HMGB1 and lymphoma: The lymphoma cells treated with hWJSC-CM undergo immunogenic cell death and exhibited “find-me/eat-me”-danger-associated molecular pattern (DAMP) signals such as the surface bound calreticulin (ecto-CRT), ecto-Hsp70 and ecto-Hsp90, adenosine thiophosphate, and HMGB1 and the downregulation of PD-L1 and CD47 [18–20].