HSD17B1 and chronic obstructive pulmonary disease: In addition, high expression of HSD17B1 is associated with deviated follicular fluid steroid levels in polycystic ovarian syndrome (Yu et al., 2021), foetal growth restriction (Zhu et al., 2018), chronic obstructive pulmonary disease (COPD; (Konings et al., 2017); and other disorders including lung cancer, skin and eye diseases (Konings et al., 2018a; Heinosalo et al., 2019).