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1. PD-L1/PD-1 antibodies are immune checkpoint blocking drugs that help T cells recognize and kill tumor cells by blocking the interaction between PD-1 and PD-L1.

2. T cells are the main component of lymphocytes and play a crucial role in fighting infection and suppressing tumors.

3. There are currently 9 PD-1 and PD-L1 inhibitors in the clinical development stage, with pembrolizumab (Keytruda) and nivolumab (Opdivo) being approved by the US FDA for the treatment of various cancers. However, these drugs can also cause serious adverse reactions, so caution should be exercised when using them.

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