Estrogen receptors in lung cancer
studies of sex differences in lung cancer risk and disease
presentation recommend that estrogens could be concerned within the
aetiology of this disease. 74 for instance, female patients are
a lot of probably to present with adenocarcinoma of the lung and
to be never-smokers compared to male patients. 75 as detailed
previously, knowledge have recently emerged that the speed of
diagnosis of lung cancer in never-smoking ladies is higher
than in never-smoking men. 76 ers, members of the nuclear
steroid receptor superfamily, mediate cellular response to
estrogen. 2 forms of the er are identified, er
and er , that are encoded by separate genes and display
totally different tissue distributions. these proteins gathering either
as ligand-activated transcription factors or will be activated
by phosphorylation freelance of ligand ( fig. 25. four ). 77
there are inconsistent results reported concerning
the presence of ers in lung tumors. with the identification of
antibodies that distinguish between er and er and more
customary immunohistochemical procedures, it's currently clear that
er is expressed and functional in most human nsclc cell
lines and that is present in primary specimens of human nsclcs
from each men and ladies. 78–82 there's less consensus on
the expression of er within the lung. er was mainly found in
the cytoplasm and membrane in immunohistochemical studies
and was found to be comprised of mostly alternatively spliced
variants based mostly on immunoblot and rna analysis. 78 this nonnuclear
er pool could be comprised of a variant isoform that
lacks the amino-terminus, as a result of it's differentially detected
by antibodies that recognize the er amino- and carboxyterminal.
79 er , on the opposite hand, was found mainly localized
to the nucleus with a few cytoplasmic staining also
observed and to be comprised of mainly full-length protein in
addition to a few variants. 78 er-mediated rna transcription
and proliferation in lung tumor cell lines support the hypothesis
that a minimum of a few forms of er are functional. 78
many reports relating er standing to nsclc patient survival
are completed. nuclear localization of er was observed
in 45. 8% to six9% of lung cancer cases 79–82 and located to
be a favorable prognostic indicator during all studies. in a few cases,
the prognostic significance was no more than observed in male patients.
nuclear er expression is either never detected or rarely detected
in nsclc patient tumors. 79–83 prognostic significance
of er was shown to own either no result on survival or to
correlate with poor prognosis. 79, eighty kawai et al. 79 reported that
the presence of cytoplasmic er and therefore the absence of er may be associated
with worse prognosis among nsclc patients. patients
at higher risk at histopathologic stage i were those with no er
expression. 79 these results are opposite of what has been demonstrated
for er standing and prognosis of breast cancer patients. 84, 85
whether or not or not this relationship is observed in different patient
populations isn't known at the present time, and therefore the specificity
of a few er antibodies has been disputed. clearly, both
nuclear and cytoplasmic ers are vital, and every component
ought to be assessed separately and along, when examining
patient tissue specimens for clinical analysis.
studies of sex differences in lung cancer risk and disease
presentation recommend that estrogens could be concerned within the
aetiology of this disease. 74 for instance, female patients are
a lot of probably to present with adenocarcinoma of the lung and
to be never-smokers compared to male patients. 75 as detailed
previously, knowledge have recently emerged that the speed of
diagnosis of lung cancer in never-smoking ladies is higher
than in never-smoking men. 76 ers, members of the nuclear
steroid receptor superfamily, mediate cellular response to
estrogen. 2 forms of the er are identified, er
and er , that are encoded by separate genes and display
totally different tissue distributions. these proteins gathering either
as ligand-activated transcription factors or will be activated
by phosphorylation freelance of ligand ( fig. 25. four ). 77
there are inconsistent results reported concerning
the presence of ers in lung tumors. with the identification of
antibodies that distinguish between er and er and more
customary immunohistochemical procedures, it's currently clear that
er is expressed and functional in most human nsclc cell
lines and that is present in primary specimens of human nsclcs
from each men and ladies. 78–82 there's less consensus on
the expression of er within the lung. er was mainly found in
the cytoplasm and membrane in immunohistochemical studies
and was found to be comprised of mostly alternatively spliced
variants based mostly on immunoblot and rna analysis. 78 this nonnuclear
er pool could be comprised of a variant isoform that
lacks the amino-terminus, as a result of it's differentially detected
by antibodies that recognize the er amino- and carboxyterminal.
79 er , on the opposite hand, was found mainly localized
to the nucleus with a few cytoplasmic staining also
observed and to be comprised of mainly full-length protein in
addition to a few variants. 78 er-mediated rna transcription
and proliferation in lung tumor cell lines support the hypothesis
that a minimum of a few forms of er are functional. 78
many reports relating er standing to nsclc patient survival
are completed. nuclear localization of er was observed
in 45. 8% to six9% of lung cancer cases 79–82 and located to
be a favorable prognostic indicator during all studies. in a few cases,
the prognostic significance was no more than observed in male patients.
nuclear er expression is either never detected or rarely detected
in nsclc patient tumors. 79–83 prognostic significance
of er was shown to own either no result on survival or to
correlate with poor prognosis. 79, eighty kawai et al. 79 reported that
the presence of cytoplasmic er and therefore the absence of er may be associated
with worse prognosis among nsclc patients. patients
at higher risk at histopathologic stage i were those with no er
expression. 79 these results are opposite of what has been demonstrated
for er standing and prognosis of breast cancer patients. 84, 85
whether or not or not this relationship is observed in different patient
populations isn't known at the present time, and therefore the specificity
of a few er antibodies has been disputed. clearly, both
nuclear and cytoplasmic ers are vital, and every component
ought to be assessed separately and along, when examining
patient tissue specimens for clinical analysis.
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