Lauren classification combined with HER2 status is a better prognostic factor in Chinese gastric cancer patients

Miaozhen Qiu, Yixin Zhou, Xinke Zhang, Zixian Wang, Fang Wang, Jianyong Shao, Jiabin Lu, Ying Jin, Xiaoli Wei, Dongsheng Zhang, Fenghua Wang, Yuhong Li, Dajun Yang, Ruihua Xu, Miaozhen Qiu, Yixin Zhou, Xinke Zhang, Zixian Wang, Fang Wang, Jianyong Shao, Jiabin Lu, Ying Jin, Xiaoli Wei, Dongsheng Zhang, Fenghua Wang, Yuhong Li, Dajun Yang, Ruihua Xu

Abstract

Background: Lauren-classification and human epidermal growth factor receptor 2 (HER2) status are two important pathological features of gastric cancer patients. The prognostic value of HER2 in gastric cancer remains controversial. Intestinal type gastric cancer has better prognosis and higher HER2 positive proportion. What is the interaction between these two factors? We hypothesized that a combination of Lauren-classification and human epidermal growth factor receptor 2 (HER2) status (L-H status) might be more meaningful than either factor alone.

Methods: We collected 838 gastric cancer patients at all stages who had received treatment in our cancer center. This study was registered in the website of ClinicalTrials.Gov, with the number NCT01927146. We divided the patients into six groups according to their L-H status: Group A, HER2 negative and intestinal type; Group B, HER2 positive and intestinal type; Group C, HER2 negative and diffuse type; Group D, HER2 positive and diffuse type; Group E, HER2 negative and mixed type; and Group F, HER2 positive and mixed type.

Results: Diffuse type and intestinal type accounted for 51.0% and 33.9%, respectively. The proportion of HER2 positive patients was 11.2%, 25.4%, 2.1% and 10.2% in the whole patient group, intestinal, diffuse and mixed type, respectively. Median overall survival was 34.0 months, 25.3 months, 27.6 months, 19.2 months, 25.9 months and 26.4 months in the six groups patients, P = 0.053. There was a significant difference in survival among the first four groups (P < 0.001). HER2 was an independent prognostic factor in the intestinal type and in stage I + II patients, but not in the diffuse type or stage III + IV patients. L-H status was an independent prognostic factor in patients at all stages. For the diffuse and intestinal types, the multivariate analysis showed that HER2 was not an independent prognostic factor, while Lauren classification and L-H status were. Moreover, L-H status was a better prognostic factor than the Lauren classification.

Conclusions: L-H status is a prognostic factor in diffuse and intestinal type patients, but not in the mixed type. Patients with HER2 negative and intestinal type had the best survival, while patients with HER2 positive status and diffuse type had the worst survival.

Figures

Figure 1
Figure 1
The survival difference among different L-H status.
Figure 2
Figure 2
Kaplan–Meier curves of HER2-positive and -negative patients for overall survival in (A), intestinal type (B), diffuse type (C), TNM stage I/II and (D) TNM stage III/IV.
Figure 3
Figure 3
Kaplan–Meier curves of L-H status for overall survival in (A), TNM stage I/II and (B) TNM stage III/IV.

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