Peritoneal washing cytology in cervical carcinoma. Analysis of 109 patients.

The peritoneal washing cytologies of 109 patients (112 procedures) undergoing laparotomy for cervical carcinoma were evaluated retrospectively and compared with the clinical and pathologic findings. Nine patients (8.3%) had malignant peritoneal washings (including three of four with washings initially termed "inconclusive"). Four (4.9%) of the 82 patients with squamous carcinoma and 3 (16.7%) of 18 with adenocarcinoma had positive washings. Five (5.6%) of 90 washings obtained at initial explorations were positive, as compared with 4 (18.2%) of 22 washings obtained as follow-up operations in recurrent cases. The 111 peritoneal washing cytologies with a corresponding histologic evaluation of the peritoneal cavity showed a good correlation; peritoneal washing cytology had an efficiency of 91.0%, a sensitivity of 52.9% and a specificity of 100%. Two cases in which the cytologies were considered positive only after review had negative peritoneal histologies; both patients died of progressive disease within 11 months. Peritoneal washing cytology was positive in 5 (5.9%) of 84 cases with FIGO stage 1 cancers, 2 (18.2%) of 11 cases with stage 2 cancers, 1 (33.3%) of 3 cases with stage 3 cancers, and 1 (10%) of 10 cases with recurrent tumors. Eight (88.9%) of nine patients with malignant peritoneal washings died of disease from 3 to 15 months following surgery; one showed no evidence of disease at 9 months. These results suggest that: (1) cervical carcinomas are infrequently associated with a positive peritoneal washing; (2) peritoneal washing cytology is more likely to be positive in cases of adenocarcinoma than in cases of squamous carcinoma; (3) peritoneal washings obtained at the time of surgery for recurrence are more likely to contain malignant cells than are washings obtained during initial exploration; (4) nonkeratinizing malignant squamous cells may be confused with reactive mesothelial cells; and (5) peritoneal washing cytology is a relatively insensitive technique for detecting advanced cervical disease, but correlates with a poor prognosis when positive.