cancer as early as 2020 and is currently under regulatory review for an early breast cancer indication worldwide, including in the European Union.