Clinicopathological Characteristics of Multiple Primary Malignancies Involving Female Genital Tract at a Tertiary Cancer Institute of Northeast India.

Background: The term "Multiple Primary Malignant Neoplasms (MPMNs)" refers to two or more unrelated primary malignant neoplasms that originate from single or different organs and occur in one patient. MPMNs have been divided into synchronous and metachronous based on time duration after first malignancy. Materials and Methods: This was a hospital-based retrospective study conducted at a tertiary cancer institute in Northeast India. Clinicopathological factors of patients with multiple primary malignancies with at least one female genital tract malignancy attending the gynecological oncology outpatient department were observed. Those with ambiguous status of primary malignancy and incomplete treatment of first primary malignancy were excluded from the study. Results: A total of 57 patients with MPMN, including one case of triple primary malignancy, were included in the study. 59.18% of cases had metachronous, and 40.81% had synchronous malignancies. The median time to the development of second primary malignancy was 60 months. Among the first diagnosed malignancies, cervix was the most common site (26.5%), followed by endometrium (20.4%) and ovary (14.28%), whereas ovarian malignancy was more commonly diagnosed second malignancy (38.77%), followed by endometrium (14.28%) and cervix (10.2%). In an analysis of synchronous malignancies, the most common genital tract involvement was seen with endometrium and ovary, with a predominance of low-grade endometrioid histology in 75% of cases. Conclusions: As the cancer survivor population continues to increase in future, these patients must be comprehensively evaluated on follow-up, and a cognizance of prior treatment taken should be kept. In addition, it is vital that the clinicians keep a lookout for high-risk population in which genetic testing may be beneficial.