
Clinical Cancer Research Vol. 6, 1175-1179, March 2000
© 2000 American Association for Cancer Research
Molecular Oncology, Markers, Clinical Correlates |
Clinical Significance of Serum Soluble Intercellular Adhesion Molecule 1 in Gastric Cancer
Bunzo Nakata1,
Takeshi Hori,
Takeshi Sunami,
Yoshinari Ogawa,
Masakazu Yashiro,
Kiyoshi Maeda,
Tetsuji Sawada,
Yasuyuki Kato,
Tetsuro Ishikawa and
Kosei Hirakawa
First Department of Surgery [B. N., T. H., T. Su., Y. O., M. Y., K. M., T. Sa., T. I., K. H.] and Department of Oncology, Institute of Geriatrics and Medical Science [Y. K.], Osaka City University Medical School, Osaka 545-8585, Japan
 |
ABSTRACT
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We studied the
correlation between serum soluble intercellular molecule 1 (sICAM-1)
and clinicopathological features in patients with gastric cancer. The
impact of sICAM-1 on prognosis was also evaluated. The sera from
224 patients with gastric cancer, 44 healthy individuals, and 35
patients with benign gastrointestinal diseases (4 patients with
submucosal stomach tumors, 6 patients with gastric ulcers, 1 patient
with Crohn disease, 2 patients with ulcerative colitis, 7 patients with
gall stones, 5 patients with chronic pancreatitis, and 10 patients with
liver cirrhosis) were measured for sICAM-1 titer using a sandwich
enzyme immunoassay method. There was no correlation between the serum
titer of sICAM-1 and the age or gender of healthy controls. Among
patients with benign gastrointestinal diseases, the patients
with liver cirrhosis had a significantly higher mean serum sICAM-1
titer than that of healthy controls (P < 0.0001). The
mean serum sICAM-1 titer of all patients with gastric cancer was not
significantly different from that of healthy controls. However, among
the patients with stage IV and recurrent disease, the serum sICAM-1
titer of those with hematogenous metastasis was significantly higher
than that of patients without hematogenous metastasis
(P = 0.001). The patients with a high serum sICAM-1
titer of more than 304 ng/ml (mean of healthy controls plus SD) showed
a significantly worse prognosis than patients with a low serum sICAM-1
titer (P = 0.010). Nevertheless, serum sICAM-1 titer
was not an independent predictor of prognosis by multivariate analysis.
In conclusion, serum sICAM-1 cannot be used as a tumor marker for early
diagnosis. However, sICAM-1 in sera may still be worthwhile to measure
for monitoring hematogenous metastasis.
 |
INTRODUCTION
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ICAM-1,2
a member of the
immunoglobulin superfamily, is a Mr
70,000110,000 type I transmembrane glycoprotein with five
immunoglobulin-like extracellular domains (1)
. ICAM-1 is a
ligand for the ß2 integrin LFA-1 (2)
. It has been
reported that high expression of ICAM-1 on a tumor cells surface
increases the susceptibility of such tumor cells to
lymphocyte-mediated tumor cytotoxicity through the ICAM-1/LFA-1 system
(3
, 4)
.
Although the source of sICAM-1 has not been fully elucidated, it can be
released by cancer cells (4
, 5)
as well as by peripheral
blood mononuclear cells, endothelial cells, and fibroblastic cells
(6)
. Proteolytic cleavage of membrane-bound ICAM-1 may be
the most likely mechanism for the generation of sICAM-1
(7)
. Another feasible mechanism for sICAM-1 production
could be alternative splicing of ICAM-1 mRNA lacking the intramembrane
and intracellular domains. However, the corresponding spliced mRNA has
not been identified (7)
. It has been reported that in
patients with ICAM-1-negative cancer, a high level of sICAM-1 may be
shed from endothelial cells stimulated by interleukin 1
(8)
.
It is possible for sICAM-1 to bind to the LFA-1 molecules of leukocytes
and inhibit the binding of cell surface ICAM-1 on cancer cells
with leukocytes (9
, 10)
. Thus, production of sICAM-1
has been thought to play a role in avoiding ICAM-1/LFA-1-mediated tumor
cell cytotoxicity. In the present study, we analyzed the sera from 224
patients with gastric cancer to clarify the clinical significance of
serum sICAM-1 levels in this disease.
 |
PATIENTS AND METHODS
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Patients.
The subjects chosen for this study were 224 patients with
histologically confirmed gastric cancer who were admitted to the First
Department of Surgery, Osaka City University Hospital (Osaka, Japan).
Serum from each of these patients was obtained on admission. The serum
samples were stored at -20°C until assayed. A total of 217 patients
had primary disease, and 7 patients had recurrent cancer. The mean
age ± SD of patients was 60.3 ± 11.8 years (range, 3189
years). There were 157 males and 67 females. Patients who had other
carcinomas besides gastric cancers were omitted from the study. Gastric
cancer patients with inflammatory disease, autoimmune disease, or liver
dysfunction were also excluded from this study because it has been
reported that serum sICAM-1 levels are elevated in these diseases
(11, 12, 13)
. Throughout this report, the Japanese
Classification of Gastric Carcinoma (14)
was used for the
pathological diagnosis and classification of variables. The
histological type was divided into two groups: (a) the
differentiated type (well-differentiated and moderately differentiated
tubular adenocarcinoma and papillary adenocarcinoma); and
(b) the undifferentiated type (poorly differentiated
adenocarcinoma, signet-ring cell carcinoma, and mucinous
adenocarcinoma). The survival period was defined as the interval
between the time point at which the serum sample was obtained and May
31, 1999 for all living patients or until the day of death. Serum
samples from 44 healthy individuals (controls) and 35 patients without
gastric cancer but with benign gastrointestinal diseases (4 patients
with submucosal stomach tumors, 6 patients with gastric ulcers, 1
patient with Crohn disease, 2 patients with ulcerative colitis, 7
patients with gall stones, 5 patients with chronic pancreatitis, and 10
patients with liver cirrhosis) were also measured.
Assay.
The sera were assayed for sICAM-1 with a quantitative sandwich enzyme
immunoassay using Parameter Human sICAM-1 immunoassay kits (R&D
Systems, Inc., Minneapolis, MN) according to the manufacturers
instructions. The antibodies in the kit were raised against recombinant
sICAM-1 and are used to quantitate recombinant and natural human
sICAM-1 accurately. No cross-reactivity was found with human IgG,
soluble vascular cell adhesion molecule 1, or soluble E-selectin.
In brief, 100 µl of appropriately diluted antibody to recombinant
human sICAM-1 conjugated to horseradish peroxidase and 100 µl of a
1:21-diluted serum sample or the known concentration sICAM-1 control
were pipetted into the wells of a microplate that had been precoated
with a murine monoclonal antibody specific for human sICAM-1. After
mixing, the plate was covered with plate sealer and incubated at room
temperature for 1.5 h. Each well was aspirated and washed
thoroughly six times with a buffer; 100 µl of substrate
(tetramethylbenzidine) were added for color development. The mixture
was incubated at room temperature for 30 min. The color reaction was
terminated by the addition of 100 µl of stop solution (acid
solution). The optical density of each well was determined with an E
max microplate reader (Molecular Devices Co., Sunnyvale, CA) set to 450
nm; wave correction was set to 630 nm. Each sample and the sICAM-1
control were examined twice. The concentration of each serum sample was
determined by calculating the concentration of sICAM-1 corresponding to
the mean absorbance from the standard curve using the sICAM-1 control.
Statistical Analysis.
The correlation between the sICAM-1 titer and age was
assessed by linear regression using the least-squares method. We used
the unpaired t test to compare the sICAM-1 titer between the
two groups. The
2
test was used to compare the
prevalence or distribution of two variables. The relationship between
the sICAM-1 titer and survival was examined by constructing
Kaplan-Meier survival curves and by analyzing the differences using the
log-rank test. The Cox proportional hazards model was used for the
multivariate analysis of survival. Ps less than 0.05 were
considered to be statistically significant.
 |
RESULTS
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Serum sICAM-1 Titer in Healthy Controls.
The mean ± SD of the serum sICAM-1 titer in 44 healthy controls
was 231 ± 73 ng/ml. There was no correlation between serum
sICAM-1 titer and age as examined by linear regression analysis
(r = 0.123; P = 0.425). No significant
difference was observed in serum sICAM-1 titer between 23 healthy males
and 21 healthy females (mean ± SD, 236 ± 71
versus 226 ± 76 ng/ml; P = 0.627).
Serum sICAM-1 Titer in Patients with Benign Gastrointestinal
Diseases.
The serum sICAM-1 levels of patients with benign gastric disease,
inflammatory bowel disease, gall stones, or chronic pancreatitis were
not significantly different than those of healthy controls. However,
patients with liver cirrhosis had significantly higher serum sICAM-1
titers than healthy individuals (P < 0.0001; Fig. 1
).

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Fig. 1. The distribution of serum sICAM-1 titer in
healthy control subjects and in each patient with benign
gastrointestinal disease. Patients with liver cirrhosis alone had a
significantly higher serum sICAM-1 titer than healthy individuals
(P < 0.0001).
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Serum sICAM-1 Titer in Patients with Gastric Cancer.
There was no statistically significant difference between serum sICAM-1
titers in patients with gastric cancer (mean ± SD, 222 ±
119 ng/ml) and in healthy controls (P = 0.637).
However, some patients with advanced gastric cancer showed very high
serum sICAM-1 titers (Fig. 2)
. The two
patients with stage IV disease who had extremely elevated levels of
serum sICAM-1 (997 and 994 ng/ml) had hematogenous metastases.
These patients died from cachexia very shortly after admission; the
patient with bone metastasis had a survival of 1.5 months, and the
other patient with multiple liver metastases had a survival of 2.5
months. Patients with stage IV and recurrent disease were divided into
two groups according to the status of hematogenous metastasis; this
included metastases to the liver, bone, and skin. The serum sICAM-1
titers of those with hematogenous metastasis were significantly higher
than the titers of those without hematogenous metastasis (mean ±
SD, 414 ± 256 versus 222 ± 81 ng/ml;
P = 0.001; Fig. 3
).

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Fig. 2. The distribution of serum sICAM-1 titer in each
stage of gastric cancer (stage IIV), as defined by the Japanese
Classification of Gastric Carcinoma, and in recurrent disease
(R). The numbers in parentheses refer to the number of cases
examined. Some advanced cases had very high serum sICAM-1 titers,
although there was no significant difference between the titers of all
patients with gastric cancer and healthy individuals.
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The correlations between serum sICAM-1 titers and clinicopathological
features are given in Table 1
.
Information about the histological type of all specimens was available
because all 224 patients underwent endoscopic biopsy or surgery.
Peritoneal or hepatic metastasis status was determined by imaging study
and/or intraoperative findings. A total of 203 patients had serosal
invasion, as determined by intraoperative findings and/or histological
examination. A total of 192 patients were diagnosed by histological
examination with lymph node metastasis, and 188 patients were diagnosed
with lymphatic and venous invasion by histology. There was no
significant difference between the serum sICAM-1 titer of those with
differentiated cancers and those with undifferentiated cancers or
between those with and without peritoneal metastasis, serosal invasion,
or venous invasion. There were significant differences in the serum
sICAM-1 titers between those with and without hepatic metastasis
(P < 0.0001), lymph node metastasis (P = 0.003), and lymphatic invasion (P = 0.049).
Impact of Serum sICAM-1 Titer on Survival in Gastric Cancer.
All patients with gastric cancer were divided into high and low titer
groups using a reference serum value of a sICAM-1 concentration of 304
ng/ml, which was the mean of 44 healthy controls plus SD. The high
titer group consisted of 39 patients, and the low titer sICAM-1 group
consisted of 185 patients. The high titer group had a significantly
poorer prognosis than the low titer group (P = 0.010;
Fig. 4
).

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Fig. 4. Probability of survival for all gastric cancer
patients studied in relation to their serum sICAM-1 titers. The
reference value between high and low serum sICAM-1 concentration was
defined as 304 ng/ml, which represents the mean plus 1 SD of the serum
sICAM-1 concentration observed in healthy control subjects. The
survival rate of the high titer sICAM-1 group was significantly poorer
than that of the low titer sICAM-1 group.
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Histological type; peritoneal, hepatic, and lymph node metastasis;
serosal invasion; lymphatic and venous invasion; and serum sICAM-1
levels were analyzed by the Cox proportional hazards model.
Nevertheless, sICAM-1 was not an independent prognostic factor (hazard
ratio, 2.119; 95% confidence interval, 0.6846.564; P = 0.193).
 |
DISCUSSION
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In patients with certain malignancies, the serum sICAM-1 titers
have been found to be elevated in association with tumor growth and
distant metastasis of malignant melanoma (15)
, lung cancer
(16)
, breast cancer (17)
, hepatocellular
cancer (11)
, and colorectal cancer (18)
. Poor
survival of cancer patients correlated with a high level of serum
sICAM-1 has also demonstrated (15
, 17)
.
Several studies have emerged describing serum sICAM-1 in patients with
gastric cancer. Benekli et al. (19)
reported
that serum sICAM-1 levels were significantly increased in 27 patients
with gastric cancer compared to 18 healthy controls. Furthermore,
sICAM-1 levels had no significant impact on survival, according to
univariate analysis. Patients examined in the Benekli et al.
study (19)
had, for the most part, very advanced gastric
cancer: 21 patients had stage IV cancer; and 19 patients had distant
metastases. Kaihara et al. (9)
showed that the
serum level of sICAM-1 was significantly elevated in 30 patients with
early gastric cancer and 30 patients with advanced disease was compared
to 11 healthy controls. Velikova et al. (20)
reported that serum sICAM-1 levels were significantly elevated in both
15 patients with stage I/II disease and 30 patients with stage III/IV
disease as compared with 52 healthy subjects. However, Velikova
et al. (20)
found no statistically significant
difference between the survival periods with high and low
sICAM-1 levels when they used a cut-off value of the 95th percentile in
healthy controls. Yoo et al. (21)
studied sera
from 142 patients with gastric cancer. With regard to inoperable
cancer, the sICAM-1 level of 12 patients with liver metastasis was
significantly greater than that of 35 patients without liver
metastasis. Synchronous sICAM-1 and soluble vascular cell adhesion
molecule 1 was an independent risk factor in gastric cancer patients of
the Yoo et al. study (21)
. These previous
investigations of serum sICAM-1 levels in gastric cancer consisted of
small numbers of patients, and the majority of the patients had
advanced disease. Therefore, the association between serum sICAM-1
levels and clinicopathological factors has not been fully elucidated.
We studied the serum sICAM-1 titer of 224 patients with gastric cancer,
including 122 stage I cases, and examined details of clinical
significance regarding this molecule in the sera. Contrary to previous
reports, there was no elevation of serum sICAM-1 titer in patients with
gastric cancer in comparison with healthy controls. The discrepancy
between the present results and previous reports may be caused
by a substantial difference in the number of patients with early-stage
disease. In our study, some patients with advanced gastric cancer had
higher serum sICAM-1 titers. We also investigated the possible
influences of hematogenous status on the elevation of serum sICAM-1
levels in patients with stage IV and recurrent disease. Among patients
with these very advanced diseases, patients with hematogenous
metastasis had higher serum sICAM-1 titers than those without
hematogenous metastasis. In all patients studied, we found no
significant influences on serum sICAM-1 titer according to histological
type, peritoneal metastasis status, or serosal invasion status.
However, metastatis in the liver or lymph nodes was associated
with a rise in the serum sICAM-1 level. These results suggest that an
increase in the bulk of a metastatic tumor might raise the sICAM-1
serum level because peritoneal metastasis usually does not create large
tumors, whereas hepatic and lymph node metastasis do create large
tumors in some cases.
The mechanism by which human cells generate sICAM-1 is not known.
However, it has been demonstrated that sICAM-1 may be produced by the
proteolytic cleavage of membrane-associated ICAM-1; whereas it may lack
the intracellular and transmembrane region required for cell anchorage,
sICAM-1 may possess most of the necessary extracellular structure to
retain the functional activities of ICAM-1 (4
, 7)
.
It has been reported that ICAM-1 on the surface of cancer cells or
antigen-presenting cells (i.e., macrophages) is a
costimulatory factor that stabilizes T-cell receptor-mediated binding
between these cells and T lymphocytes (22)
. sICAM-1 would
work as a immunosuppressive agent by blocking LFA-1 on T lymphocytes,
thus rendering it less available for binding with cell surface ICAM-1
on cancer cells (10)
. In this manner, the shedding of
sICAM-1 may enhance the metastatic process by escaping host immune
surveillance. This therefore presents an additional potential mechanism
for high serum levels of sICAM-1 in patients with gastric cancer that
had metastasized via hematogenous and lymphatic routes.
In conclusion, there was a modest association between serum sICAM-1
titer and cancer staging. The serum sICAM-1 level cannot be considered
as an independent prognostic factor in patients with gastric cancer,
although it can be a prognostic predictor by univariate analysis.
Together with these results, serum sICAM-1 has limited clinical utility
as a tumor marker; however, it may be useful for monitoring
hematogenous metastasis. Measuring the serum sICAM-1 level might let us
learn how sICAM-1 helps cancer cells evade immune surveillance.
 |
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 To whom requests for reprints should be
addressed, at First Department of Surgery, Osaka City University
Medical School, 1-4-3 Asahimachi, Abeno-ku, Osaka 545-8585, Japan.
Phone: 6-6645-3838; Fax: 6-6646-6450; E-mail
bunzo@med.osaka-cu.ac.jp. 
2 The abbreviations used are: ICAM-1,
intercellular adhesion molecule 1; sICAM-1, soluble ICAM-1; LFA-1,
leukocyte function antigen 1. 
Received 8/ 5/99;
revised 10/21/99;
accepted 11/26/99.
 |
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