Maternal and perinatal outcomes following a diagnosis of Hodgkin lymphoma during or prior to pregnancy: A systematic review

BACKGROUND: The initial peak incidence of Hodgkin lymphoma (HL) occurs during reproductive years. OBJECTIVES: Synthesise published literature on the relationship between HL and maternal and perinatal outcomes. SEARCH STRATEGY: Systematic search of PubMed/Medline, Cochrane Library, Scopus, Embase and Science Direct from inception to June 2022, supplemented by hand‐searching reference lists. SELECTION CRITERIA: Two reviewers independently reviewed titles, abstracts and full‐text articles. Published studies containing original data were eligible. DATA COLLECTION AND ANALYSIS: Two reviewers independently extracted data and appraised study quality. Outcomes for pregnant women with a previous/current diagnosis of HL were compared separately with women never diagnosed with HL. Where data permitted, meta‐analyses of odds ratios and proportions were performed. Certainty of evidence was determined using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) framework. MAIN RESULTS: Of the 5527 studies identified, 33 met the inclusion criteria. In the groups with HL before pregnancy and HL during pregnancy, adjusted odds ratios were not statistically significant for congenital malformation (aOR 1.7, 95% CI 0.9–3.1, and aOR 1.84, 95% CI 0.81–4.15, respectively), preterm birth (PTB) (aOR 0.99, 95% CI 0.65–1.51, and aOR 6.74, 95% CI 0.52–88.03, respectively) and miscarriage (aOR 0.78, 95% CI 0.55–1.10, and aOR 0.38, 95% CI 0.05–2.72, respectively). The aORs for all other outcomes were not statistically significant, except for blood transfusion (aOR 1.38, 95% CI 1.05–1.82) and venous thromboembolism (VTE) (aOR 7.93, 95% CI 2.97–21.22) in the group for HL during pregnancy. The proportion of anaemia was also increased in this group (69%, 95% CI 57%–80% vs 4%, 95% CI 4%–5%, respectively). The GRADE certainty of findings ranged from low to very low. CONCLUSIONS: Rates of most adverse pregnancy outcomes among women with a previous/current HL diagnosis are not increased significantly compared with the general pregnant population. Women with HL diagnosed during pregnancy may have a higher PTB rate and increased likelihood of VTE, anaemia and blood transfusion; however, small study numbers and the low to very low GRADE certainty of findings preclude firm conclusions.