Detection of occult lymph node metastases in esophageal cancer by minimally invasive staging combined with molecular diagnostic techniques.
OBJECTIVE
Lymph node metastases are the most important prognostic factor in patients with esophageal cancer. Histologic examination misses micrometastases in up to 20% of lymph nodes evaluated. In addition, non-invasive imaging modalities are not sensitive enough to detect small lymph nodes metastases. The objective of this study was to investigate the use of reverse transcriptase-polymerase chain reaction (RT-PCR) of messenger RNA (mRNA) for carcinoembryonic antigen (CEA) to increase the detection of micrometastases in lymph nodes from patients with esophageal cancer.


METHODS
RT-PCR of CEA mRNA was performed in lymph nodes from patients with malignant and benign esophageal disease. Each specimen was examined histopathologically and by RT-PCR and the results were compared.


RESULTS
Metastases were present in 29 of 60 (48%) lymph nodes sample by minimally invasive staging from 13 patients with esophageal cancer when examined histopathologically. RT-PCR identified nodal metastases in 46 of these 60 (77%) samples. RT-PCR detected CEA mRNA in all 29 histologically positive samples and in 17 histologically negative lymph nodes. All lymph nodes from patients with benign disease (n = 15) were negative both histopathologically and by RT-PCR. The stage of two patients was reclassified based on the RT-PCR results, which identified lymph node spread undetected histopathologically. Both of these patients developed recurrent disease after resection of the primary tumor.


CONCLUSIONS
RT-PCR is more sensitive than histologic examination in the detection of lymph node metastases in esophageal cancer and can lead to diagnosis of a more advanced stage in some patients. The combination of minimally invasive surgical techniques in combination with new molecular diagnostic techniques may improve our ability to stage cancer patients.
Kassis
E S
ES
Department of Surgery, University of Pittsburgh Medical Center, PA 15213, USA.
Nguyen
N
N
Shriver
S P
SP
Siegfried
J M
JM
Schauer
P R
PR
Luketich
J D
JD
D000230:Adenocarcinoma / Q000473:pathology* / Q000556:secondary* / Q000601:surgery; D001483:Base Sequence; D014408:Biomarkers, Tumor / Q000032:analysis*; D001707:Biopsy, Needle; D002272:Carcinoembryonic Antigen / Q000032:analysis*; D004938:Esophageal Neoplasms / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology; D008207:Lymphatic Metastasis; D008297:Male; D019060:Minimally Invasive Surgical Procedures; D008969:Molecular Sequence Data; D009367:Neoplasm Staging; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis*; D012334:RNA, Neoplasm / Q000032:analysis*; D012016:Reference Values; D012680:Sensitivity and Specificity
D014408:Biomarkers, Tumor; D002272:Carcinoembryonic Antigen; D012333:RNA, Messenger; D012334:RNA, Neoplasm