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EPA halts cancer-induced weight loss
The progressive weight loss and muscle
wasting seen in cancer patients could
be halted or even reversed by giving
them a high energy, high protein
supplement containing eicosapentae-noic
acid (EPA), according to the
results of an 8-week prospective
multicentre study.
Cachexia occurs in
the majority of patients with cancer
and can contribute sub-stantially
to morbidity and
mortality, seriously affects
quality of life, and causes
distress to patients and
their families.
Cancer-induced
weight loss is
mediated in part by a
glycoprotein called proteolysis-
inducing factor
PIF).
Research by
Professor Michael Tisdale
(Pharmaceutical Sciences
Research Institute, Aston
University, Birmingham, UK) showed
that EPA attenuates the catabolic
action of PIF on skeletal muscle.
Results of the study were presented
at a meeting of the British Association
of Parenteral and Enteral Nutrition
(13–15 November 2001, Harrogate,
UK).
Two hundred severely cachetic
patients with advanced pancreatic
cancer were asked to consume 1.5–2
cans of oral supplement per day; these
contained either 1.09 g EPA and 0.46 g
docosahexaenoic acid, together with
32 g protein, 49.7 g carbohydrate and
6.5 g fat (310 kcal), or an isocaloric,
isonitrogenous control mixture.
Prior to the study, weight loss in
both groups was 3.3 kg per month.
Four weeks later, the weights of
patients in both groups had stabilised,
and this effect was still seen at 8 weeks.
However, patients in the EPA group
showed a correlation between suppl-ement
intake and gain in both weight
(P<0.001) and lean body mass
(P=0.036); in fact, higher plasma EPA
concentrations were associated with
an increase in lean body mass.
Patients
were followed up for 6 months, but
there was no improvement in overall
survival. "We are looking at an
improvement in quality of life, but not
quantity of life”, says lead researcher
Kenneth Fearon, Professor of Surgical
Oncology at the University of
Edinburgh, UK.
"One of the key
questions now is whether this is a
useful adjuvant to chemotherapy, since
a patient’s physical decline will
sometimes limit the amount of
chemotherapy they can take. That’s
what we are working on at the
moment", he adds.
THE LANCET Oncology Vol 3 January 2002 7
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