Analysis of risk factors for post-operative recurrence or progression of intravenous leiomyomatosis

Objective To analyse the risk factors for post-operative recurrence or progression of intravenous leiomyomatosis and explore the impact of different treatment strategies on patient prognosis.Methods Patients with intravenous leiomyomatosis who underwent surgery from January 2011 to December 2020 and who were followed for >= 3 months were included. The primary endpoint was recurrence (for patients with complete resection) or progression (for patients with incomplete resection). Kaplan-Meier survival analysis was used to analyse the factors affecting recurrence.Results A total of 114 patients were included. The median age was 45 years old (range 24-58). The tumors were confined to the uterus and para-uterine vessels in 48 cases (42.1%), while in 66 cases (57.9%) it involved large vessels (iliac vein or genital vein and/or proximal large veins). The median follow-up time was 24 months (range 3-132). Twenty-nine patients (25.4%) had recurrence or progression. The median recurrence or progression time was 16 months (range 3-60). Incomplete tumor resection (p=0.019), involvement of the iliac vein or genital vein (p=0.042), involvement of the inferior vena cava (p=0.025), and size of the pelvic tumor >= 15 cm (p=0.034) were risk factors for recurrence and progression. For intravenous leiomyomatosis confined to the uterus or para-uterine vessels, no post-operative recurrence after hysterectomy and bilateral oophorectomy occurred in this cohort. Compared with hysterectomy and bilateral oophorectomy, the risk of recurrence after tumorectomy (with the uterus and ovaries retained) was significantly greater (p=0.009), while the risk of recurrence after hysterectomy was not significantly increased (p=0.058). For intravenous leiomyomatosis involving the iliac vein/genital vein and the proximal veins, post-operative aromatase inhibitor treatment (p=0.89) and two-stage surgery (p=0.86) were not related to recurrence in patients with complete tumor resection.Conclusion Incomplete tumor resection, extent of tumor lesions and size of the pelvic tumor were risk factors for post-operative recurrence and progression of intravenous leiomyomatosis.