The research, led by German scientists, included nearly 800 older people (average age 73) who had been diagnosed with chronic lymphocytic leukemia. CLL is a cancer of the blood and bone marrow, the tissue inside bones in which blood cells are created.
The study was published online Jan. 8 in the New England Journal of Medicine. Study participants -- none of whom had received treatment for their illness before the start of the research -- were randomly assigned to one of three groups.
One group received an oral medication called chlorambucil (also known by the brand name Leukeran), the standard chemotherapy drug for older patients with CLL.
The second group received chlorambucil plus a drug called rituximab (Rituxan). This drug has been used effectively in combination with other forms of chemotherapy for more than a decade to treat younger, fitter patients with CLL, an expert said.
The third group received chlorambucil plus a new antibody drug called obinutuzumab. The rituximab and obinutuzumab were given intravenously.
The researchers, whose study was funded by the manufacturer of both obinutuzumab and rituximab, reported that the obinutuzumab-chlorambucil combination improved outcomes for the older CLL patients better than the other two treatment options.
The most common side effects for obinutuzumab are infusion reactions, low blood cell counts, fever, cough and musculoskeletal disorders, according to the manufacturer's website.
Dr. William Wierda, a professor in the department of leukemia at the University of Texas MD Anderson Cancer Center, said older patients don't tend to tolerate intensive chemotherapy with rituximab as well as younger patients. That has left older CLL patients with limited drug options, including chlorambucil, he said.
"We've been wanting to find a treatment that is effective and well tolerated in the elderly population," said Wierda, who was not involved with the new research. "A standard treatment for older patients with CLL has been chlorambucil, a type of chemotherapy that's been used for many years."
"The trial shows improvement in outcome remission rates and duration favoring patients who got chlorambucil and obinutuzumab," he said. "This was a head-to-head comparison of the two antibody arms of the study -- the rituximab and the obinutuzumab -- and obinutuzumab won out."
There also was an improvement in overall survival among the patients who received the obinutuzumab-chlorambucil combination treatment versus those who received chlorambucil alone, Wierda said.
New Drug Combo Might Help Older, Sicker Patients With Leukemia - Drugs.com MedNews
