New blood cancer therapy treats seven in 10 patients

An experimental therapy could offer blood cancer patients a ‘new lease on life’, scientists say.

The immunotherapy treatment — called talquetamab — successfully treated 73 percent of patients with multiple myeloma in a global trial.

It helped people who had relapsed in their disease more than once after other treatments failed to bring them into remission for an extended period of time. 

Dr Ajai Chari from the Multiple Myeloma Program at The Tisch Cancer Institute and lead author of both studies said: ‘This means that almost three-quarters of these patients are looking at a new lease on life.’

The drug works by teaching the body’s white blood cells to kill tumor cells that form in a type of white blood cell called a plasma cell.

Multiple myeloma is a deadly cancer which kills around half of sufferers within five years of a diagnosis.

Talquetamab, administered intravenously, helped reduced cancer or clear it entirely in about 73 per cent of patients who took part in the trials

The new drug specifically targets the protein GPRC5D. Too much of it in the bone marrow is associated with poor survival in patients with multiple myeloma.

Talquetamab binds to GPRC5D which rallies T cells – white blood cells that develop from stem cells in the bone marrow – to fight the cancerous cells.

It was tested in two separate trials, the first of which was published in September.

The Phase 2 results were presented Saturday at the American Society of Hematology annual meeting.

The reflected data from nearly 300 cancer patients who had tried at least three different therapies without achieving lasting remission.

While 143 patients were treated with a 405 μg per kilogram dose weekly and 145 patients treated with a higher 800 μg per kilogram dose every other week.

Scientists recorded improvements in symptoms after about a month. People began responding to the treatments at different doses within about nine months. 

More than 30 percent of patients in both groups had a complete response, meaning all signs of cancer have disappeared.

The rest of successful treatment patients had a very good partial response or better, meaning the cancer was substantially reduced but not necessarily down to zero.

Talquetamab also worked at least as well or better than other standard treatments for multiple myeloma.

Sixty-five percent of those who received talquetamab at the 405-μg dose level and 70 percent of those who received it at the 800-μg dose level had an immune response.

Meanwhile, only 25 percent of similar patients who received selinexor plus dexamethasone, and 31 percent of those who received belantamab mafodotin.

Both of those drugs are Food and Drug Administration-approved.