The alterations of cytokeratin and vimentin protein expressions in primary esophageal spindle cell carcinoma
verfasst von:
Xin Min Li, Xin Song, Xue Ke Zhao, Shou Jia Hu, Rang Cheng, Shuang Lv, Dan Feng Du, Xiang Yang Zhang, Jian Liang Lu, Jian Wei Ku, Dong Yun Zhang, Yao Zhang, Zong Min Fan, Li Dong Wang
The accumulated evidence has indicated the diagnostic role of cytokeratin (CK) and vimentin protein immunoassay in primary esophageal spindle cell carcinoma (PESC), which is a rare malignant tumor with epithelial and spindle components. However, it is largely unknown for the expression of CK and vimentin in pathological changes and prognosis of PESC.
Methods
Eighty-two PESC patients were identified from the esophageal and gastric cardia cancer database established by Henan Key Laboratory for Esophageal Cancer Research of Zhengzhou University. We retrospectively evaluated CK and vimentin protein expressions in PESC. Clinicopathological features were examined by means of univariate and multivariate survival analyses. Furthermore, the co-expression value of cytokeratin and vimentin was analyzed by receiver operating characteristic (ROC) curve.
Results
The positive pan-cytokeratins AE1/AE3 (AE1/AE3 for short) staining was chiefly observed in cytoplasm of epithelial component tumor cells, with a positive detection rate of 85.4% (70/82). Interestingly, 19 cases showed AE1/AE3 positive staining both in epithelial and spindle components (23.2%). However, AE1/AE3 expression was not observed with any significant association with age, gender, tumor location, gross appearance, lymph node metastasis and TNM stage. Furthermore, AE1/AE3 protein expression does not show any effect on survival. Similar results were observed for vimentin immunoassay. However, in comparison with a single protein, the predictive power of AE1/AE3 and vimentin proteins signature was increased apparently than with single signature [0.75 (95% CI = 0.68–0.82) with single protein v.s. 0.89 (95% CI = 0.85–0.94) with AE1/AE3 and vimentin proteins]. The 1-, 3-, 5- and 7-year survival rates for PESC patients in this study were 79.3%, 46.3%, 28.0% and 15.9%, respectively. Multivariate analysis demonstrated age and TNM stage were independent prognostic factors for overall survival (P = 0.036 and 0.003, respectively). It is noteworthy that only 17.1% patients had a PESC accurate diagnosis by biopsy pathology before surgery (14/82). 72.4% PESC patients with biopsy pathology before surgery had been diagnosed as squamous cell carcinoma.
Conclusion
The present study demonstrates that cytokeratin and vimentin protein immunoassay is a useful biomarker for PESC accurate diagnosis, but not prognosis. The co-expression of cytokeratin and vimentin in both epithelial and spindle components suggest the possibility of single clone origination for PESC.
Abkürzungen
AUC
Area under the curve
CI
Confidence interval
CK
Cytokeratin
DAB
Diaminobenzidine
HR
Hazard ratio
PESC
Primary esophageal spindle cell carcinoma
ROC
Receiver operating characteristic
Background
The primary esophageal spindle cell carcinoma (PESC), which has also been referred to as carcinosarcoma, sarcomatoid carcinoma, pseudosarcoma, pseudosarcomatous carcinoma, or polypoid carcinoma in literature, has been classified as a subtype of esophageal squamous cell carcinoma by WHO in 2010 [1]. Histopathologically, PESC is characterized by mixed two components, i.e., epithelial and spindle. Although the histogenesis of these two different components remains largely unknown, the accumulated evidence from many case reports has indicated the differential role of cytokeratin (CK) and vimentin protein immunoassay in PESC diagnosis [2‐5]. However, it has not been well characterized in terms of immunohistochemical features for CK and vimentin in PESC accurate diagnosis and prognosis prediction.
In the present study, we retrospectively analyzed the CK and vimentin immunoreactivity and their possible roles in accurate diagnosis and prognosis on 82 cases with PSEC, which were retrieved from our esophageal cancer database from 1973 to 2015.
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Methods
Patients
The two hundreds and eighty-six PESC patients were identified from the esophageal and gastric cardia cancer database (with a total of 500,000 patients) established by Henan Key Laboratory for Esophageal Cancer Research, the First Affiliated Hospital of Zhengzhou University from 1973 to 2015 [6]. Based on the criteria of more than 5 year follow-up after surgical treatment and detailed clinicohistopathological findings, eighty-two PSEC patients were finally enrolled in this study, including 57 males with a mean age of 61.8 ± 8.8 years and 25 females with a mean age of 64.1 ± 6.6 years. All the PESC patients were performed surgical treatment and did not receive any radio- or chemo-therapy before surgery. The clinicopathological characteristics of the 82 patients were summarized in Table 1. The gross appearance of PESC was classified into three types, i.e., polypoid, ulcerative and infiltrating [7]. Overall survival (OS) time was calculated from the day of esophagectomy to death or to the last follow-up. The median follow-up of the entire cohort was 50.1 months (range, 4.1–123.5 months). The success follow-up rate was 94.2%. Informed consent was obtained from all these patients before taking part in our study. This study was approved by the Ethical Committee of Zhengzhou University (No.16047).
Table 1
Clinical characteristics of 82 PESC patients n (%)
No. of case of examination (%)
Age
< 60 years
26 (31.7)
≥ 60 years
56 (68.3)
Gender
Male
57 (69.5)
Female
25 (30.5)
Family history
Positive
18 (22.0)
Negative
64 (78.0)
Smoking
Yes
41 (50.0)
No
41 (50.0)
Alcohol
Yes
36 (43.9)
No
46 (56.1)
Tumor location
Uppera
3 (3.7)
Middle
54 (65.9)
Lower
25 (30.4)
Gross appearance
Polypoid
69 (84.1)
Ulcerative
8 (9.8)
Infiltrating
5 (6.1)
Lymph node metastasis
Yes
23 (28.0)
No
59 (72.0)
TNM stage
I
29 (35.4)
II
37 (45.1)
III
16 (19.5)
IV
0 (0.0)
aThere was one patient whose tumor location was in cervical segment
Surgical specimen preparation and immunohistochemistry
The entire surgical specimen was routinely formalin-fixed, paraffin-embedded and H&E stained for histopathological diagnosis and immunohistochenistry assay. The immunoreactivty for pan-cytokeratins AE1/AE3 (AE1/AE3 for short) and CK5/6, chiefly in epithelial component and vimentin, chiefly in spindle component, was determined in this study. The AE3 monoclonal antibody recognizes the 65 to 67 triplet, 64, 59, 58, 56, 54 and 52kD proteins also known as cytokeratin 1, 2, 3, 4, 5, 6, 7, and 8 while the AE1 antibody recognizes 56.5, 54, 50, 50, 48, and 40 kDa proteins (also known as CK10, 14, 15, 16 and 19). The AE1/AE3, CK5/6 and vimentin antibodies were all monoclonal mouse antibodies (1:100 dilutions, Gene Tech, USA). Immunohistochemistry was carried out by a two-step protocol (Benchmark XT, Roche). In brief, the 5 μm paraffin-embedded tissue sections were deparaffinized, rehydrated and immersed in 3% hydrogen peroxide solution for 10 min, heated in citrate buffer (pH 6.0) for 25 min at 95 °C, and cooled for 60 min at room temperature. Between each incubation step, the slides were washed with phosphate buffered saline (PBS, pH 7.4). Immunostaining was performed using Roche Benchmark XT with diaminobenzidine (DAB) according to manufacturer recommendations (Gene Tech) and subsequently counterstained with hematoxylin. Slides without the addition of primary antibody served as negative control.
Assessment of immunohistochemical results
Tissue sections were independently and blindly assessed by three independent histopathologists (XM Li, DY Zhang, and Y Zhang). Discrepancies were resolved by consensus. Positive reactions were defined as those showing brown signals in the cell cytoplasm.
Statistical analysis
Statistical analysis was performed using SPSS 16.0 software (SPSS Corp, Chicago, IL, USA). Data was represented as the mean ± standard deviation for continuous variables or number (%) for categorical data. Spearman’s two-sided rank correlation and Fisher’s exact test were used to explore the correlation levels between protein expression and clinical characteristics. To estimate the association between eligible variables and survival time, Kaplan-Meier analysis and log-rank tests were used. Univariate and multivariate analyses were based on the cox proportional hazards regression model. Receiver operating characteristic (ROC) curve analysis was used to determine the predictive value of AE1/AE3 and vimentin proteins expression, and the differences in the area under the curve (AUC) were detected by SPSS 16.0. P value less than 0.05 was considered statistically significant.
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Results
AE1/AE3 expression and clinicopathological features
Histologically, PESC involve both epithelial and spindle components (Fig. 1). The positive AE1/AE3 staining was chiefly observed in cytoplasm of epithelial tumor cells (Fig. 2), with a positive detection rate of 85.4% (70/82). Interestingly, in 19 cases, AE1/AE3 positive staining was also observed in spindle tumor cells (19/82, 23.2%). However, AE1/AE3 expression was not observed with any significant association with age, gender, family history, smoking, alcohol, tumor location, gross appearance, lymph node metastasis and TNM stage (P = 0.070, 0.914, 0.919, 0.755, 0.654, 0.580, 0.660, 0.547, and 0.121, respectively, Table 2). Similarly, considering the AE1/AE3 expression in different components of PESC separately, AE1/AE3 expression showed no correlation with age, gender, family history, smoking, alcohol, tumor location, gross appearance, lymph node metastasis, and TNM stage (P = 0.888, 1.000, 0.118, 0.978, 0.764, 0.126, 0.794, 0.449, and 0.146, respectively, Table 3).
Fig. 1
Histological examination (100×) revealed two tumor components
Fig. 2
The protein expressions of AE1/AE3 in PESC tissues by immunohistochemistry (100×). The positive immunostaining of AE1/AE3 was localized in cell cytoplasm of epithelial component
Table 2
The expression rate of AE1/AE3 protein in PESC
Number
Expression rate of AE1/AE3 protein (%)
χ2
P
Positive(n = 70)
Negative(n = 12)
Age
< 60 years
26
19 (73.1)
7 (26.9)
3.28
0.070
≥ 60 years
56
51 (91.1)
5 (8.9)
Gender
Male
57
48 (84.2)
9 (15.8)
0.01
0.914
Female
25
22 (88.0)
3 (12.0)
Family history
Positive
18
16 (88.9)
2 (11.1)
0.01
0.919
Negative
64
54 (84.3)
10 (15.7)
Smoking
Yes
41
34 (82.9)
7 (17.1)
0.10
0.755
No
41
36 (87.8)
5 (12.2)
Alcohol
Yes
36
30 (83.3)
6 (16.7)
0.21
0.654
No
46
40 (87.0)
6 (13.0)
Tumor location
Upper
3
2 (66.7)
1 (33.3)
1.48
0.580
Middle
54
46 (85.2)
8 (14.8)
Lower
25
22 (88.0)
3 (12.0)
Gross appearance
Polypoid
69
59 (85.5)
10 (14.5)
1.30
0.660
Ulcerative
8
6 (75.0)
2 (25.0)
Infiltrating
5
5 (100.0)
0 (0.0)
Lymph node metastasis
Yes
23
21 (91.3)
2 (8.7)
0.36
0.547
No
59
49 (83.1)
10 (16.9)
TNM stage
I
29
27 (93.1)
2 (6.9)
4.40
0.121
II
37
28 (75.7)
9 (24.3)
III
16
15 (93.8)
1 (6.2)
IV
0
0 (0.0)
0 (0.0)
Table 3
The expression of AE1/AE3 protein in different components of PESC
Number
Expression rate of AE1/AE3 protein (%)
Positive in epithelial component (%)
Positive in spindle component (%)
Positive in both of epithelial and spindle components (%)
χ2
P
Age
< 60 years
26
19 (73.1)
19 (73.1)
6 (23.1)
6 (23.1)
0.24
0.888
≥ 60 years
56
51 (91.1)
51 (91.1)
13 (23.2)
13 (23.2)
Gender
Male
57
48 (84.2)
48 (84.2)
13 (22.8)
13 (22.8)
0.00
1.000
Female
25
22 (88.0)
22 (88.0)
6 (24.0)
6 (24.0)
Family history
Positive
18
16 (88.9)
16 (88.9)
1 (5.6)
1 (5.6)
5.777
0.118
Negative
64
54 (84.3)
54 (84.3)
18 (28.1)
18 (28.1)
Smoking
Yes
41
34 (82.9)
34 (82.9)
10 (24.4)
10 (24.4)
0.197
0.978
No
41
36 (87.8)
36 (87.8)
9 (22.0)
9 (22.0)
Alcohol
Yes
36
30 (83.3)
30 (83.3)
10 (27.8)
10 (27.8)
1.154
0.764
No
46
40 (87.0)
40 (87.0)
9 (19.6)
9 (19.6)
Tumor location
Upper
3
2 (66.7)
2 (66.7)
1 (33.3)
1 (33.3)
6.42
0.126
Middle
54
46 (85.2)
46 (85.2)
16 (29.6)
16 (29.6)
Lower
25
22 (88.0)
22 (88.0)
2 (8.0)
2 (8.0)
Gross appearance
Polypoid
69
59 (85.5)
59 (85.5)
15 (21.7)
15 (21.7)
3.22
0.794
Ulcerative
8
6 (75.0)
6 (75.0)
1 (12.5)
1 (12.5)
Infiltrating
5
5 (100.0)
5 (100.0)
3 (60.0)
3 (60.0)
Lymph node metastasis
Yes
23
21 (91.3)
21 (91.3)
8 (34.8)
8 (34.8)
1.60
0.449
No
59
49 (83.1)
49 (83.1)
11 (18.6)
11 (18.6)
TNM stage
I
29
27 (93.1)
27 (93.1)
3 (10.3)
3 (10.3)
6.71
0.146
II
37
28 (75.7)
28 (75.7)
9 (24.3)
9 (24.3)
III
16
15 (93.8)
15 (93.8)
7 (43.8)
7 (43.8)
IV
0
0 (0.0)
0 (0.0)
0 (0.0)
0 (0.0)
×
×
CK5/6 expression and clinicopathological features
The positive CK5/6 staining was chiefly observed in cytoplasm of epithelial tumor cells, with a positive detection rate of 76.8% (63/82). CK5/6 protein was obviously expressed in age upper 60 years (P = 0.005). However, CK5/6 expression was not observed with any significant association with gender, family history, smoking, alcohol, tumor location, gross appearance, lymph node metastasis and TNM stage (P = 0.652, 0.671, 0.432, 0.382, 0.267, 0.350, 0.629, and 0.056, respectively, Table 4).
Table 4
The expression rate of CK5/6 protein in PESC
Number
Expression rate of CK 5/6 protein (%)
χ2
P
Positive(n = 63)
Negative(n = 19)
Age
< 60 years
26
15 (57.7)
11 (42.3)
7.83
0.005
≥ 60 years
56
48 (85.7)
8 (14.3)
Gender
Male
57
43 (75.4)
14 (24.6)
0.20
0.652
Female
25
20 (80.0)
5 (20.0)
Family history
Positive
18
15 (83.3)
3 (16.7)
0.18
0.671
Negative
64
48 (75.0)
16 (25.0)
Smoking
Yes
41
30 (73.2)
11 (26.8)
0.62
0.432
No
41
33 (80.5)
8 (19.5)
Alcohol
Yes
36
26 (72.2)
10 (27.8)
0.77
0.382
No
46
37 (80.4)
9 (19.7)
Tumor location
Upper
3
2 (66.7)
1 (33.3)
2.87
0.267
Middle
54
39 (72.2)
15 (27.8)
Lower
25
22 (88.0)
3 (12.0)
Gross appearance
Polypoid
69
53 (76.8)
16 (23.2)
2.08
0.350
Ulcerative
8
5 (62.5)
3 (37.5)
Infiltrating
5
5 (100.0)
0 (0.0)
Lymph node metastasis
Yes
23
19 (82.6)
4 (17.4)
0.23
0.629
No
59
44 (74.6)
15 (25.4)
TNM stage
I
29
26 (89.7)
3 (10.3)
5.63
0.056
II
37
24 (64.9)
13 (35.1)
III
16
13 (81.3)
3 (18.7)
IV
0
0 (0.0)
0 (0.0)
Vimentin expression and clinicopathological features
Vimentin positive expression was chiefly observed in the cytoplasm of spindle tumor cells. In this study, all the 82 patients (82/82, 100.0%) with vimentin were positive staining (Fig. 3). In contrast, only 7 PESC patients showed positive vimentin expression in epithelial tumor components. Moreover, the vimentin expression in different components of PESC did not show any correlation with age, gender, family history, smoking, alcohol, tumor location, gross appearance, lymph node metastasis, and TNM stage (P = 1.000, 1.000, 0.309, 1.000, 0.282, 0.832, 0.188, 1.000, and 0.067, respectively, Table 5).
Fig. 3
The protein expressions of vimentin in PESC tissues by immunohistochemistry (100×). The positive immunostaining of vimentin was localized in cell cytoplasm of spindle component
Table 5
The expression of vimentin protein in different components of PESC
Number
Expression rate of vimentin protein (%)
Positive in epithelial component (%)
Positive in spindle component (%)
Positive in both of epithelial and spindle components (%)
χ2
P
Age
< 60 years
26
26 (100.0)
2 (7.7)
26 (100.0)
2 (7.7)
0.15
1.000
≥ 60 years
56
56 (100.0)
5 (8.9)
56 (100.0)
5 (8.9)
Gender
Male
57
57 (100.0)
5 (8.8)
57 (100.0)
5 (8.8)
0.15
1.000
Female
25
25 (100.0)
2 (8.0)
25 (100.0)
2 (8.0)
Family history
Positive
18
18 (100.0)
3 (16.7)
18 (100.0)
3 (16.7)
3.347
0.309
Negative
64
64 (100.0)
4 (6.3)
64 (100.0)
4 (6.3)
Smoking
Yes
41
41 (100.0)
4 (9.8)
41 (100.0)
4 (9.8)
0.379
1.000
No
41
41 (100.0)
3 (7.3)
41 (100.0)
3 (7.3)
Alcohol
Yes
36
36 (100.0)
5 (13.9)
36 (100.0)
5 (13.9)
3.782
0.282
No
46
46 (100.0)
2 (4.3)
46 (100.0)
2 (4.3)
Tumor location
Upper
3
3 (100.0)
0 (0.0)
3 (100.0)
0 (0.0)
1.57
0.832
Middle
54
54 (100.0)
4 (7.4)
54 (100.0)
4 (7.4)
Lower
25
25 (100.0)
3 (12.0)
25 (100.0)
3 (12.0)
Gross appearance
Polypoid
69
69 (100.0)
5 (7.2)
69 (100.0)
5 (7.2)
7.59
0.188
Ulcerative
8
8 (100.0)
0 (0.0)
8 (100.0)
0 (0.0)
Infiltrating
5
5 (100.0)
2 (40.0)
5 (100.0)
2 (40.0)
Lymph node metastasis
Yes
23
23 (100.0)
2 (8.7)
23 (100.0)
2 (8.7)
0.21
1.000
No
59
59 (100.0)
5 (8.5)
59 (100.0)
5 (8.5)
TNM stage
I
29
29 (100.0)
0 (0.0)
29 (100.0)
0 (0.0)
7.50
0.067
II
37
37 (100.0)
5 (13.5)
37 (100.0)
5 (13.5)
III
16
16 (100.0)
2 (12.5)
16 (100.0)
2 (12.5)
IV
0
0 (0.0)
0 (0.0)
0 (0.0)
0 (0.0)
×
Predictive diagnostic model
To determine the diagnosis value with these two immunohistocheminal proteins in PESC, the predictive diagnostic model was calculated as Y = (β1) × (AE1/AE3) + (β2) × (vimentin), with Y equal to risk score and βn equal to each protein’s coefficient value from univariate cox proportional hazards regression analysis [8]. The corresponding coefficients were as follows: β1 = 0.337 and β2 = 0.519. Patients were ranked and divided into positive and negative groups using the 50th percentile (i.e., median) risk score as the cut-off value. The area under the receiver operating characteristic (ROC) curve for AE1/AE3 protein was 0.75 (95% CI = 0.68–0.82) (Fig. 4 A). In comparison with a single protein, the predictive power of the AE1/AE3 and vimentin proteins signature was increased apparently than with single signature [0.75 (95% CI = 0.68–0.82) with single protein in Fig. 3 A v.s. 0.89 (95% CI = 0.85–0.94) with AE1/AE3 and vimentin proteins in Fig. 4 B].
Fig. 4
Predictive ability of diagnostic model. Predictive ability of diagnostic model compared with AE1/AE3 protein shown by receiver operating characteristic (ROC) curves (a) and area under the curve (AUC) in AE1/AE3 and vimentin proteins datasets (b)
×
CK protein expression and PESC survival
The median OS was 34.0 months (range, 2.9–121.3 months) (Fig. 5). The 1-, 3-, 5- and 7-year survival rates for PESC patients in this study were 79.3%, 46.3%, 28.0% and 15.9%, respectively. Kaplan-Meier analysis showed that age, gross appearance and TNM stage were the important factors to affect survival. The PESC patients with age under 60 years had a better survival than age upper 60 years (P = 0.036, Fig. 6 A). The survival in the infiltrating gross appearance was of the worst prognosis than other gross appearances (P = 0.001, Fig. 6 B). The TNM stage used for esophageal squamous cell carcinoma could make a clear different survival curve for stage I, II and III (P = 0.015, Fig. 6 C). Furthermore, multivariate analysis demonstrated that age and TNM stage were independent prognostic factors for overall survival (P = 0.036 and 0.003, respectively, Table 6). Surprisingly, the univariate analyses showed no difference for survival in the patients with and without lymph node metastasis (0.51 (95% CI = 0.23–1.08), P = 0.072, Fig. 6 D). And there was no significant difference among lymph node metastasis and 1-,3-, 5-, 7- and over 7-year survival (P = 0.129, Table 7). Similar results were observed in tumor location (P = 0.109), gender (P = 0.537), smoking (P = 0.348), alcohol (P = 0.850), and family history (P = 0.115).
Fig. 5
The curve for the whole cohort overall survival (OS)
Fig. 6
Kaplan-Meier analysis of overall survival for age (P = 0.036) (a), gross appearance (P = 0.001) (b), TNM stage (P = 0.015) (c) and lymph node metastasis (P = 0.072) (d) in the generation dataset of 82 cases
Table 6
Univariate and multivariate analysis of survival on clinicopathological factors
Number
Univariate analysis
Multivariate analysis
HR
95% CI
P
HR
95% CI
P
Age
< 60 years
26
2.52
(1.03–6.16)
0.036
2.66
(1.06–6.63)
0.036
≥ 60 years
56
Gender
Male
57
0.77
(0.34–1.75)
0.537
Female
25
Family history
Positive
18
0.40
(0.12–1.31)
0.115
Negative
64
Smoking
Yes
41
0.71
(0.35–1.46)
0.348
No
41
Alcohol
Yes
36
1.07
(0.53–2.18)
0.850
No
46
Tumor location
Upper
3
1.96
(0.96–4.01)
0.109
Middle
54
Lower
25
Gross appearance
Polypoid
69
1.58
(0.90–2.77)
0.001
1.38
(0.79–2.39)
0.256
Ulcerative
8
Infiltrating
5
Lymph node metastasis
Yes
23
0.51
(0.24–1.08)
0.072
No
59
TNM stage
I
29
1.95
(1.18–3.21)
0.015
2.11
(1.28–3.50)
0.003
II
37
III
16
IV
0
AE1/AE3 protein
Positive
70
1.10
(0.83–1.45)
0.527
Negative
12
CK5/6 protein
Positive
63
1.82
(0.70–4.73)
0.222
Negative
19
Abbreviations: CI confidence interval, HR hazard ratio
Table 7
Lymph node metastasis and survival
Survival (year)
Lymph node metastasis
χ2
P
Yes (n = 23)
No (n = 59)
1
16 (69.5)
49 (83.1)
6.697
0.129
3
6 (26.1)
30 (50.8)
5
2 (8.7)
17 (28.8)
7
0 (0.0)
12 (20.3)
Over 7
0 (0.0)
10 (16.9)
×
×
The univariate and multivariate analyses showed that AE1/AE3 and CK5/6 proteins expression were not related with PESC survival (Table 6).
Comparison on PESC diagnosis by biopsy with surgical resection specimen
In the present study, all the 82 patients were confirmed as PESC by surgical pathology. However, only 14 patients had a PESC diagnosis by biopsy pathology before surgery (14/82, 17.1%). Of the misdiagnosed patients with biopsy pathology, 72.4% had been diagnosed as squamous cell carcinoma followed by adenocarcinoma and others.
Clinicopathological features with different stage
In this study, most of PESC symptoms at presentation were dysphagia, (93.1% in stage I, 86.5% in stage II, and 93.8% in stage III), followed by odynophagia (6.9% in stage I, 5.4% in stage II and 6.2% in stage III), and no difference was observed for the early (stage I) and advanced (stage II and III) in symptom distribution (P = 0.594). Similarly, it did not show any correlation for the staging with age (P = 0.494), gender (P = 0.911), family history (P = 0.885), smoking (P = 0.768), alcohol (P = 0.242), tumor location (P = 0.960) and gross appearance (P = 0.221, Table 8).
Table 8
The clinicopathological features with different stage in PESC
Number
Stage (%)
χ2
P
I(n = 29)
II(n = 37)
III(n = 16)
Age
< 60 years
26
7 (26.9)
14 (53.8)
5 (19.3)
1.41
0.494
≥ 60 years
56
22 (39.3)
23 (41.1)
11 (19.6)
Gender
Male
57
21 (36.8)
25 (43.9)
11 (19.3)
0.19
0.911
Female
25
8 (32.0)
12 (48.0)
5 (20.0)
Family history
Positive
18
6 (33.3)
9 (50.0)
3 (16.7)
0.25
0.885
Negative
64
23 (35.9)
28 (43.8)
13 (20.3)
Smoking
Yes
41
15 (36.6)
17 (41.5)
9 (21.9)
0.53
0.768
No
41
14 (34.1)
20 (48.8)
7 (17.1)
Alcohol
Yes
36
11 (30.6)
15 (41.7)
10 (27.7)
2.84
0.242
No
46
18 (39.1)
22 (47.8)
6 (13.1)
Tumor location
Upper
3
1 (33.3)
2 (66.7)
0 (0.0)
1.17
0.960
Middle
54
19 (35.2)
23 (42.6)
12 (22.2)
Lower
25
9 (36.0)
12 (48.0)
4 (16.0)
Gross appearance
Polypoid
69
25 (36.2)
30 (43.5)
14 (20.3)
5.21
0.221
Ulcerative
8
4 (50.0)
4 (50.0)
0 (0.0)
Infiltrating
5
0 (0.0)
3 (60.0)
2 (40.0)
Lymph node metastasis
Yes
23
1 (4.3)
7 (30.4)
15 (65.3)
42.27
0.000
No
59
28 (47.5)
30 (50.8)
1 (1.7)
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Discussion
As we knew, this is the largest sample size report on cytokeratin and vimentin protein expression and PESC diagnosis and prognosis. The present results demonstrate that cytokertain, expressed chiefly in epithelial tumor cells, and vimentin, expressed always in spindle tumor cells, are useful biomarker in PESC diagnosis, especially, the predictive power of the AE1/AE3 and vimment proteins signature together was increased apparently than with single signature. However, the AE1/AE3, CK5/6 and vimment proteins expressions did not show any significant effects on PESC survival. Furthermore, no relationship was observed for the AE1/AE3 and vimment proteins expression and age, gender, tumor location, gross appearance, lymph node metastasis, and TNM stage. Similarly, the expression CK5/6 did not show relationship with gender, tumor location, gross appearance, lymph node metastasis, and TNM stage. The major genetic abnormalities for PESC remain largely unknown. Only few series genetic studies have been published with conflicting results regarding the type of alteration present in the two tumor components. The p53 protein over-expression and CD-1 gene amplification seem to occur frequently in both tumor components, in contrast, E-cadherin protein expression is observed chiefly in epithelial component [9, 10]. However, because of that most genetic studies involve single or small number of cases, the value of the observed genetic changes in PESC prognosis is not clear.
Interestingly, the present study demonstrates that 23.2% of PESC has a positive AE1/AE3 immunoreactivity in both epithelial and spindle tumor components. Similar results are observed in 8.5% of PESC for vimentin. These findings suggest that PESC may originate from same clone. The histogenesis for PSEC remains inconclusive. Further whole genomic sequencing pattern may shed light on the molecular clue for PESC histogenesis.
The present study demonstrates a slight better 5-year survival for PSEC than esophageal squamous cell carcinoma [11]. The gross appearance and TNM stage are independent prognostic factors for overall survival, and, in this study, the PESC patients with lymph node metastasis did not show worsen prognosis than those without lymph node metastasis. The reason is not clear. Lymph node metastasis has been well documented as risk factor for esophageal squamous cell carcinoma [12‐17]. It is noteworthy that the prevalence of lymph node metastasis in PESC is apparently lower than in esophageal squamous cell carcinoma, which may contribute to the better survival for PESC than the esophageal squamous cell carcinoma. Histopathologically, PESC is composed by epithelial and spindle components. In the present study, only 23 PSEC patients occurring lymph node metastasis, almost all the lymph node metastatic components are epithelial. Therefore, it is desirable to characterize the PESC lymph node metastasis by different components to correlate with survival in large cohort study.
It is noteworthy that the biopsy accurate diagnosis for PESC before radical esophagectomy is much lower than the surgical diagnosis. 72% of PESC had been diagnosed as squamous cell carcinoma. Obviously, the too small size is the major reason for this poor biopsy accurate diagnosis. Another reason is because of the predominant epithelial component in these PESC patients. Fortunately, this partial diagnosis has no impact on therapy for the moment [9].
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Conclusions
In summary, the present study demonstrates that cytokeratin and vimentin protein immunoassay is a useful biomarker for PESC accurate diagnosis, but not prognosis. The co-expression of cytokeratin and vimentin in both epithelial and spindle components suggest the possibility of single clone origination for PESC. PESC occurs predominantly in male patient (male:female, 2.3:1) with a peak age of 60 years old. PESC are located more frequently in the middle segment. The age and TNM stage of PESC are independent prognostic factors.
Acknowledgements
We thank all the patients and their family members whose contributions made this work possible. We thank P Zhang and XC Jia for their help in survival statistics.
Funding
This work was supported by the National High-Tech Research and Development Program of China (SQ2015AA0202183 to LD Wang), and the National Natural Science Foundation of China (U1301227 to LD Wang). The funding body had no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript.
Availability of data and materials
The datasets generated during and analysed during the current study are available from the corresponding author on reasonable request.
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Ethics approval and consent to participate
Since the tissues used in this study are from patients diagnosed between 1973 and 2015 not from all patients a written informed consent is available. But in accordance with the Chinese law, the study was reviewed and approved by the Ethics committee of Zhengzhou University (No.16047) and it was conducted in accordance with the Declaration of Helsinki. All samples were anonymized before analysis was performed, to guarantee the protection of privacy.
Consent for publication
Not applicable.
Competing interests
The authors declare that they have no competing interests.
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The alterations of cytokeratin and vimentin protein expressions in primary esophageal spindle cell carcinoma
verfasst von
Xin Min Li Xin Song Xue Ke Zhao Shou Jia Hu Rang Cheng Shuang Lv Dan Feng Du Xiang Yang Zhang Jian Liang Lu Jian Wei Ku Dong Yun Zhang Yao Zhang Zong Min Fan Li Dong Wang
