Information on the genomic landscape of HCLv is also based on limited data—namely, WGS in 7 cases published in abstract from only [125], WES in 7 cases [43] targeted sequencing using a cancer gene panel in 12 cases [11,42], and targeted sequencing of MAP2K1 in 25 cases [42,124,126] and of TP53 in 30 cases [127]. The gene discussed is MAP2K1; the disease is cancer.