Among women with type 2 endometrial cancer, diagnostic hysteroscopy may not be associated with increased odds of positive peritoneal cytology at the time of surgical staging or with decreased survival, according to a retrospective study of 127 patients.
a researcher said at the meeting sponsored by AAGL, held virtually this year.
Possible associations between cytology and procedures
Prior research has found that positive peritoneal cytology may correlate with greater likelihood of death among patients with endometrial cancer, and researchers have wondered whether pressure on the uterine cavity during hysteroscopy increases the presence of positive peritoneal cytology. “According to some systematic reviews ... it seems that it does,” said study author Luiz Brito, MD, PhD, associate professor of obstetrics and gynecology at the University of Campinas in Brazil.
Nevertheless, research suggests that “most of the time hysteroscopy does not have a powerful impact on the prognosis of these patients,” he said.
Studies have tended to focus on patients with type 1 endometrial cancer, however. Type 2 endometrial cancer, which is more aggressive, “is scarcely studied,” Dr. Brito said. One retrospective study that focused on type 2 endometrial cancer included 140 patients. Among patients who underwent hysteroscopy, 30% had positive cytology. In comparison, 12% of patients in the curettage group had positive cytology. But the difference in disease-specific survival between groups was not statistically significant, and about 33% of the patients in each group developed a recurrence.
To examine associations between diagnostic methods and outcomes in another group of patients with type 2 endometrial cancer, Dr. Brito and colleagues analyzed data from a hospital registry in Brazil.
The database included 1,183 patients with endometrial cancer between 2002 and 2017, including 235 patients with type 2 endometrial cancer. After excluding patients with synchronous tumor and those who did not undergo surgery or did not have peritoneal cytology performed, 127 patients remained for the analysis. The study included follow-up to December 2019.
The researchers compared the prevalence of positive peritoneal cytology among 43 patients who underwent hysteroscopy with that among 84 patients who underwent curettage. The groups had similar baseline characteristics.
Positive peritoneal cytology was more common in the curettage group than in the hysteroscopy group (10.7% vs. 4.6%), although the difference was not statistically significant. Lymphovascular invasion and advanced surgical staging were more common in the curettage group.
In a multivariate analysis, older age and advanced cancer staging were the only factors associated with decreased disease-free survival. Age, advanced cancer staging, and vascular invasion were associated with decreased disease-specific survival.
The researchers also had considered factors such as peritoneal cytology, diagnostic method, age of menarche, menopause time, parity, comorbidities, smoking status, body mass index, abnormal uterine bleeding, histological type, and adjuvant treatment.
A limitation of the study is that it relied on data from a public health system that often has long wait times for diagnosis and treatment, Dr. Brito noted.
Some doctors may forgo cytology
The available research raises questions about the role and relevance of peritoneal cytology in caring for patients with endometrial cancer, René Pareja, MD, a gynecologic oncologist at Instituto Nacional de Cancerología, Bogotá, Colombia, said in a discussion following the presentation.
Peritoneal cytology has not been part of endometrial cancer staging since 2009, Dr. Pareja said. Still, guidelines recommend that surgeons collect cytology during surgical staging, with the idea that the results could inform adjuvant treatment decisions.
“Peritoneal cytology is recommended in the guidelines, but there are no recommendations on how to proceed if it is positive,” Dr. Pareja said. “While some gynecologic oncologists continue to take cytology during endometrial cancer staging, some have stopped doing so. And in Colombia, most of us are not performing pelvic cytology.”
Although some studies indicate that hysteroscopy may increase the rate of positive cytology, positive cytology may not be associated with worse oncological outcomes independent of other risk factors for recurrence, said Dr. Pareja.
So far, studies have been retrospective. Furthermore, the sensitivity and specificity of pelvic cytology tests are not 100%. “Should we continue performing pelvic cytology given the results of this and other studies?” Dr. Pareja asked.
Despite limited knowledge about this variable, physicians may want to be aware if a patient has positive cytology, Dr. Brito suggested. “At least it will give us some red flags so we can be attentive to these patients.”
If researchers were to design a prospective study that incorporates hysteroscopic variables, it could provide more complete answers about the relationship between hysteroscopy and peritoneal cytology and clarify the importance of positive cytology, Dr. Brito said.
Dr. Brito had no relevant disclosures. Dr. Pareja disclosed consulting for Johnson & Johnson.
SOURCE: Oliveira Brito LG et al. J Minim Invasive Gynecol. 2020 Nov. doi: 10.1016/j.jmig.2020.08.356.