Abstract
e18003 Background: Treatment options for advanced cervical cancer (ACC) are limited and patients experiencing recurrence after first-line chemotherapy and bevacizumab have a poor prognosis. Checkpoint inhibitors targeting the PD-1/PD-L1 are promising treatment option. However, related genomic biomarker study is rare reported in ACC. Methods: We prospectively enrolled 102 pts with ACC. Tumor and plasma samples were obtained to analysis genomic profiles. DNA was sequenced by target-capture deep sequencing with the pan-cancer panel. TMB of tissue (tTMB) and blood (bTMB) analysis interrogated single nucleotide variants, small insertion and deletion. PD-L1 expression was evaluated in tumor specimens by immunohistochemistry (IHC) using a combined-positive-score (CPS) cutoff of ≥1. Results: The median age of enrolled pts was 63 yrs, and most (84.3 %, 86/102 pts) weresquamous carcinoma. A total of 93 tissues and 96 plasma were collected from 102 pts. The most frequently mutated genes were PIK3CA (40.9%, 38/93 pts), KMT2D (35.5%, 33/93 pts), and KMT2C (28.0%, 26/93 pts) in tissues. 80% (77/96 pts) of plasma was detected positive, with PIK3CA (23.4%, 18/77 pts), KMT2D (20.8%, 16/77 pts), KMT2C (20.8%, 17/77 pts) mutant frequently. Among 87 pts with paired samples, at least a tumor-derived mutation was detected in 35 (40.2%)plasma. Median of tTMB was 11.9 mut/Mb, and 45% pts were TMB-H. Significant correlation was found between tTMB and bTMB (Pearson r = 0.39, P = 0.001). Higher tTMB was identified in KMT2D- or KMT2C-mut pts (P = 0.002 or P = 0.01, respectively). tTMB showed no relation with clinic characteristics, including pathological subtype, FIGO stage, and status of distant metastasis. PD-L1 expression (CPS≥1) was identified in 53 pts (93 %, 53/57) and mutually independent with TMB status. Conclusions: Molecular profiles and TMB in plama showed high consistence with that in tissue. Prospective clinical trial is ongoing to determine the genomic biomarkers and the PD-L1 expression as predictive factors for the ICI efficacy in ACC (ChiCTR1900023015).
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