New hope for patients with hard-to-treat head and neck
Treatment could shrink tumors before surgery and reduce
chemotherapy’s damaging side effects; clinical trial to launch later this year
Using a technique that looks for genes that tumor cells need to survive, Fred
Hutchinson Cancer Research Center scientists have identified a potential new drug for a class of difficult-to-treat
head and neck cancers.
The gene they identified as essential for these tumor cells to survive happens to
be the target of an existing cancer drug, and an early-phase clinical trial will soon launch to help determine
whether the drug can shrink tumors faster for patients with head and neck cancer.
Head and neck cancer, the
sixth most common type of cancer in the world, arises from cells that line the mouth, nose, throat, larynx and,
rarely, salivary glands. Tobacco use and infection with human papillomavirus (HPV) increase the risk of head and
These malignancies are often disfiguring, as the tumors can impede the ability to
talk, swallow or even breathe. Current treatments have major drawbacks – depending on the tumor’s location, surgery
to remove it can be as disfiguring as the tumor itself, and the chemotherapy drug commonly used to treat head and
neck cancer has numerous toxic side effects.
“Patients have to wear their disease for the public to see, or perceive, or hear,”
said Fred Hutch’s Dr. Eduardo Méndez, a head and neck cancer researcher who led the study. “So there’s a sense of
urgency and a sense of need, not just to eradicate the disease, but to do so in a way that the patient can thrive
and be functional.”
The study, published Aug. 14 in the journal Clinical Cancer Research, looked at
cells from a type of head and neck cancer that harbored mutations in the tumor-suppressor gene p53. Such mutations
are common in head and neck cancers, Méndez said, but render the cancer much harder to treat. Patients with these
mutations tend to fare even worse than those without the genetic defect .
“Cancer happens when cells either activate genes that press the gas too much on
replication or lose genes that help cells apply the brakes,” said Méndez, who also sees patients with head and neck
cancer at Seattle Cancer Care Alliance, Fred Hutch’s treatment arm.
The p53 gene normally acts as a brake against rapid cell growth. When tumor cells
lose a gene, it’s difficult to drug what isn’t there, Méndez said, so scientists have looked to other genes that
interact with p53 to find ways to target treatments to these specific cancers. Currently, no such targeted
treatment for p53-mutant head and neck cancer exists.
A new way to target cancers
Drs. Carla Grandori (left) and Christopher Kemp, pictured here with researcher Kay
Gurley (right), perfected a technique to sift through thousands of genes in cancer cells to find potential drug
To unearth new therapeutic possibilities for these cancers, Méndez teamed up with
Fred Hutch colleagues Drs. Christopher Kemp and Carla Grandori to use a technique they honed over the past few
years. Termed “functional genomics,” the technique screens through hundreds or thousands of genes to look for those
which, when shut off, halt the growth of tumor cells but not healthy cells.
The scientists are also using the technology in larger screens to look for more
drug targets in head and neck, breast and pancreatic cancer, thanks to a recent $4 million award from the National
Cancer Institute to Kemp, Grandori, Méndez and Fred Hutch breast cancer researcher Dr. V.K. Gadi.
The genes they find are considered tantalizing candidates for new drug discovery --
or existing drug discovery, in the case of Méndez and Kemp’s study. The screen yielded 38 potential drug targets
for p53-mutant head and neck cancers. One of those genes, Wee1, turned out to be a target of the cancer drug
AZD1775, which is owned by the pharmaceutical company AstraZeneca. Although not yet approved by the Food and Drug
Administration for cancer treatment, AZD1775 is being tested for various cancer types, including ovarian and
The researchers tested the drug in a mouse model of p53-mutant head and neck
cancer, and “the results were remarkable,” Méndez said. AZD1775 slowed tumor growth and, most important for its
potential value to patients, synergized with chemotherapy to shrink tumors even further. Méndez and colleagues hope
that AZD1775 could be used to sensitize head and neck cancer patients to cisplatin, a powerful but toxic
Regimens using cisplatin to shrink tumors before surgery are often too toxic for
patients, meaning some head and neck cancer patients are missing out on a way to improve their chances to remove
all traces of their tumor or lessen the impact of surgery. If the new drug works as the researchers project, it
would allow clinicians to dose head and neck cancer patients with very small amounts of cisplatin, reducing
chemotherapy’s damaging side effects while still shrinking tumors before surgery.
‘Research and patients are
Méndez’s team, in collaboration with Fred Hutch head and neck cancer oncologist Dr.
Laura Chow and SCCA’s head and neck medical oncology team, this fall will launch an early-phase clinical trial of
AZD1775 funded by AstraZeneca and the Fred Hutchinson/University of Washington Cancer Consortium. They plan to
enroll up to 20 patients with locally advanced head and neck cancers, with or without the p53 mutation, and they
will test whether the Wee1-targeting drug in combination with cisplatin can shrink patients’ tumors enough to
improve their chances of successful surgery to remove their tumors entirely.
As part of that study, with support from Fred Hutch’s Solid Tumor Translational
Research Program, the researchers also will use a mouse model of head and neck cancer personalized to each
participant’s tumor to better understand the molecular changes that underlie response or resistance to the novel
The researchers are the first to test AZD1775 prior to surgery for head and neck
cancer, and if the trial is successful, patients with head and neck cancer not currently eligible for surgery who
receive this treatment could have their tumors fully removed and still preserve their quality of
Partnering with Kemp and Grandori opened doors for his research, and its potential
impact to his patients, that never would have been possible working alone, Méndez said.
“That’s why patients come here,” he said. “We’re offering very new and innovative
therapies. Research and patients are intertwined.”
Aug. 13, 2014 - By Dr. Rachel Tompa / Fred Hutch News Service
SOURCE: The website of the
National Cancer Institute (http://www.cancer.gov)