TGFB1 and neoplasm: Previous studies have suggested that platelets may play a role in tumor growth and metastasis (Borsig et al., 2001; Coupland et al., 2012; Haemmerle et al., 2017; Palumbo et al., 2005; Xu et al., 2018), with one suggesting that platelets can suppress T cells via TGFβ–GARP axis (Rachidi et al., 2017).