Sequential Toripalimab and Paclitaxel in Patients With Head and Neck Squamous Cell Cancer (HNSCC) and Poor Performance Status

Toripalimab treatment will be administered on an outpatient basis. Toripalimab will be given in the clinic on Day 1. Intravenous (IV) infusions will be given every three weeks thereafter for the first seven weeks of the study. Administration follows standard of care. Paclitaxel treatment will be administered on an outpatient basis as per standard of care once weekly for a total of eight weeks during Weeks 8-15 of each cycle. Premedication and administration follow standard of care. After eight weeks of chemotherapy, the participant finishes the cycle with two weeks of rest (no treatment). This will be repeated for a total of 51 weeks total of 3 cycles (each cycle is 17 weeks) We will study sequential ICI and CT on HNSCC, and the impact on quality of life in addition to studying the tumor microenvironment. Participants undergo an optional biopsy before and after eight weeks of weekly paclitaxel. To explore the cytotoxic signature, we will calculate the enrichment scores for canonical cytotoxic markers (GZMA, GZMB, GZMK, GNLY, IFNG, PRF1 and NKG7). To estimate the signature of collagen formation, we will calculate enrichment scores using the gene lists from the REACTOME\_COLLAGEN\_FORMATION pathway (msigdb.v7.5.1.symbols.gmt; https://www.gsea-msigdb.org/gsea/index.jsp). To explore the cell type contexts, we will perform principal component analysis (PCA) and then uniform manifold approximation and projection (UMAP) using the RunPCA and RunUMAP functions based on the cell type proportion inferred by spatial transcriptomics deconvolution (STRIDE). Results will be summarized using descriptive statistics, including mean, median, standard deviation, range, count, and percentage, as appropriate.