Pregnancy-associated melanoma (PAM): A single institution retrospective review between 2005 and 2023.

30 Background: Melanoma is the most prevalent cancer during pregnancy, representing 31% of all gestational cancers, with its incidence rates rising globally. Pregnancy-associated melanoma (PAM) presents unique challenges in diagnosis and management due to maternal physiological and hormonal changes, as well as consideration of fetal impact. This study aims to understand the impact of pregnancy on melanoma outcomes to optimize patient care. Methods: We conducted a retrospective study of patients diagnosed with PAM at The University of Texas MD Anderson Cancer Center between 2005 and 2023. Eligible patients were diagnosed either during pregnancy or within one year of delivery. Frequencies and percentages were used to describe the study population. Our primary outcome was to describe melanoma characteristics and prognosis, and our secondary outcome was to investigate melanoma’s impact on obstetrical outcomes. Results: The study included 76 patients with a mean age of 31.3 ± 4.4 years, 93.4% of whom were of white or Caucasian origin. The median follow-up was 39.8 months. Diagnoses included Stage 0 (7.9%), Stage I (36.8%), Stage II (3.9%), Stage III (22.4%), and Stage IV (25%) melanoma. The mean Breslow Thickness was 2.1± 4.7 mm. Primary diagnoses occurred in 76.6% of patients, while 21.9% experienced recurrent episodes during pregnancy. At the time of their PAM event, 47.4% had localized disease, and 48.7% had metastatic disease. The average mean time from diagnosis to first surgery was 2.1 months in patients diagnosed during pregnancy (group 1) and 0.9 months in patients diagnosed after pregnancy (group 2). The average time from diagnosis to systemic therapy was 3.3 ± 2.8 months in group 1 and 1 ± 0.7 months in group 2. Patients diagnosed during pregnancy had an average gestational age of 17.8 weeks: 30.65% were diagnosed in the first trimester, 54.84% in the second, and 14.52% in the third trimester. Thirty-three (43.4%) patients had term deliveries, while fifteen (19.7%) patients gave birth prematurely. There were 75.0% live births, 5.3% spontaneous abortions and 3.9% elective terminations. Conclusions: Our findings contribute to the limited literature on PAM outcomes, emphasizing the importance of a collaborative approach in managing these patients. Close surveillance of pregnant patients with melanoma is essential to prevent treatment delays and ensure optimal maternal and fetal outcomes.