MCAM and melanoma: Similar to others, CD146, also referred to as melanoma cell adhesion molecule (MCAM), is used to capture melanoma CTCs (Rao et al. 2011; Freeman et al. 2012; Aya‐Bonilla et al. 2017; Beasley et al. 2021; Kang et al. 2022), as this marker has been described as being nearly universally expressed in melanoma (Medic et al. 2007).