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Promising breast cancer drug hits roadblock

SAN ANTONIO (AP) - One of the most promising new approaches for fighting breast cancer took a stunning setback Thursday when a
major study showed that a bone-building drug did not stop cancer
from returning or extend life for most women fighting the disease.

However, the drug Zometa did seem to help certain
post-menopausal women. Its maker, Novartis AG, is considering
further study, but will suspend plans to expand it beyond its
current use as a treatment for patients whose cancer has spread to
the bone.

"Ten years of work and to have essentially a negative study is
disappointing, particularly on a tremendous wave of enthusiasm for
this based on some positive trials in the past," said the study's
leader, Dr. Robert Coleman of the University of Sheffield in
England. He presented results at a cancer conference in San
Antonio.

Bone drugs called bisphosphonates, sold as Fosamax, Boniva and Actonel, have long been sold for treating osteoporosis. Those are
daily pills; Zometa, sold as Reclast for osteoporosis, is given as
an infusion twice a year.

Hopes that these drugs could also prevent cancer soared after a
study two years ago found Zometa cut the risk of cancer recurrence
by 30 percent in younger women forced into early menopause by
hormone treatments they received.

The excitement grew last year, when a large study found that
women who were not cancer patients and were taking daily
bisphosphonate pills to prevent bone problems were about one-third
less likely to develop breast cancer.

The new study was meant to be definitive. It tested Zometa in
3,360 women of all ages in seven countries who had breast cancer
that had spread to lymph nodes. All received standard cancer
treatments, and half also got periodic infusions of Zometa for five
years.

After five years of followup, about 400 women in each group had
died or suffered a recurrence.

However, among the roughly 1,100 women who were at least five
years past menopause when the study began, Zometa cut the risk of
recurrence by about 27 percent and improved survival odds by about
29 percent.

"We don't believe that's just a chance finding," Coleman said.
It fits with the benefit seen in the earlier study of younger
women. It may be that Zometa works best when no or little estrogen
is present, he said.

Side effects are a concern: 26 women on Zometa - 1 to 2 percent
of the group - developed confirmed or suspected cases of jawbone
decay, a serious problem long linked to bisphosphonates. Blood
clots in the lung also were more common among those on Zometa,
although not significantly so, Coleman said.

"That makes the case that these drugs should not be given
without a clear indication of their value. They're not totally
innocuous," he said.

The study was sponsored by Switzerland-based Novartis, and
Coleman consults for the company. Zometa costs more than $1,000 per infusion.

Herve Hoppenot, president of Novartis Oncology, said the company
would withdraw applications in the U.S., Europe and elsewhere to
expand Zometa's use to premenopausal breast cancer patients like
those in the earliler successful study.

"We need to decide what to do from here," he said. The new
study's result "was a surprise, I would say."

Zometa's role in cancer prevention remains uncertain, said Dr.
Peter Ravdin of the University of Texas Health Science Center at
San Antonio, one of the organizers of the cancer conference.

"There are some indications that in some patients it may still
have value," but the side effect profile "certainly means that
this drug shouldn't be given without confidence that it will cause
benefit," he said.

Studies testing other bisphosphonate drugs for breast cancer
will have results in a year or two.

Breast cancer is the most common major cancer in women. About
207,000 new cases and nearly 40,000 deaths from it are expected in
the United States this year.

The cancer conference is sponsored by the American Association
for Cancer Research, Baylor College of Medicine and the UT Health
Science Center.
---
Online:
Cancer conference: http://www.sabcs.org
Study details: http://tinyurl.com/3yzqekj
American Cancer Society: www.cancer.org

(Copyright 2010 by The Associated Press. All Rights Reserved.)


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