Cancer of the lip.

In Great Britain the lip is not a very common site for cancer but in Northern Ireland the condition continues to provide between 6.5 and 8.5 per cent of all new cases treated at the Radiotherapy Centre. Over a twelve year period 990 cases of lip cancer were registered-964 of the lower, and 25 of the upper, i.e., 2.7 per cent of the total-a figure very similar to that reported in other series. Cancer of the upper lip, it is generally agreed, differs from that of the lower lip in its aetiology, behaviour and malignancy and this review, therefore, is confined to those tumours arising in the mucous membrane or vermilion area of the lower lip.