Article Text

Download PDFPDF

78 T-Cell, MHC i, and tumor intrinsic gene signatures predict clinical benefit and resistance to tislelizumab monotherapy in pretreated PD-L1+ urothelial carcinoma
  1. Dingwei Ye1,
  2. Aiping Zhou2,
  3. Qing Zou3,
  4. Hanzhong Li4,
  5. Cheng Fu5,
  6. Hailong Hu6,
  7. Jian Huang7,
  8. Wei Shen8,
  9. Yun Zhang8,
  10. Xiaopeng Ma8,
  11. Pei Zhang8,
  12. Ruiqi Huang8,
  13. Xiusong Qiu8,
  14. Lilin Zhang8 and
  15. Feng Bi9
  1. 1Fudan University Shanghai Cancer Center, Shanghai, China
  2. 2Chinese Academy of Medical Sciences, Beijing, China
  3. 3Jiangsu Cancer Hospital, Nanjing, China
  4. 4Peking Union Medical College Hospital, Beijing, China
  5. 5Liaoning Cancer Hospital and Institute, Shenyang, China
  6. 6Second Hospital Tianjin Medical University, Tianjin, China
  7. 7Sun Yat-sen University, Guangzhou, China
  8. 8BeiGene (Beijing) Co., Ltd., Beijing, China
  9. 9West China Hospital, Sichuan University, Changdu, China


Background Tislelizumab, an anti-PD-1 monoclonal antibody, demonstrated efficacy as monotherapy in patients with previously treated PD-L1+ urothelial carcinoma (UC) during a phase 2 study (NCT04004221). Here, gene expression profiles correlating with response and resistance to tislelizumab treatment are reported.

Methods Gene expression profiling (GEP) was conducted on baseline tumor samples from 100 Chinese patients with UC enrolled in the phase 2 tislelizumab study using a 1,392-gene panel by HTG EdgeSeq. Gene Signature (GS) scores were calculated using the Gene Set Variation Analysis package. Differential gene expression (DEG) analysis was performed between responders and non-responders using the Wilcoxon test; survival was evaluated using the Cox proportional hazards model and the odds of tumor response for subgroup analysis was estimated by logistic regression.

Results Of patients with available confirmed response results (n=85), DEG analysis found that responders had significantly higher T-cell GS (CD3D, CD3E, CD3G, CD6, SH2D1A, TRAT1) (P=0.04) and MHC I GS (HLA-A, TAP1) (P=0.05), respectively. Using median GS scores as a cutoff, improvement in overall survival (OS) was observed in T-cell–high versus T-cell–low groups (P=0.01) and a trend of longer OS was seen between MHC I–high versus MHC I–low groups. Patients in T-cell and MHC I–double-high subgroups showed further improvement in clinical efficacy (40% objective response rate [ORR], 5.26 month median progression-free survival [PFS], and 15.2 month median OS) than other subgroups (table 1). In addition to immune-related genes in the microenvironment, DEG analysis also revealed that tumor-related genes were highly expressed in non-responders, such as intrinsic genes related to angiogenesis (VEGFA [P=0.07], KDR [P=0.07]), the mTOR pathway (MTOR [P=0.015]), and DNA damage repair (REV3L [P=0.007]). MTOR and REV3L were associated with shorter PFS (P=0.02; P=0.003) and OS (P=0.03; P =0.008), respectively.

Abstract 78 Table 1

T-cell and MHC I gene signatures associated with clinical efficacy of tislelizumab in patients with UC

Conclusions By using GEP, T-cell and MHC I GS were identified as potentially predictive biomarkers of response to tislelizumab monotherapy in PD-L1+ UC in this retrospective analysis. By combining these two GS scores, patients with optimal efficacy responses could be identified. Conversely, high expression of tumor intrinsic genes related to angiogenesis and the mTOR pathway may indicate resistance and suggest potential future drug combinations for these patients. Both findings warrant further validation in a phase 3 study (NCT03967977).

Acknowledgements Editorial assistance was provided by Stephan Lindsey, PhD, and Elizabeth Hermans, PhD (OPEN Health Medical Communications, Chicago. IL), and funded by the study sponsor.

Trial Registration CTR20170071

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See:

Statistics from

Request Permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.