Thus, according to the PhosphoSitePlus data (Hornbeck et al., 2019), the identified modification variants ApoB 1287-PTR/1288-TPO and TTR 25-TPO were found in biosamples collected from patients with T-cell leukemia; CFB phosphorylation variants were annotated in patients with gastric carcinoma; C4A/C4B and F2 proteins phosphorylated at other sites were identified in breast, ovarian, stomach, head/neck, and colorectal cancers. Here, TTR is linked to T-cell leukemia.