
Cancer Epidemiology Biomarkers & Prevention Vol. 9, 225-227, February 2000
© 2000 American Association for Cancer Research
The p53 Arg72Pro Polymorphism, Human Papillomavirus, and Invasive Squamous Cell Cervical Cancer1
Margaret M. Madeleine2,
Katherine Shera,
Stephen M. Schwartz,
Janet R. Daling,
Denise A Galloway,
Gregory C. Wipf,
Joseph J. Carter,
Barbara McKnight and
James K. McDougall
Programs in Epidemiology [M. M. M., S. M. S., J. R. D.], and Cancer Biology, [K. S., D. A. G., G. C. W., J. J. C., J. K. M.], Fred Hutchinson Cancer Research Center, Seattle, Washington 98109-1024; Departments of Epidemiology [S. M. S., J. R. D.] and Biostatistics, [B. M.], School of Public Health and Community Medicine, University of Washington, Seattle, Washington 98195; and Departments of Microbiology [D. A. G.], and Pathology, [J. K. M.], School of Medicine, University of Washington, Seattle, Washington 98195
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Abstract
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A. Storey et al. [Nature (Lond.), 393:
229234, 1998)] reported a 7-fold increased risk of cervical cancer
associated with having an Arg/Arg polymorphism at codon 72 of p53
compared with the Pro/Arg heterozygotes (odds ratio, 7.4; 95%
confidence interval, 2.129.4). Complementary in vitro
studies suggested that the HPV E6 oncoprotein more readily targets the
arginine form, as opposed to the proline form, of p53 for degradation.
We investigated the impact of this polymorphism in a population-based
case-control study of invasive cervical cancer. Using a PCR assay to
detect the p53 codon 72 polymorphism, we tested blood samples from 111
women with invasive squamous cell cancer of the cervix identified by a
population-based registry and 164 random-digit telephone-dialed
controls. The distribution of the genotype among control women was 38%
heterozygous, 7% proline homozygous, and 55% arginine homozygous, and
among the cases was 38%, 6%, and 56%, respectively. There was no
increased risk of squamous cell invasive cervical cancer associated
with homozygosity for the arginine allele (odds ratio, 1.0; 95%
confidence interval, 0.61.7). Furthermore, there was no modification
of this result by human papillomavirus (HPV) DNA status of the tumor,
age, or smoking status. Among controls, there was no association
between the polymorphism and HPV-16 L1 seropositivity. However, among
case subjects, the codon 72 polymorphism may be related to HPV 16L1
seropositivity status.
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Introduction
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HPV3
is almost certainly the primary etiologic agent of cervical cancer, yet
few women infected with HPV go on to develop cancer. In a recent
report, Storey et al. (1)
describe a 7-fold
increased risk of cervical cancer associated with the p53 Arg72Pro
polymorphism. Complementary in vitro studies suggested that
the HPV E6 oncoprotein, which binds p53 (2)
and promotes
its degradation (3)
, might more readily target the
arginine form as opposed to the proline form of p53 for degradation. We
investigated the association between the p53 Arg72Pro polymorphism and
the risk of invasive squamous cell cancer of the cervix in a sample of
participants from a large population-based case-control study.
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Materials and Methods
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The methods of the larger study, described in detail in Daling
et al. (4)
, are briefly outlined here. Case
subjects were identified by the Cancer Surveillance System, a
population-based cancer registry serving western Washington State that
is part of the SEER Program. The SEER Program is part of the United
States National Cancer Institute and has monitored cancer incidence and
mortality in a 10% sample of the United States population in nine
geographic areas since 1973. Population-based control subjects were
identified by using random-digit dialing and were frequency matched to
case subjects by age. All of the subjects were residents of an urban,
three-county area that included Seattle. The interview response rate in
the parent study was 65% for case subjects and 72% for control
subjects. We restricted the present investigation to white women to
reduce the potential for our results to be influenced by differences in
the genotypic frequency by race. The present study represents 18.0%
percent of the white cases and 15.9% of the white controls in the
parent study. The mean age of cases was 43.0 and that of controls was
43.6.
Serum and buffy coat samples were collected at the in-person
interview, and archival tumor tissue was obtained for case subjects.
Previously published methods were used to determine HPV-16
seroprevalence by a virus-like particle ELISA (5)
and HPV
DNA prevalence in archival tumor tissue by PCR (4)
. Among
those who gave a buffy-coat sample at interview and met the study
restrictions (i.e., white race for all of the subjects and
squamous cell histology for case subjects), a sample was randomly
chosen for DNA extraction. The present study made use of DNA extracted
from peripheral leukocytes from 111 case and 164 control subjects.
The PCR assay used to detect the two codon 72 alleles of p53
was performed as described by Storey et al.
(1)
, with minor modifications. DNA was extracted from 1 ml
of buffy coat sample using the QIAamp Blood Kit (QIAGEN, Chatsworth,
CA) following the instructions provided by the manufacturer. p53
arginine and proline sequences were amplified from each DNA sample in
separate reactions (30 cycles) using 30 ng of genomic DNA as template,
12.5 pmol of each primer, and 1.25 units each of Amplitaq DNA
polymerase (PE Applied Biosystems, Foster City, CA) and platinum Taq
antibody (Life Technologies, Gaithersburg, MD). Annealing temperatures
and MgCl2 concentrations were 55°C/1.0
mM and 64°C/1.5 mM for
the arginine and proline amplifications, respectively. Genomic DNA
extracted from a vulvar carcinoma cell line, A431 (6)
, or
from the peripheral blood of an individual whose genotype was
determined by sequencing served as positive controls for amplification
of the p53 proline and arginine alleles, respectively.
The relative risk of cancer was estimated using the OR approximation by
exponentiation of coefficients obtained from multiple logistic
regression analysis using EGRET (7)
. The
2 test was used to compare the proportions of
the p53 codon 72 genotypes between HPV-16 DNA positive cases
and controls (with unknown HPV DNA status) and between HPV-16 L1
serology status of cases and controls (Epi Info; Ref. 8
).
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Results
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The prevalence of the homozygous arginine allele was virtually
identical in case and control subjects in this population (Table 1)
. The genotype frequencies in both populations are in Hardy-Weinberg
equilibrium. Overall, there was neither an increased risk of invasive
squamous cell cervical cancer associated with the arginine homozygous
allele compared with the heterozygous allele in this study (OR, 1.0;
95% CI, 0.61.7) nor a decreased risk associated with the proline
homozygous allele (OR, 0.9; 95% CI, 0.32.6). Among the 45 cases
positive for HPV 16 DNA, the distribution of the p53 codon
72 alleles was not different from the distribution seen among the
controls (
2 on 2 df, 1.3;
P = 0.518). Furthermore, there was no increase in the
relative risk of cervical cancer associated with arginine homozygosity
as compared with heterozygosity between subgroups defined by age [<45
years (OR, 0.8; 95% CI, 0.41.6) and
45 years (OR, 1.3; 95% CI,
0.62.8)], cigarette smoking status [never (OR, 1.2; 95% CI,
0.62.7), former (OR, 0.9; 95% CI, 0.32.4), and current (OR, 0.8;
95% CI, 0.32.2)], or HPV-16 L1 serology [seronegative (OR, 0.6;
95% CI, 0.31.3) and seropositive (OR, 1.5; 95% CI, 0.73.0)].
There was a difference in the distribution of the genotypes among case
subjects according to their HPV-16 L1 serological status (Table 2)
. Nearly 64% of seropositive case subjects were homozygous for the
arginine allele compared with only 44% of the seronegative case
subjects (
2 on 2 df, 5.70;
P = 0.058). In contrast, there was no difference in the
distribution of the Arg/Arg genotype among control subjects
when grouped as HPV-16 L1 seronegative or seropositive
(
2 on 2 df, 1.06; P = 0.588).
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Discussion
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Many groups have attempted to repeat the findings of Storey
et al. (1)
because it was thought that
the potential for increased degradation of p53 by the E6 oncoprotein
might contribute substantially to the risk of progression to cervical
cancer. Most subsequent reports, however, found no increased risk of
cervical cancer associated with the p53 Arg72Pro polymorphism
(9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
. In these reports, the relative risk of invasive
cervical cancer associated with the Arg/Arg genotype
compared with the heterozygous genotype ranged from 0.7 (95% CI,
0.31.3; Ref. 9
) to 1.6 (95% CI, 0.64.4; Ref.
15
). The distribution of the Arg/Arg polymorphism ranged
from 40% (19)
to 63%
(9)
among control women in these
studies. Specifically, the prevalence of the Arg/Arg
genotype was 50% or greater in control subjects from studies conducted
in the United Kingdom (9, 10, 11)
, Norway (12)
,
Sweden (13)
, the United States (14)
, the
Netherlands (15)
, Hungary (16)
, Italy
(17)
, Germany (18)
, and in the present United
States study (63%, 57%, 57%, 54%, 50%, 52%, 57%, 60%, 56%,
56%, and 56%, respectively). The distribution of the
Arg/Arg genotype was less than 50% among control subjects
in the Japanese (19)
and Costa Rican (14)
populations (36% and 45%, respectively), as well as in the initial
United Kingdom report (37%; Ref. 1
).
In the only published study to support the initial findings, Zehbe
et al. (20)
reported an increased risk of
invasive cervical cancer associated with the Arg/Arg
genotype compared with the heterozygous genotype of 3.8 (95% CI,
1.115.1) among Italian women and 2.5 (95% CI, 1.07.0) among
Swedish women. The prevalence of the Arg/Arg genotype was
53% in Italian controls and 50% in Swedish controls, so that this
study is consistent with the majority of findings with respect to
controls. However, the prevalence of the Arg/Arg genotype
among case groups in this study (79% among the Italian case group and
73% among the Swedish group), was most similar to that found in the
initial study (76%). The prevalence of Arg/Arg among the
cases in the negative studies ranged from 40% (19)
to
68% (15)
. Therefore, the findings of an increased risk of
cervical cancer reported by Zehbe et al. (20)
and by Storey et al. (1)
may be attributable to
small, nonrepresentative groups of cases and controls. Further, both of
these studies used tumor tissue to examine the p53 Arg72Pro
polymorphism for the case group; therefore, their results may be
attributable to somatic changes in tumor tissue.
Unlike some of the previous studies (1
, 7
, 10
, 13
, 19
, 20) that relied on tumor tissue from the invasive cervical cancer cases as
a source of DNA for genotyping, we used peripheral leukocytes for both
case and control subjects as the DNA source. Therefore, our results can
be attributed neither to somatic changes in tumor tissue nor to PCR
artifacts from differential amplification of the longer proline allele
from formalin-fixed tissue. This strengthens the validity of our
conclusion that the p53 Arg72Pro polymorphism is not associated with
the risk of cervical carcinoma in our population.
Our data suggest that the Arg/Arg polymorphism may be related to
antibody response to the HPV-16 L1 protein among cervical cancer
patients. Although not quite statistically significant, this difference
in seroprevalence could suggest that the Arg/Arg genotype
might affect the ability of the host to clear an infection with HPV-16.
This finding needs to be confirmed by other epidemiological studies in
well-defined populations among different racial and ethnic groups. It
is unclear what the mechanism might be, although in our study and other
studies, a higher seroprevalence of HPV-16 L1 has been reported in
women with cancer compared with controls (21)
. Overall,
however, our data and those of others (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
do not
support the hypothesis that the p53 Arg72Pro polymorphism modifies the
risk of cervical cancer.
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Acknowledgments
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We thank Mary Anne Rossing and Peggy Porter for discussions on
this topic, and Elizabeth Tickman and Dawn Fitzgibbons for study
management help. Thanks also to Jenn I. Koop for laboratory assistance.
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Footnotes
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The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
1 Supported by National Cancer Institute Grant 3
PO1 CA 42792 and by the Cancer Surveillance System of the Fred
Hutchinson Cancer Research Center, which is funded by Contract No.
NO1-CN-05230 from the Surveillance, Epidemiology and End Results (SEER)
Program of the National Cancer Institute with additional support from
the Fred Hutchinson Cancer Research Center. 
2 To whom requests for reprints should be
addressed, at Division of Public Health Sciences, Fred Hutchinson
Cancer Research Center, 1100 Fairview Ave. N. (MP-381), P.O. Box 19024,
Seattle, WA 98109-1024. 
3 The abbreviations used are: HPV, human
papillomavirus; SEER, Surveillance, Epidemiology and End Results
(Program); OR, odds ratio; CI, confidence interval. 
Received 3/29/99;
revised 10/28/99;
accepted 11/30/99.
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