Journal List > Korean J Gastroenterol > v.62(6) > 1007169

Lew, Jung, Kim, Min, Ha, Kim, Kim, and Ko: Clinicopathological Characteristics and Prognosis of Alpha-fetoprotein Producing Gastric Cancer

Abstract

Background/Aims

Several studies reported a subgroup of gastric cancer patients showing elevated serum alpha-fetoprotein (AFP) at the time of diagnosis. We investigated the clinicopathological characteristics and prognostic factors of AFP producing gastric cancer (AFPPGC) by comparing with AFP non-producing gastric cancer (AFPNPGC).

Methods

A total of 909 patients were diagnosed with gastric cancer from January 2005 to March 2013 at Gyeongsang National University Hospital and their AFP levels were measured at the time of diagnosis. After excluding 138 patients with underlying liver diseases, 34 patients with elevated serum AFP level over 10 mg/mL were assigned to AFPPGC group and the remaining 737 patients with serum level of AFP below 10 ng/mL were assigned to AFPNPGC group.

Results

The median survival length was shorter in AFPPGC group than AFPNPGC group (18.3±25.5 months vs. 30.0±22.0 months, p=0.004). The incidence of liver metastasis (47.1% vs. 3.3%, p<0.001) and lymph node metastasis (91.2% vs. 31.6%, p<0.001) was significantly higher in AFPPGC group. The probability of encountering metachronous liver metastasis after the operation was higher in AFPPGC group (44.4% vs. 2.0%, p<0.001). Multivariate analysis revealed that patients in the AFPPGC group who received chemotherapy (p=0.037) or underwent operation (p=0.001) had a better survival rate.

Conclusions

AFPPGC behaves more aggressively and shows a worse prognosis. Therefore, serum AFP level should be routinely checked in all patients diagnosed with gastric cancer.

References

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Fig. 1.
Patient selection.
kjg-62-327f1.tif
Fig. 2.
(A) Immunohistochemical staining in AFP-producing gastric cancer. Gastric adenocarcinoma cells express AFP in the cytoplasm of some tumor cells and in the glandular lumina (AFP, ×100). (B) Immunohistochemical staining in AFP non-producing gastric cancer. Gastric adenocarcinoma in this case is negative for AFP (×100).
kjg-62-327f2.tif
Fig. 3.
Survival of gastric cancer patients compared with those of the same stage according to AFP production. Survival of AFPPGC is shorter than that of AFPNPGC with same stage. AFPPGC, AFP producing gastric cancer; AFPNPGC, AFP non-producing gastric cancer.
kjg-62-327f3.tif
Table 1.
Case Series of Patients with Alpha-fetoprotein-producing Gastric Cancer
No. Sex Age (yr) Serum AFP (ng/mL) Stage Metastasis Treatment Recurrence after operation (duration, mo) Survival (mo)
1 M 50 215,444.0 IV M1 Liver CTx 12
2 M 74 60,500.0 IV T2N2M1 Liver CTx 2
3 F 73 60,500.0 IV T2N1M1 Liver 2
4 M 63 60,500.0 IV M1 Liver CTx 17
5 F 79 3,587.0 IV T2N1M1 Liver CTx 5
6 M 53 2,420.0 IV M1 Liver CTx 21 (alive)
7 M 54 1,064.0 II T2N1M0 OP Liver, pancreas, jejunum, peritoneum (48) 50
8 M 69 663.2 IV T4N1M1 Liver, pancreas CTx 11
9 M 59 604.0 IV M1 Liver 1
10 M 75 501.0 IV M1 Liver 6
11 M 63 298.0 IIIa CTx 6
12 M 60 149.6 IIIa T3N1M0 OP+CTx Liver (15) 24
13 M 68 107.1 IIIa T3N1M0 OP+CTx 18 (f/u loss)
14 M 76 100.4 IV T4N1M1 Liver, pancreas CTx 6
15 M 63 88.0 IIIa T2N2M0 OP+CTx Liver (29) 30
16 F 78 80.5 IV M1 Liver CTx 7 (alive)
17 M 56 80.0 IV M1 Liver 5
18 M 59 78.3 IV T3N2M1 Liver CTx 11
19 F 67 73.0 IV M1 3
20 M 51 71.0 IV M1 CTx 2
21 M 72 66.1 II T3N0M0 OP+CTx   74 (alive)
22 M 56 62.9 II T2N1M0 OP+CTx Liver (13) 22
23 F 71 56.4 Ia T1N0M0 OP 123 (alive)
24 F 59 46.6 IV M1 CTx 22 (alive)
25 M 46 40.6 IV M1 CTx 4
26 M 60 38.7 IIIa OP+CTx 13
27 M 61 34.4 IV M1 Liver CTx 19
28 M 64 30.2 IIIa OP+CTx 13
29 M 53 27.1 IV M1 CTx 7
30 M 51 21.3 Ia T1N0M0 OP 70
31 M 72 20.5 IV M1 Liver 2
32 M 53 17.9 IV M1 Liver CTx 10
33 M 55 17.4 IV M1 CTx 6
34 M 80 14.7 IV M1 CTx 2
Average   64 11,982.4         18.3

M, male; F, female; CTx, chemotherapy; OP, operation; f/u, follow up.

Table 2.
Comparison between AFP-producing Gastric Cancer Patients and AFP Non-producing Gastric Cancer
  AFPPGC (n=34) AFPNPGC (n=737) p-value
Age (yr) 64.0±10.3 61.6±11.7 0.244
Sex (Male: female) 3.25: 1 2.19: 1 0.360
Location of tumor     0.002
 Cardia 0 48 (6.6)  
 Body 10 (29.4) 277 (38.3)  
 Antrum 13 (38.2) 330 (45.6)  
 Antrum to body 8 (23.5) 56 (7.7)  
 Antrum to cardia 2 (5.9) 6 (0.8)  
 Cardia to body 1 (2.9) 7 (1.0)  
Advanced gastric carcinoma 32 (94.1) 323 (43.8) <0.001
Early gastric carcinoma 2 (5.9) 414 (56.2)  
Metastasis to lymph nodes 31 (91.2) 229 (31.6) <0.001
Stage      
 Ia 2 (5.9) 392 (54.1)  
 Ib 1 (2.9) 80 (11.0)  
 II 7 (20.6) 114 (15.7)  
 IIIa 5 (14.7) 33 (4.6)  
 IIIb   19 (2.6)  
 IIIc   21 (2.9)  
 IV 19 (55.9) 65 (9.0)  
Operation 9 (26.5) 648 (89.6) <0.001
Survival length (mo) 18.3±25.5 30.0±22.0 0.004
Liver metastasis      
 Pre operation 16 (47.1) 24 (3.3) <0.001
 Post operation 4 (44.4) 13 (2.0) <0.001
Metastasis to other organs      
 Pre operation 21 (61.8) 73 (9.9) <0.001
 Post operation 2 (5.9) 22 (3.0) 0.286
Time to recurrence after      
 operation (mo)      
 Liver 22.0±16.9 14.2±9.7 0.373
 Other organs 32.5±11.6 26.7±4.0 0.771
Pathologic finding     <0.001
 Well-differentiated 0 223 (30.3)  
 Moderately-differentiated 14 (41.2) 176 (23.9)  
 Poorly-differentiated 17 (50.0) 196 (26.6)  
 Signet ring cell carcinoma 3 (8.8) 142 (19.3)  
Patients who underwent resection n=9 n=648  
Tumor size (cm)     0.006
 <1 0 (0) 100 (15.4)  
 ≥1, <5 2 (22.2) 385 (59.4)  
 ≥5, <10 7 (77.8) 141 (21.7)  
 ≥10 0 (0) 22 (3.3)  
Lymphatic invasion 6 (66.7) 44 (6.7) <0.001
Vessel invasion 1 (11.1) 3 (0.5) 0.053
Neural invasion 4 (44.4) 44 (6.7) <0.001

Values are presented as mean±SD or n (%).

AFPPGC, AFP-producing gastric cancer (serum AFP ≥10 ng/mL); AFPNPGC, AFP non-producing gastric cancer (serum AFP <10 ng/mL).

Table 3.
Univariate Survival Analysis of All Gastric Cancer Patients according to Clinical Factors
Variable Cases (n) 5-year survival rate (%) p-value
Sex     0.919
 Male 528 74  
 Female 230 80  
Smoking     0.037
 Smoker 234 71  
 Non smoker 524 79  
Location     <0.001
 Cardia 48 62  
 Body 287 78  
 Antrum 343 79  
 Antrum to body 64 71  
 Antrum to cardia 8 0  
 Cardia to body 8 0  
Stage     <0.001
 Ia 394 95  
 Ib 81 89  
 II 121 66  
 IIIa 38 48  
 IIIb 19 85  
 IIIc 21 90  
 IV 84 0  
Age (yr)     0.012
 30–39 31 62  
 40–49 103 83  
 50–59 159 76  
 60–69 251 78  
 70–79 185 82  
 80- 29 0  
Pathologic finding     <0.001
 Well-differentiated   98  
 Moderately-differentiated   88  
 Poorly-differentiated   86  
 Signet ring cell carcinoma   89  
AFP (ng/mL)     <0.001
 ≥10   18  
 <10   79  
Table 4.
Independent Prognostic Factors in Multivariate Analysis by Cox Proportional Hazard Model in All Patients with Gastric Cancer
  Hazard ratio 95% CI p-value
AFP 1.773 1.074–2.927 0.025
Smoking 1.646 1.111–2.437 0.013
Stage      
 Ia      
 Ib 1.292 0.353–4.726 0.442
 II 5.382 2.427–11.934 <0.001
 IIIa 17.327 7.358–40.801 <0.001
 IIIb 2.348 0.295–18.704 0.420
 IIIc 2.636 0.330–21.050 0.361
 IV 76.464 36.677–159.414 <0.001
Table 5.
Univariate Analysis of Factors Affecting Survival in Patients with AFP-producing Gastric Cancer
Factor Case (n) Survival (mo) p-value
Smoker 18 32.1 0.096
Non-smoker 16 23.6  
Alcohol drinker 23 15.9 0.579
Non-drinker 11 33.3  
Location     0.686
 Body 10 22.6  
 Antrum 13 22.1  
 Cardia 8 46.1  
 Antrum to cardia 2 2.0  
 Body to cardia 1 22.0  
AGC or EGC     0.193
 AGC 32 13.5  
 EGC 2 96.5  
Chemotherapy     0.377
 Yes 22 13.0  
 No 12 44.5  
Operation     <0.001
 Yes 9 69.9  
 No 25 9.4  
Lymph node metastasis     0.044
 Yes   19.3  
 No   90.0  
Stage    
 Ia 2 96.5  
 Ib 1 24.0  
 II 7 27.9  
 IIIa 5 8.0  
 IIIb 0  
 IIIc 0  
 IV 19 8.9  

AGC, advanced gastric cancer; EGC, early gastric cancer.

Table 6.
Survival of Gastric Cancer Patients with Liver Metastasis according to AFP Production
  AFPPGC AFPNPGC p-value
Age (yr) 67.8±10.9 67.3±10.3 0.901
Sex (male: female) 3:1 5.25:1 0.689
Pathologic finding     0.245
 Well-differentiated 0 4 (16)  
 Moderately-differentiated 8 (50) 13 (52)  
 Poorly-differentiated 8 (50) 8 (32)  
 Signet ring cell carcinom a 0 0  
Survival length (mo) 8.7 14.6 0.080

Values are presented as mean±SD, n (%), or number only. AFPPGC, AFP-producing gastric cancer (serum AFP ≥10 ng/mL); AFPNPGC, AFP non-producing gastric cancer (serum AFP <10 ng/mL).

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