Journal of Cellular Biochemistry 91:459–477 (2004)
Pathological and Molecular Mechanisms of ProstateCarcinogenesis: Implications for Diagnosis, Detection,Prevention, and Treatment
Angelo M. De Marzo,* Theodore L. DeWeese, Elizabeth A. Platz, Alan K. Meeker, Masashi Nakayama,Jonathan I. Epstein, William B. Isaacs, and William G. Nelson
Departments of Oncology, Pathology, Radiation Oncology, Urology,The Johns Hopkins University School of Medicine, and the Department of Epidemiology,Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
Prostate cancer is an increasing threat throughout the world. As a result of a demographic shift in
population, the number of men at risk for developing prostate cancer is growing rapidly. For 2002, an estimated 189,000prostate cancer cases were diagnosed in the U.S., accompanied by an estimated 30,200 prostate cancer deaths [Jemalet al., 2002]. Most prostate cancer is now diagnosed in men who were biopsied as a result of an elevated serum PSA(>4 ng/ml) level detected following routine screening. Autopsy studies [Breslow et al., 1977; Yatani et al., 1982; Sakret al., 1993], and the recent results of the Prostate Cancer Prevention Trial (PCPT) [Thompson et al., 2003], a large scaleclinical trial where all men entered the trial without an elevated PSA (<3 ng/ml) were subsequently biopsied, indicate theprevalence of histologic prostate cancer is much higher than anticipated by PSA screening. Environmental factors, such asdiet and lifestyle, have long been recognized contributors to the development of prostate cancer. Recent studies of themolecular alterations in prostate cancer cells have begun to provide clues as to how prostate cancer may arise andprogress. For example, while inflammation in the prostate has been suggested previously as a contributor to prostatecancer development [Gardner and Bennett, 1992; Platz, 1998; De Marzo et al., 1999; Nelson et al., 2003], researchregarding the genetic and pathological aspects of prostate inflammation has only recently begun to receive attention. Here, we review the subject of inflammation and prostate cancer as part of a ‘‘chronic epithelial injury’’ hypothesis ofprostate carcinogenesis, and the somatic genome and phenotypic changes characteristic of prostate cancer cells. We alsopresent the implications of these changes for prostate cancer diagnosis, detection, prevention, and treatment. J. Cell. Biochem. 91: 459–477, 2004. ß 2003 Wiley-Liss, Inc.
Key words: prostate cancer; prostateatrophy; prostatitis; benign prostatic hyperplasia; inflammation
cancers, including those affecting the liver,
esophagus, stomach, large intestine, and uri-nary bladder [Coussens and Werb, 2002]. In-
flammation might influence the pathogenesis of
sponsible for the development of many human
cancers by (i) inflicting cell and genome damage,(ii) triggering restorative cell proliferation toreplace damaged cells, (iii) elaborating a portfo-lio of cytokines that promote cell replication,angiogenesis and tissue repair [Coussens and
Grant sponsor: Public Health Services NIH/NCI; Grant
numbers: R01CA084997, R01CA70196; Grant sponsor:NIH/NCI Specialized Program in Research Excellence
Oxidative damage to DNA and other cellular
(SPORE) in Prostate Cancer (Johns Hopkins); Grant
components accompanying chronic or recurrent
inflammation may connect prostate inflamma-
*Correspondence to: Angelo M. De Marzo, Room 153,
tion with prostate cancer. In response to in-
Bunting-Blaustein Cancer Research Building, Sidney
fections, inflammatory cells produce a variety of
Kimmel Comprehensive Cancer Center at Johns Hopkins,
toxic compounds designed to eradicate micro-
1650 Orleans Street, Baltimore, MD 21231-1000. E-mail: [email protected]
organisms. These include superoxide, hydrogen
Received 16 September 2003; Accepted 17 September 2003
peroxide, singlet oxygen, as well as nitric
oxide that can react further to form the highly
reactive peroxynitrite. Some of these reactive
based studies is difficult to ascertain [Giovan-
oxygen and nitrogen species can directly inter-
nucci, 2001], (iii) the clinical diagnosis of chronic
act with DNA in the host bystander cells, or
prostatitis itself can be challenging and is often
react with other cellular components such as
subjective [Roberts et al., 1998]. Although large-
lipid, initiating a free radical chain reaction. If
scale prospective epidemiological studies are
the damage is severe, these compounds can
lacking [Giovannucci, 2001], a recent review of
kill host bystander cells as well as pathogens,
the available epidemiological literature by
Dennis et al. [2002] indicates that there may
among host cell survivors [Xia and Zweier,
be a small increase in the relative risk of the
1997; Eiserich et al., 1998]. As a consequence
development of prostate cancer in men with a
of an acquired defect in defenses against oxi-
history of clinical prostatitis. Given the high
dant and electrophilic carcinogens associated
prevalence of prostate cancer, however, even a
with GSTP1 CpG island hypermethylation (see
small increase in relative risk can result in a
below), prostate cells may acquire a heightened
susceptibility to oxidative genome damage in
In terms of the prevalence of clinical prostati-
an inflammatory milieu, leading to neoplastic
tis, a survey of clinical data in Olmstead county
transformation and cancer progression. Other
Minnesota reported that symptomatic prostati-
support for the concept that prostate cancer can
tis occurred in approximately 9% of men between
result from excess oxidants and electrophiles
40 and 79 years of age, with half of these men
comes from epidemiological studies suggesting
suffering more than one episode, and it was
that decreased prostate cancer risk is associated
estimated that 1 in 11 men will be diagnosed
with intake of various anti-oxidants and non-
with some form of prostatitis by age 79 years
steroidal anti-inflammatory drugs [Clark et al.,
[Roberts et al., 1998]. In terms of histological
1996, 1998; Heinonen et al., 1998; Norrish et al.,
prostatitis, inflammatory infiltrates of varying
1998; Gann et al., 1999; Nelson and Harris,
intensity and character are readily apparent in
2000; Roberts et al., 2002]. In further support
most radical prostatectomy [Gerstenbluth et al.,
of a critical role for oxidative genome damage
2002] and transurethral resection specimens
during the pathogenesis of prostate cancer,
[Nickel et al., 1999], and prostate needle biopsies
variant polymorphic alleles at OGG1, the gene
repairs the oxidized base 8-oxo-G in DNA, are
system of prostatitis divides the cases into four
associated with increased prostate cancer risk
categories–3 that are associated with genitour-
inary symptoms and 1 that is not [Krieger et al.,1999]. Category I, or acute bacterial prostatitis,is usually caused by Escherichia coli or other
gram-negative bacteria or enterococcus. Acute
bacterial prostatitis is infrequent and consists
At least three major disease processes are ex-
of an acutely swollen and tender prostate with
tremely common in the prostate—prostatitis,
acute inflammatory cells in expressed prostate
benign prostatic hyperplasia (BPH), and ade-
fluid. There is usually an associated urinary
nocarcinoma. Why do three apparently distinct
tract infection, and, at times systemic symp-
types of lesions occur so commonly in the same
toms of infection. Acute prostatitis is usually
organ, and might these common processes be
self-limited after treatment with antibiotics.
linked? Despite the fact that prostate inflam-
Category II, or chronic bacterial prostatitis, is
mation (histological prostatitis) and prostate
quite rare, and consists of repeated bouts of
cancer are often found in the same patient,
lower urinary tract infection where the source
associations between inflammation and pros-
of infection can be localized to the prostate.
tate cancer have not been clearly shown. This
This form is also usually treated with antibio-
may be due in part to the following difficulties
tics, often with multiple courses over time.
in performing association studies of prostate
Category III is the most common form, account-
cancer and prostatitis: (i) most prostate inflam-
ing for approximately 90% of clinical pros-
mation does not seem to cause symptoms [True
tatitis syndromes, and is referred to as chronic
et al., 1999], (ii) the incidence of asymptomatic
prostatitis/chronic pelvic pain syndrome. The
histologic prostatitis in non-selected population
cardinal feature of this entity is pain, either in
Pathological and Molecular Mechanisms of Prostate Carcinogenesis
the perineum, external genitalia, or other sites
BPH and prostate cancer has been reviewed
in the pelvis. There is also frequently pain
recently, where it was concluded that none of
during or after ejaculation. The symptoms
the epidemiologic studies published to date
must be of at least 3 months in duration to be
have provided clear evidence suggesting an
considered chronic. This form is subdivided into
etiologic role for BPH in the development of
those cases where leukocytes are identifiable
prostate cancer [Guess, 2001]. However, the
on expressed prostatic fluids, post-prostate
author also indicated that most of the studies
massage urine, or semen (category IIIA—
had at least some major bias and that it might
inflammatory) and those that do not contain
be perhaps more important to examine the biol-
leukocytes in these fluids (category IIIB—
ogy and pathology of any potential connection
chronic prostatitis/chronic pelvic pain syn-
drome). Category IV, or asymptomatic inflam-
In terms of pathobiology, Bostwick et al.
matory prostatitis, represents the presence of
prostate inflammation in histological tissue
prostate cancer tend to occur in the same pa-
sections from men with no history of urinary
tient, share similar hormonal requirements for
growth, and can occur in proximity. Pathologi-
In addition to the putative increased risk of
cally, it appears that transition zone cancers do
prostate cancer with a history of symptomatic
indeed appear to arise in the setting of nodules
prostatitis, an increased prostate cancer risk
of BPH [Bostwick et al., 1992; Leav et al., 2003,
has been associated in some studies [e.g., Hayes
and references therein], and occasionally from
et al., 2000] with sexually transmitted infec-
adenosis [Bostwick and Qian, 1995; Grignon
tions [reviewed in Strickler and Goedert, 2001;
and Sakr, 1996], which is also referred to as
Dennis and Dawson, 2002], independent of the
atypical adenomatous hyperplasia. While these
specific pathogen, supporting the concept that
transition zone tumors are often of somewhat
inflammation itself might facilitate prostatic
lower Gleason score, they are quite common in
carcinogenesis, or, that the associative causa-
tive organism(s) has not been identified. Of
[Leav et al., 2003]. Often in radical prostatec-
significance in this regard, two of the candidate
tomies transition zone cancers are found inci-
hereditary prostate cancer susceptibility genes
dentally after the diagnosis of prostate cancer in
identified thus far, RNASEL and MSR1, encode
the peripheral zone, which is much more widely
proteins that function in the host responses to a
sampled at needle biopsy. Whether there are an
variety of infectious agents [Zhou et al., 1997;
equal number of transition zone cancers in men
Platt and Gordon, 2001; Carpten et al., 2002; Xu
without significant nodular hyperplasia is cur-
rently not clear. Thus, although there is nostrong evidence linking the two, the relation
Relation of Prostate Cancer, Benign Prostatic
between BPH and prostate cancer remains an
open issue. In addition, it is possible that BPH
The fact that most prostate cancer and most
and prostate cancer are both caused by similar
inflammatory infiltrates are both present in the
exposures, such that they commonly occur to-
peripheral zone [McNeal, 1997] is consistent
gether but are not directly linked in a precursor-
with a link between inflammation and prostate
cancer. What about the transition zone, the site
What is the relation between transition zone
of development of BPH? Is there a link between
cancer and inflammation? While the relation
cancer is unknown, it is known that BPH tissue
Approximately 25% of prostate adenocarci-
contains a variable amount of chronic and often
nomas appear to arise in the transition zone.
acute inflammation in virtually 100% of speci-
Thus, while the peripheral zone is the site of
mens [Nickel et al., 1999]. It has been reported
origin of prostate cancer in the majority of the
cases, when compared to other organs that seem
correlates with the amount of tissue injury ass-
to be protected from cancer development (such
ociated with inflammation [Hasui et al., 1994;
as the seminal vesicles), prostate transition
Irani et al., 1997; Schatteman et al., 2000;
zone cancer is actually quite common. In terms
Yaman et al., 2003], and some have submitted
of epidemiological data, the relation between
that the pathogenesis [Gleason et al., 1993],
and/or clinical features [Nickel, 1994] of BPH
contain at least some increase in chronic and/or
may be related to prostate inflammation.
acute inflammation. Also, since the amount of
Still unclear, however, is whether inflam-
inflammation from field to field within a given
mation comes prior to BPH nodule formation
atrophy lesion can be highly variable we have
or whether it is a response to the altered tissue
recently suggested that to refer to a lesion as
architecture resulting from the nodules. While
PIA does not require easily recognizable inflam-
no firm conclusions can be drawn presently,
mation—thus, most forms of focal glandular
the pathological literature is consistent with a
atrophy can be considered PIA [Van Leenders
model whereby inflammation, due to infection
et al., 2003]. A working group to formalize
or otherwise, is related to the development or
terminology of the various atrophic lesions in
progression of BPH, and in some circumstances
the prostate is currently being formed, and a
BPH is related to prostate cancer. Although,
preliminary meeting with a group of patholo-
more study of this issue is required, it is
gists and other investigators was held at the
plausible that inflammation may be related to
In support of PIA as a prostate cancer pre-
cursor, prostate inflammation, accompanied by
focal epithelial atrophy, has been proposed to
Pathologists have long recognized focal areas
contribute to prostate cancer development in
of epithelial atrophy in the prostate [Rich, 1934;
rats [Reznik et al., 1981; Wilson et al., 1990].
Moore, 1936; Franks, 1954]. These focal areas
Further support comes from the fact that PIA
of epithelial atrophy, distinct from the diffuse
shares several molecular alterations found in
atrophy seen after androgen deprivation, usual-
both PIN and carcinoma. For example, chromo-
ly appear in the periphery of the prostate, where
some 8 gain, detected by fluorescence in situ
prostate cancers typically arise [Rich, 1934;
hybridization (FISH) with a chromosome 8 cen-
McNeal, 1988]. Many of these areas of epithelial
tromere probe, was found in human PIA, PIN,
atrophy are associated with acute or chronic
and prostate cancer [Macoska et al., 2000;
inflammation [Franks, 1954; McNeal, 1997;
Shah et al., 2001]. Others have recently docu-
Ruska et al., 1998; De Marzo et al., 1999],
mented rare p53 mutations in one variant of
contain proliferative epithelial cells [Liavag,
PIA, referred to as post-atrophic hyperplasia
1968; Feneley et al., 1996; Ruska et al., 1998; De
[Tsujimoto et al., 2002] and, our group has
Marzo et al., 1999; Shah et al., 2001], and may
recently shown that approximately 6% of PIA
show morphological transitions in continuity
lesions show evidence of somatic methylation
with high grade prostatic intraepithelial neo-
of the GSPT1 gene promoter [Nakayama et al.,
plasia (PIN) lesions [De Marzo et al., 1999;
2003a] (see description of GSTP1 promoter
Putzi and De Marzo, 2000], putative prostate
methylation below). While the cause of focal
cancer precursors [McNeal and Bostwick, 1986;
atrophy lesions is not known, they may arise
either as a consequence of epithelial damage,
lesions may show evidence of direct transitions
e.g., from infection, ischemia [Billis, 1998], or
to minute carcinoma lesions, with little or no
toxin exposure (including dietary oxidants/
recognizable PIN component [Franks, 1954;
electrophiles or endogenous chemicals such as
Liavag, 1968; Montironi et al., 2002; Nakayama
estrogens, etc.), followed by epithelial regenera-
et al., 2003]. Focal atrophy of the prostate exists
tion and associated secondary inflammation, or
as a spectrum of morphologies and areas con-
as a direct consequence of inflammatory oxidant
taining it in the prostate can be quite extensive.
damage to the epithelium [De Marzo et al.,
Most of these morphological patterns fit into the
1999]. The process of aging itself has been
categories of simple atrophy, or post-atrophic
suggested to contribute to some morphological
hyperplasia, as described by Ruska et al. [1998].
variants of prostate atrophy [McNeal, 1984].
Regardless of the etiology of PIA, the epithelial
inflammation and the unexpectedly high pro-
cells in these lesions exhibit many molecular
liferation index, we have put forth the term
signs of stress, expressing high levels of GSTP1,
proliferative inflammatory atrophy (PIA) to en-
compass these lesions [De Marzo et al., 1999]. In
Marzo et al., 1999; Putzi and De Marzo, 2000;
terms of the requirement for inflammatory cells
Parsons et al., 2001b; Zha et al., 2001]. There
in PIA, the majority of all focal atrophy lesions
is also mounting evidence that many of the
Pathological and Molecular Mechanisms of Prostate Carcinogenesis
atrophic luminal cells in PIA represent a form of
2001; Chung et al., 2001; Gao and Isaacs, 2002;
intermediate epithelial cell [Van Leenders et al.,
Meng and Dahiya, 2002]. In addition, genetic
2003]—cells with features intermediate be-
alterations appear to accumulate with prostate
tween basal and luminal secretory cells. Inter-
cancer progression. Small prostate cancers are
mediate epithelial cells have been postulated to
present in nearly 30% of men between 30–
be the targets of neoplastic transformation in
40 years of age in the U.S., though most men are
the prostate [Verhagen et al., 1992; De Marzo
diagnosed with prostate cancer at 50–70 years of
et al., 1998a,b; van Leenders et al., 2000].
age [Sakr et al., 1994]. The progression of these
It should be noted that not all authors have
small prostate cancers to larger life-threatening
found associations between prostate atrophy and
cancers, and the accumulation of somatic ge-
prostate cancer [McNeal, 1969; Billis, 1998;
nome abnormalities, appears sensitive to envir-
Anton et al., 1999; Billis and Magna, 2003], and
onmental factors and lifestyle. Prostate cancer
that in our own studies not all high grade PIN or
incidence and mortality are very high in the U.S.
small carcinoma lesions are associated with
cancer risks and death rates are characteristic
studies of the connection between atrophy and
of Asia [Miller, 1999; Hsing et al., 2000]. In
cancer have focused on peripheral zone cancer
support of an effect of environment and lifestyle
nearly exclusively. Thus, additional studies are
on prostate cancer development, Asian immi-
required to more fully understand the relation
grants to North America tend to acquire higher
between focal atrophy and cancer in the prostate.
prostate cancer risks within one generation
Our current concept is that PIA is a common
[Haenszel and Kurihara, 1968; Shimizu et al.,
proliferative response to environmental stimuli
1991; Whittemore et al., 1995]. Whether the
in aging men and that some high grade PIN and
appearance of somatic genome alterations in
carcinoma lesions arise as a consequence of
prostate cancer cells is the result of chronic or
genome damage in PIA, while others do not. A
recurrent exposure to genome-damaging stres-
corollary to this is that while only a subset of
atrophy lesions may be pre-neoplastic, the fact
damage, or a combination of both processes,
that atrophic areas can be so widespread and
multi-focal in the prostate is consistent with the
hypothesis that many prostate cancers canindeed arise from PIA.
encompassing the promoter region of GSTP1,encoding the p-class glutathione S-transferase
(GST), is an exceedingly common somatic ge-
nome change found in prostate cancer [Lee et al.,
1994; Millar et al., 1999; Lin et al., 2001; Nelson
Similar to other types of epithelial cancer,
et al., 2001b]. Immunohistochemistry has de-
prostate cancers contain many somatic genomic
monstrated that GSTP1 protein is normally
alterations, including point mutations, dele-
expressed in basal epithelial cells in the pros-
tions, amplifications, chromosomal rearrange-
tate, but is absent in most luminal columnar
ments, and changes in DNA methylation [Isaacs
secretory epithelial cells. In PIA lesions, strong
et al., 1994; Bookstein, 2001; Chung et al., 2001;
anti-GSTP1 staining is seen in many of the
Gao and Isaacs, 2002; Meng and Dahiya, 2002;
atrophic luminal epithelial cells, [De Marzo
DeMarzo et al., 2003]. However, unlike some
et al., 1999] consistent with the induction of
carcinomas such as those of the colon/rectum
expression in response to environmental stress.
[Kinzler and Vogelstein, 1997] and pancreas
The luminal cells in PIA are not simply basal
[Jaffee et al., 2002], where specific oncogenes
cells, as shown by their lack of expression of p63
such as k-ras or tumor suppressor genes such
[Parsons et al., 2001a]. In prostate cancer cells,
as p53 are mutated at a very high frequency,
gene mutations reported thus far in prostate
island sequences represses GSTP1 transcrip-
cancer appear quite heterogeneous, from case to
tion [Lin et al., 2001]. Absence of GSTP1
case, or even from lesion to lesion in a single case
[Isaacs et al., 1994; Mirchandani et al., 1995;
methylation are also common in high-grade
Qian et al., 1995; Ruijter et al., 1999; Bookstein,
GSTP1 is not a classical tumor suppressor
express high levels of the androgen receptor in
gene [Lin et al., 2001]. Rather, GSTP1 more
the prostate tend to develop PIN [Stanbrough
likely plays a ‘‘caretaker’’ role, protecting
et al., 2001]. Many somatic alterations of
prostate epithelial cells against genome dam-
been described in human prostate cancers,
Vogelstein, 1997]. For example, mice with both
particularly ‘‘androgen-independent’’ prostate
GSTP1 alleles disrupted by gene targeting
cancers appearing after treatment by andro-
exhibit increased skin tumor formation after
gen suppression and/or with anti-androgens
topical exposure to the skin carcinogen 7,12-
[Veldscholte et al., 1990; Newmark et al., 1992;
dimethylbenz [a] anthracene (DMBA) [Hender-
Suzuki et al., 1993, 1996; Gaddipati et al.,
son et al., 1998]. One prostate carcinogen that
1994; Schoenberg et al., 1994; Taplin et al.,
may be detoxified by GSTP1 is the dietary
1995, 1999; Visakorpi et al., 1995; Evans
heterocyclic amine, 2-amino-1-methyl-6-pheny-
et al., 1996; Tilley et al., 1996; Koivisto et al.,
limidazo [4,5-b]pyridine (PhIP), which forms
1997; Marcelli et al., 2000; Haapala et al.,
when meats are cooked at high temperatures or
2001]. ‘‘Androgen-independent’’ prostate can-
‘‘charbroiled’’ [Lijinsky and Shubik, 1964; Gross
cers usually continue to express the androgen
et al., 1993; Morgenthaler and Holzhauser,
receptor, maintaining androgen-receptor de-
1995; Knize et al., 1997]. Dietary PhIP intake
pendent signaling (i) in response to the reduced
causes prostate cancer in rats [Shirai et al.,
levels of circulating androgens, such as with AR
1997; Stuart et al., 2000]. In humans, a study
amplification accompanied by androgen recep-
examining the association between PhIP and
tor over-expression, (ii) in response to non-
other heterocyclic amine intake and prostate
androgens or anti-androgens as agonist ligands,
cancer showed a modest, albeit inconsistent
increased relative risk of prostate cancer with
altered androgen receptor ligand specificity, or
increasing consumption [Norrish et al., 1999],
(iii) via ligand-independent activation of the
although there are a large number of studies
androgen receptor, such as may occur under the
showing an association between an increased
influence of other intracellular signal transduc-
relative risk of overall prostate cancer and the
tion pathways [Veldscholte et al., 1990; van der
levels of consumption of red meat [reviewed in
Kwast et al., 1991; Culig et al., 1993; Nazareth
Kolonel, 2001]. In the most recent analysis from
and Weigel, 1996; Koivisto et al., 1997; Tan
the Health Professionals Follow-Up Study,
et al., 1997; Hobisch et al., 1998; Craft et al.,
consumption of red meats was not associated
1999; Amler et al., 2000; Sadar and Gleave,
with an increased risk of prostate cancer over-
all, but was associated with increased risk of
et al., 2001; Zegarra-Moro et al., 2002].
metastatic prostate cancer [Michaud et al.,
2001]. GSTP1 can protect prostate cells againstPhIP damage: for LNCaP prostate cancer cells,
NKX3.1, located at 8p21, encodes a prostate-
specific homeobox gene essential for normal
metabolically activated PhIP results in the
prostate development [Bieberich et al., 1996;
He et al., 1997; Sciavolino et al., 1997; Prescott
adducts. Replacement of the GSTP1 gene by
et al., 1998]. In mice, targeted disruption of
stable transfection prevented PhIP–DNA dam-
Nkx3.1 leads to prostatic epithelial hyperplasia
age [Nelson et al., 2001a]. GSTP1 may also
protect prostate cells against damage inflicted
Abdulkadir et al., 2002]. In men, although loss
directly by oxidants, such as those produced by
of 8p21 DNA sequences has been reported in as
protracted low dose ionizing radiation exposure
many as 63% of PIN lesions and in more than
(DeWeese et al., unpublished observations).
90% of prostate cancers, no NKX3.1 mutationshave been detected, leading to controversy over
whether NKX3.1 is the gene target of somatic
alteration at 8p21 [Emmert-Buck et al., 1995;
receptor (AR) both play critical roles in normal
He et al., 1997; Voeller et al., 1997; Ornstein
prostate development and function, and in most
et al., 2001]. Nonetheless, loss of NKX3.1 ex-
prostate diseases, including prostate cancer.
pression has been reported in as many as 20% of
For example, transgenic mice engineered to
PIN lesions, 6% of low stage prostate cancers,
Pathological and Molecular Mechanisms of Prostate Carcinogenesis
22% of high stage prostate cancers, 34% of
and Pten genes, haploinsufficiency for PTEN
androgen-independent prostate cancers, and
and/or NKX3.1 may be sufficient for a neo-
plastic phenotype [Bhatia-Gaur et al., 1999;
et al., 2000]. The relationship between somatic
Podsypanina et al., 1999; Di Cristofano et al.,
NKX3.1 alterations and reduction in NKX3.1
expression during prostate cancer development
PTEN, located at 10q, another site of frequent
gene target for alteration during prostatic
allelic loss in prostate cancer, encodes a phos-
carcinogenesis. Targeted disruption of Cdkn1b
phatase active against both proteins and lipid
in mice results in prostatic hyperplasia, while
substrates [Li et al., 1997; Myers et al., 1997,
1998; Steck et al., 1997; Teng et al., 1997]. PTEN
alleles develop localized prostate cancers [Di
has been proposed to function as a general
Cristofano et al., 2001]. Reduced p27 expres-
tumor suppressor by inhibiting the phospha-
sion appears characteristic of human prostate
tidylinositol 30-kinase/protein kinase B (PI3K/
cancer cells, particularly in prostate cancer
Akt) signaling pathway, thought to be essential
cases with a poor prognosis [Guo et al., 1997;
for cell cycle progression and/or cell survival in
Cheville et al., 1998; Cordon-Cardo et al., 1998;
many cell types [Li et al., 1997; Furnari et al.,
Yang et al., 1998; De Marzo et al., 1998a].
1998; Ramaswamy et al., 1999; Sun et al., 1999].
Somatic loss of DNA sequences at 12p12-13,
Like mice carrying disrupted Nkx3.1 alleles,
near CDKN1B, have been reported for 23% of
mice carrying disrupted Pten alleles manifest
localized prostate cancers, 30% of prostate
prostatic hyperplasia and dysplasia, and the
progeny of breeding crosses between PtenÆ
prostate cancer distant metastases [Kibel
mice and Nkx3.1Æ mice develop PIN [Bhatia-
et al., 2000]. The mechanism(s) by which soma-
Gaur et al., 1999; Podsypanina et al., 1999; Di
tic CDKN1B alterations leads to reduced p27
Cristofano et al., 2001; Kim et al., 2002], as well
expression have not been elucidated. Provoca-
as invasive carcinoma and lymph node metas-
tively, p27 may be a target for repression by the
tases [Abate-Shen et al., 2003]. PTEN, which is
PI3K/Akt signaling pathway [Li and Sun, 1998;
typically expressed by normal epithelial cells,
Sun et al., 1999; Graff et al., 2000; Gottschalk
is often expressed at a reduced level in hu-
et al., 2001]. Thus, loss of PTEN function,
man prostate cancer cells [McMenamin et al.,
accompanied by increased PI3K/Akt signaling,
1999]. Many somatic PTEN alterations have
been reported for prostate cancers, including
and in p27 protein half-life [Nakamura et al.,
homozygous deletions, loss of heterozygosity,
2000] Decreased p27 expression has also been
mutations, and suspected CpG island hyper-
documented in high grade PIN [De Marzo et al.,
methylation [Cairns et al., 1997; Li et al., 1997;
1998a; Fernandez et al., 1999] and in PIA
Myers et al., 1997, 1998; Steck et al., 1997; Teng
lesions [De Marzo et al., 1998a; Van Leenders
et al., 1997; Gray et al., 1998; Suzuki et al., 1998;
Wang et al., 1998; Vivanco and Sawyers, 2002].
Associations between somatic PTEN altera-
tions and aberrant PTEN function in prostatecancer cells have been difficult to establish.
The karyotype of most human cancers is ab-
Often, losses of 10q sequences near PTEN do not
normal. Many types of cancer, including prostate
appear to be accompanied by somatic mutations
cancer, show chromosomal instability reflected
of the remaining PTEN allele. Furthermore,
by aberrations in both number and structure of
chromosomes. The exceptions to this in solid
more common in metastatic than in primary
tumors are cancers with microsatellite instabil-
prostate cancer lesions, a marked heterogeneity
ity, which are genetically unstable at the single
in PTEN defects in different metastatic sites
nucleotide level but contain mostly diploid
karyotypes. Chromosomal instability appears
[Suzuki et al., 1998]. Perhaps, as is evident
to be an important molecular mechanism driv-
in mouse models featuring disrupted Nkx3.1
ing malignant transformation in many human
epithelial tissues [Cahill et al., 1999], yet the
prostate carcinogenesis. Interestingly, the telo-
molecular mechanisms responsible for chromo-
mere shortening found in high grade PIN was
some destabilization during carcinogenesis are
restricted to the luminal cells and was not
largely unknown. One route to chromosomal
present in the underlying basal cells. This
instability is through defective telomeres [Coun-
finding strongly suggests that basal cells are
ter et al., 1992; Hackett and Greider, 2002;
not the direct precursor cell to high grade PIN,
Feldser et al., 2003]. Telomeres, which consist of
but support the above mentioned concept that
multiple repeats of a 6 base pair unit (TTAGGG),
cells with an intermediate luminal cell pheno-
complexed with several different binding pro-
type are the likely direct target cell of transfor-
teins, protect chromosome ends from fusing with
mation in the prostate. Vukovic et al., recently
other chromosome ends or other chromosomes
reported Similar findings of reduced telomere
containing double strand breaks [McClintock,
length in high grade PIN and prostate cancer
1941]. However, in the absence of compensatory
mechanisms, telomeric DNA is subject to loss
due to cell division [Harley et al., 1990; Levyet al., 1992] and possibly oxidative damage [von
Alterations in gene expression accompany-
Zglinicki et al., 2000]. Critical telomere short-
ing the development of prostate cancer have
ening leads to chromosomal instability that, in
been surveyed using transcriptome profiling
technologies [Huang et al., 1999; Walker et al.,
incidence that is likely a result of chromosome
1999; Nelson et al., 2000; Xu et al., 2000;
fusions, subsequent breakage, and rearrange-
Dhanasekaran et al., 2001; Luo et al., 2001,
ment [Blasco et al., 1997; Artandi et al., 2000].
2002; Magee et al., 2001; Stamey et al., 2001;
Intriguingly, telomeres within human carcino-
Waghray et al., 2001; Welsh et al., 2001]. Among
mas are often found to be abnormally reduced in
the many genes exhibiting over- or under-
expression in localized prostate cancers, the
products of at least two genes appear consis-
human prostate cancer, the telomeres from
tently increased. Hepsin, located at 19q11-13.2,
prostate cancer tissue were consistently shorter
encodes a transmembrane serine protease, nor-
than those from cells in either the adjacent
mally expressed at high levels in the liver and
normal or BPH tissues [Sommerfeld et al., 1996].
other tissues [Tsuji et al., 1991]. The contribu-
Others have also reported telomere shortening in
tion of hepsin to the prostate cancer phenotype
prostate cancer [Donaldson et al., 1999].
has not been discerned. Anti-sense oligonucleo-
Most carcinomas arise from pre-invasive int-
tides targeting Hepsin mRNA have been re-
raepithelial precursor lesions, referred to as in-
ported to retard the growth of hepatoma cells,
traepithelial neoplasias (IEN) [O’Shaughnessy
but HepsinÀ/À mice develop normally, exhibit
et al., 2002]. These lesions show morphological
normal liver regeneration, and have no striking
features and molecular alterations characteris-
phenotype [Torres-Rosado et al., 1993; Wu et al.,
tic of malignant neoplasia, including evidence of
1998; Yu et al., 2000]. a-Methylacyl-CoA race-
genetic instability [Shih et al., 2001] but occur
mase, a mitochondrial and peroxisomal enzyme
within preexisting epithelia and are confined
that acts on pristanoyl-CoA and C27-bile acyl-
within the basement membrane. If genetic in-
CoA substrates to catalyze the conversion of
stability helps to drive cancer formation, and
R- to S-stereoisomers in order to permit meta-
telomeres shortening is a major mechanism
bolism by b-oxidation [Schmitz et al., 1995], has
leading to genetic instability, then telomere
been reported to be over-expressed in almost all
shortening should be present at the intraepithe-
prostate cancers [Xu et al., 2000; Dhanasekaran
lial phase of carcinoma. Recently we employed
et al., 2001; Luo et al., 2001, 2002]. Germline
an in situ telomere FISH technique TEL-FISH
AMACR mutations have been reported to lead to
and reported that telomere shortening is evid-
adult-onset neuropathy [Ferdinandusse et al.,
ent in the majority of high-grade prostatic
intraepithelial neoplasia (PIN) lesions [Meeker
revealed that a-methylacyl-CoA racemase is
et al., 2002], which are thought to be cancer
occasionally present in normal prostate cells,
precursor lesions of the prostate. Thus, telomere
increased in prostatic intraepithelial neoplasia
shortening is a prevalent biomarker in human
cells, and further elevated in prostate cancer
prostate, occurring early in the process of
cells [Jiang et al., 2001, 2002; Beach et al., 2002;
Pathological and Molecular Mechanisms of Prostate Carcinogenesis
Luo et al., 2002; Rubin et al., 2002; Yang et al.,
contains basal cells [Hedrick and Epstein,
2002; Leav et al., 2003; Magi-Galluzzi et al.,
1989]. More recently it has been shown that
2003; Zhou et al., 2003a]. Another gene product
the product of the p63 gene is expressed in basal
shown to be increased at the mRNA level in
cell nuclei in the prostate, but not in prostate
primary and hormone refractory metastatic
luminal cells nor in the vast majority of prostate
prostate cancer using gene expression arrays
cancers [Signoretti et al., 2000; Parsons et al.,
is the polycomb group protein enhancer of zeste
2001a]. Since this marker may be more robust
homolog 2 (EZH2), which has been postulated to
in terms of surviving poor fixation or various
be involved in the progression of prostate cancer
types of tissue processing [Weinstein et al.,
2002], many pathologists have begun to employp63 staining in clinical practice to furtherdetermine whether basal cells may be present
in a suspicious lesion [Shah et al., 2002]. To
increase the chances of finding basal cells, Zhou
et al. [2003b] have recently suggested using acocktail of antibodies against basal cell cyto-
It is estimated that approximately 1,000,000
by a large number of different investigators to
prostate needle biopsies are performed per year
be overexpressed in prostate cancer cells. Since
in the U.S., and approximately 20% are positive
negative staining for basal cell markers by itself
for cancer. While there is no standard for the
is not diagnostic of prostate cancer, positive
number of cores taken, in many institutions
staining for AMACR may increase the level of
urologists are submitting 12 or more cores per
confidence in establishing a definitive malig-
patient, which is up from 6 several years ago.
nant diagnosis in a lesion deemed highly sus-
Thus, between 6 and 12 million individual new
picious by standard H&E staining [Jiang et al.,
needle biopsy cores are examined microscopi-
2001, 2002; Beach et al., 2002; Magi-Galluzzi
cally by pathologists each year in the U.S. While
et al., 2003; Zhou et al., 2003a]. Thus, many
at times the diagnosis of prostate cancer on
pathologists have begun to employ this marker.
needle biopsy can be quite straightforward,
At our institution we routinely order the p63,
many cases present diagnostic challenges. For
34BE12 (also referred to as keratin 903), and
AMACR on atypical prostate needle biopsies
prostate cancer that can be misdiagnosed as
where the suspicion of cancer is high but
prostate cancer [Epstein, 1995; Epstein and
the findings on H&E section are insufficient
Potter, 2001; DeMarzo et al., 2003]. These in-
to render a clearly malignant diagnosis. In
clude lesions such as atrophy adenosis (atypical
the research setting, we have also employed
adenomatous hyperplasia), PIN, nephrogenic
double labeling against p63 (nuclear staining
adenoma granulomatous prostatitis, and radia-
positive in basal cells) and racemase (cytoplas-
tion change in benign glands. It has been clear
mic-only staining) in order to delineate both
for many years that prostate basal cells, which
markers on an individual tissue sections [Luo
are uniformly present in normal appearing
et al., 2002], although this double labeling can
prostate acini and ducts, and in the vast
be somewhat problematic on needle biopsies
majority of benign mimics of prostate cancer,
due to background cytoplasmic staining for p63.
are absent in prostate cancer [Brawer et al.,
As usual with any ancillary test, there are
1985]. Thus, ancillary tools such as immuno-
pitfalls in the use of AMACR in diagnostic
histochemistry against ‘‘basal cell specific cyto-
pathology, since certain histological subtypes of
keratins’’1 are often employed in difficult cases
prostatic adenocarcinoma tend to be weak or
to determine if a particular suspicious lesion
negative for this marker [Zhou et al., 2003a],and, benign glands and high grade PIN may bepositive at times. Since there are so many
1Often staining for basal cells is performed with the
diagnostic pitfalls in prostate needle biopsies,
monoclonal antibody 34BE12, recognizing a range of high
the importance of obtaining second opinions on
molecular weight cytokeratins including keratin 5 and 14. These keratins are highly expressed in basal cells. Other
prostate biopsy material has been emphasized
antibodies against keratin 5 have also been employed.
sues, has been shown to reduce aflatoxin B1
damage when administered to a human clini-cal study cohort at high risk for aflatoxin ex-
Abnormal genes and gene products appearing
posure and liver cancer development in China
in prostate cancer cells offer great promise as
[Jacobson et al., 1997; Kensler et al., 1998;
disease biomarkers. For example, GSTP1 CpG
Wang et al., 1999]. Sulforaphane, an isothio-
island hypermethylation, detected in prostate
cyanate present in high amounts in cruciferous
tissue, blood, urine, or prostate fluid, may be a
vegetables, is also a potent inducer of carcino-
molecular biomarker useful for prostate cancer
gen-detoxification enzymes [Zhang et al., 1992,
detection and staging. Although GSTP1 CpG
1994]. Diets rich in carcinogen-inducers like
island hypermethylation has been found in
sulforaphane have been associated with de-
creased cancer risks [Cohen et al., 2000].
prostate cancers, approximately 70% of liver
Such carcinogen-detoxification enzyme indu-
cers need to be developed and tested in prostate
cancers, this genome alteration has not been
detected in DNA from any normal tissues [Lee
The recognition that prostate inflammation
et al., 1994; Esteller et al., 1998; Tchou et al.,
may contribute to the earliest steps in prostate
2000; Lin et al., 2001; Nakayama et al., 2003].
carcinogenesis also has profound implications
GSTP1 CpG island hypermethylation has also
for the prevention of prostate cancer. Animal
been detected in 70% of PIN lesions [Brooks
model studies suggest that non-steroidal anti-
et al., 1998; Nakayama et al., 2003a]. For a
inflammatory drugs might attenuate both pros-
comprehensive review of GSTP1 methylation as
tate cancer incidence and prostate cancer
a biomarker in prostate cancer, see the accom-
progression [Wechter et al., 2000]. In addition,
panying article by Nakayama et al. [2003b].
several epidemiology studies have hinted at amodest protective effect of non-steroidal anti-
inflammatory drug intake on either prostate
cancer incidence, or on prostate cancer progres-
Insights into the molecular pathogenesis of
sion [Norrish et al., 1998; Nelson and Harris,
prostate cancer may provide opportunities for
2000; Habel et al., 2002; Leitzmann et al., 2002;
the discovery and development of new agents
Roberts et al., 2002]. One target of these drugs,
for prostate cancer prevention. Loss of GSTP1
cyclo-oxygenase-2 (COX-2), may be selectively
‘‘caretaker’’ activity during prostate carcinogen-
expressed in PIA lesions in the prostate [Zha
esis emphasizes the critical role of carcinogen
et al., 2001]. A randomized clinical trial in-
metabolism in protecting prostate cells ag-
volving the administration of celecoxib, a selec-
ainst neoplastic transformation, and suggests
tive COX-2 inhibitor, or placebo to men with
that therapeutic compensation for inadequate
prostate cancer who undergo radical pros-
GSTP1 ‘‘caretaker’’ function may help prevent
tatectomy, has been initiated at the Sidney
prostate cancer. The ‘‘oxidation tolerance’’ phe-
notype associated with loss of GSTP1 ‘‘care-
Johns Hopkins. The effects of COX-2 inhibition
taker’’ function in LNCaP prostate cancer cells
may provide a mechanistic rationale for but-
other tissue markers will be ascertained. In the
tressing defenses against oxidative genome
future, as the process of inflammation in the
damage via anti-oxidant supplementation to
prostate, and the pathogenesis of PIA becomes
better defined more specific targets will be
In addition, augmentation of carcinogen-detox-
identified, creating new opportunities for the
ification capacity, using a variety of such
discovery and development of selective inhibi-
chemoprotective compounds, including isoth-
tors of pathways mediating prostate cell and
iocyanates, 1,2-dithiole-3-thiones, terpenoids,
etc., is known to prevent a range of different
cancers in different animal models by triggering
the expression of many different carcinogen-
detoxification enzymes [Kensler, 1997; Ramos-Gomez et al., 2001]. Oltipraz, an inducer of
Finally, progressive elucidation of the mo-
carcinogen-detoxification enzymes in liver tis-
lecular mechanisms contributing to prostate
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EL ENCOD BOLETIN SOBRE POLÍTICAS DE DROGAS EN EUROPA Nr. 8 – AGOSTO DE 2005 CONSTRUYENDO LA MASA CRÍTICA La democracia está en peligro serio no cuando unos pocos la atacan, sino cuando lasautoridades no la defienden. Si la reacción del gobierno estadounidense a losatentados del 11 de septiembre de 2001 hubiera sido aislar y capturar a losresponsables, hoy hubiera menos gente en el m