Our discussions about Tamoxifen and other hormonal treatments for breast cancer are among our most commented upon.
In medical circles, Tamoxifen is described as
‘well tolerated’, particularly in comparison to harsher treatments like chemotherapy
and radiotherapy. Very
often, once our active breast cancer treatment finishes, we are then sent off
into our futures with a packet of pills. The message we are given is that we
are now “well” and we can carry on with our lives. Our experiences point to a
very different reality.
There is substantial evidence to support the effectiveness of
Tamoxifen and aromatase inhibitors (Letrozole, Anastrozole, Exemestane) in
preventing a recurrence of breast cancer. These drugs work by eliminating
estrogen from the body, thus providing protection against estrogen fed cancers.
It’s important to bear in mind that there are many different types of breast
cancer, and each of us will have her own individual treatment regime. For those
cancers that are not estrogen receptive, such as triple negative breast cancer,
there is no equivalent ongoing drug, which can leave those not taking
medication feeling unprotected and vulnerable.
We are struck by the struggles that some women experience on
adjuvant hormonal therapy, with some of us suffering significant adverse side
effects. What baffles us is not only the lack of support and information
available for women prescribed these treatments but, for many, the lack of
recognition given to the cumulative impact of these effects on our quality of
life. Since many of us are now given hormonal treatments for 5, maybe even 10
years; that, we agreed, is a long time to be taking tablets that make us feel so
unwell.
For those of us who tolerate these drugs well,
there is a significant comfort factor in knowing we are doing all we can to
prevent the recurrence of cancer, although it needs to be remembered that
taking these tablets can be a daily reminder of breast cancer. For those
of us who suffer side effects that compromise their quality of life, this can
present a huge challenge. The list of side effects is varied and long and may
include: menopausal symptoms such as hot flushes and bone, joint or muscle
pain, mood swings, fatigue, weight gain, vaginal dryness and impaired cognitive
function to name but a few. Many women reported feeling below par all the time,
and unable to fully enjoy life as a result. As a lack of estrogen may affect
bone density, this needs monitoring and is a further worry.
For some of us, the
side effects are so bad that we cannot tolerate these treatments, and so in
consultation with our oncologists, we experiment with different versions of the
medication, and we try to address the side effects with counteractive
treatments. But this happens over months, even years, at a time, and the
longevity and relentlessness of it all becomes mentally challenging. For a few
of us, there comes a point where we just feel so awful that we decide not to
continue taking the drugs.
The difficulty is that, for these women, there just isn’t enough help in
managing the side effects. Our appointments are few and far between and all the
while we are expected to be fully functioning members of society – we are
employed, we are mothers, we are partners, we are carers, we are volunteers -
so how are we meant to maintain all that when coping with terrible side effects
every day? It is a shame that women give up these drugs without being given
enough proper support, which may enable them to feel better and find that they
can keep going after all.
How we asked, does Tamoxifen work, and how does it
impact on the brain?
Naz explained that Tamoxifen inhibits the
absorption of estrogen to cells that would otherwise be nourished by this
hormone, especially brain cells which need estrogen for healthy cognitive
functioning.
She told us that there is evidence that frontal and
temporal structures of the brain are affected most. These areas are involved in
everyday memory, our executive functions that enable us to ignore distractions
to focus, switch between tasks and update information in working memory.
Tamoxifen, Naz explained, has also been known to
interrupt “neurogenesis” which refers to the process by which the brain forms
new neural connections and re-generates itself.
Naz told us that overall, research conveyed the
simple message that Tamoxifen can contribute to impaired cognitive function.
While the evidence can be mixed at times, the general story conveys a similar
message in both post and pre-menopausal women.
We know that the brain shows under-activity in
areas that support healthy cognitive functioning when active treatment ends,
but then at times it has shown over-activity to recruit resources that are
needed to support daily functioning. Ultimately, more research is needed to see
what we can do to keep the effects of Tamoxifen and/or Aromatose Inhibitors on
cognitive function to a minimum.
In terms of the impact on our cognitive
function, the above explanation translates to the following symptoms: a foggy
brain, forgetfulness, poor concentration, lapses in attention; many of us
experience slow processing speed and difficulties in relation to retaining
information, particularly our short-term memory, our 'working memory' by which
we mean holding one task or piece of information in our mind while completing
another task, and, with our 'executive function' which is 'the CEO of the
brain' because it involves those skills which allow us to set goals, plan and
get things done.
Sometimes our mistakes are small and we laugh at ourselves, but more often our confidence gets undermined and we worry about our ability to function, that we might be seen as incompetent at work or that we are poor company.