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| Location of the primary tumour | Cervical oesophagus | Upper thoracic oesophagus | Mid thoracic oesophagus | Lower thoracic oesophagus | Total |
| Lymphovascular and perineural invasion of the primary lesion | |||||
| Present | 0 | 0 | 1 (3.2%) | 6 (19.4%) | 7 (22.6%) |
| Absent | 0 | 5 (16.1%) | 6 (19.4%) | 13 (41.9%) | 24 (77.4%) |
| Total | 0 | 5 (16.1%) | 7 (22.6%) | 19 (61.3%) | 31 (100%) |
