AstraZeneca’s Calquence (acalabrutinib), a next-generation, selective Bruton’s tyrosine kinase (BTK) inhibitor, has been approved in Japan for the treatment of adult patients with relapsed or refractory chronic lymphocytic leukaemia (CLL) (including small lymphocytic lymphoma [SLL]).
The approval by the Japanese Ministry of Health, Labour and Welfare (MHLW) was based on positive results from the ASCEND phase III trial and a phase I trial in Japanese patients, showing Calquence monotherapy demonstrated a statistically significant and clinically meaningful improvement in progression-free survival (PFS) versus a standard treatment of rituximab, a monoclonal antibody, combined with the physician’s choice of idelalisib, a PI3-kinase inhibitor or bendamustine, a chemotherapy.
CLL is the most common type of adult leukaemia across the globe but is considered a rare disease in Japan and East Asia, representing between 1% and 2% of patients diagnosed with leukaemia.
Dai Maruyama, MD, PhD, director, Department of Hematology and Oncology, Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan said, “This news marks great progress for patients with chronic lymphocytic leukaemia in Japan. As the ASCEND trial showed, Calquence provides a significant improvement in progression-free survival compared with current standard therapies. Treatment with a safe and tolerable regimen remains paramount for these patients who often require ongoing therapy for many years.”
Dave Fredrickson, executive vice president, Oncology Business Unit, said, “Chronic lymphocytic leukaemia is less prevalent in Japan than other regions, yet patients remain in need of innovative treatment options. This approval of Calquence offers patients in Japan a new, chemo-free, tolerable treatment option with uncompromised efficacy and the potential to positively impact quality of life.”
In the ASCEND phase III trial, an estimated 88% of patients with relapsed or refractory CLL treated with Calquence remained alive and free from disease progression after 12 months compared with 68% of patients on rituximab combined with idelalisib or bendamustine. After a median follow up of 16.1 months, median PFS was not reached with Calquence monotherapy versus 16.5 months in the control arm.
Calquence is approved for the treatment of CLL and SLL in the US and is approved for the treatment of CLL in the EU and in several other countries worldwide in the 1st-line and relapsed or refractory settings. Calquence is also approved in the US and several other countries for the treatment of adult patients with mantle cell lymphoma (MCL) who have received at least one prior therapy. Calquence is not currently approved for the treatment of MCL in Japan or the EU.
CLL is the most common type of leukaemia in adults, with an estimated 114,000 new cases globally in 2017, and the number of people living with CLL is expected to grow with improved treatment as patients live longer with the disease. In CLL, too many blood stem cells in the bone marrow become abnormal lymphocytes and these abnormal cells have difficulty fighting infections. As the number of abnormal cells grows there is less room for healthy white blood cells, red blood cells, and platelets. This could result in anaemia, infection, and bleeding. B-cell receptor signalling through BTK is one of the essential growth pathways for CLL.
ASCEND (ACE-CL-309) was a global, randomised, multicentre, open-label phase III trial evaluating the efficacy of Calquence in patients with relapsed or refractory CLL. In the trial, 310 patients were randomised (1:1) into two arms. Patients in the first arm received Calquence monotherapy (100mg twice daily until disease progression or unacceptable toxicity). Patients in the second arm received physician’s choice of either rituximab, a CD20 monoclonal antibody, in combination with idelalisib, a PI3-kinase inhibitor, or rituximab in combination with bendamustine, a chemotherapy.
