DDX53 and neoplasm: H2Py4BC demonstrates pronounced photoinduced activity in vitro against tumor cells of various genesis (IC50 is 32.0 ± 2.0 nM for HEp2, 35.2 ± 2.4 nM for EJ, 68.2 ± 1.6 nM for S37, 21.4 ± 1.4 nM for CT26, and 21.6 ± 1.5 nM for LLC) without dark toxicity.