SGN-CD70A inhibits cell growth and induces apoptosis in CD70-expressing CTCL cell lines. (A-B) Histograms and bar graph of CD70 expression level in CD4⁺ cells of CTCL cell lines HH, MJ, Hut78, and H9, and T-cell leukemia cell lines CCRF-CEM, HPB-ALL, PF-382, and Jurkat. (C) SGN-CD70A inhibits cell proliferation in CTCL and T-cell leukemia cell lines. Cells were incubated with PBS, IgG control, or SGN-CD70A for 48 hours before the cell viability was examined. Data were presented as mean ± SEM from 3 independent experiments. (D) SGN-CD70A induces apoptosis in Hut78 and H9 cells. Cells were incubated with PBS, IgG control, or SGN-CD70A for 48 hours, and apoptosis was subsequently determined by the annexin V/PI assay.