Novartis Scemblix gets USFDA nod for chronic myeloid leukemia

"The introduction of TKIs twenty years ago revolutionized treatment for CML; however, there remain many patients who do not respond adequately to at least two available treatments and often experience challenging side effects that add a burden to their daily lives," said Lee Greenberger, Chief Scientific Officer at The Leukemia & Lymphoma Society. "The approval of Scemblix may offer hope to patients by addressing gaps in CML care."

For many patients, current treatment for CML may be limited by intolerance or resistance, and sequential use of available TKIs is associated with increased failure rates. In an analysis of patients with CML treated with two prior TKIs, approximately 55% reported intolerance to previous treatment. Additionally, a pooled analysis in the second-line setting showed that up to 70% of patients are unable to achieve major molecular response (MMR) within two years of follow-up. Moreover, patients who develop the T315I mutation are resistant to most available TKIs, leaving them at an increased risk of disease progressio.

"CML can be difficult to treat when currently available treatments fail patients, when treatment side effects cannot be tolerated, or sometimes both," expressed Dr. Michael J. Mauro**, Hematologist and Myeloproliferative Neoplasms Program Leader at Memorial Sloan Kettering Cancer Center (MSK). "The addition of Scemblix into the CML treatment landscape gives us a novel approach to combat this blood cancer, helping address clinical challenges in patients struggling after switching to a second treatment, as well as in patients who develop the T315I mutation and face significantly worse outcomes."

The FDA approval of Scemblix is based on results from the Phase III ASCEMBL trial and a Phase I (NCT02081378) study that included patients with Ph+ CML-CP with the T315I mutation.

In patients with Ph+ CML-CP who had experienced resistance or intolerance to at least two TKIs, the ASCEMBL trial showed that:

• Scemblix nearly doubled the MMR rate vs. Bosulif (bosutinib)* at 24 weeks (25% vs. 13% [P=0.029])
• The proportion of patients who discontinued treatment due to adverse reactions was more than three times lower in the Scemblix arm (n = 156) vs. patients in the Bosulif arm (n = 76) (7% vs. 25%)

"After more than two decades of reimagining CML care, we continue to boldly push the boundaries of innovation to transform the standard-of-care and help even more patients living with this disease," said Susanne Schaffert, PhD, President, Novartis Oncology. "We would like to thank all those who have been involved in helping to advance this new and important breakthrough."

Scemblix is currently available for physicians to prescribe to appropriate patients in the US.