Safety and antitumor activity of the anti–PD-1 antibody pembrolizumab in patients with advanced, PD-L1–positive papillary or follicular thyroid cancer

Janice M. MehnertEmail author,
Andrea Varga,
Marcia S. Brose,
Rahul R. Aggarwal,
Chia-Chi Lin,
Amy Prawira,
Filippo de Braud,
Kenji Tamura,
Toshihiko Doi,
Sarina A. Piha-Paul,
Jill Gilbert,
Sanatan Saraf,
Pradeep Thanigaimani,
Jonathan D. Cheng and
Bhumsuk Keam

BMC Cancer201919:196

https://doi.org/10.1186/s12885-019-5380-3

Received: 22 January 2018
Accepted: 19 February 2019
Published: 4 March 2019

Open Peer Review reports

Abstract

Background

Treatment options for advanced thyroid cancer refractory to standard therapies are limited. The safety and efficacy of pembrolizumab were evaluated in patients with advanced differentiated thyroid cancer expressing programmed death ligand 1 (PD-L1).

Methods

Patients with advanced thyroid cancer were enrolled in the nonrandomized, phase Ib KEYNOTE-028 trial conducted to evaluate safety and antitumor activity of the anti–programmed death 1 (PD-1) antibody pembrolizumab in advanced solid tumors. Key eligibility criteria were advanced papillary or follicular thyroid cancer, failure of standard therapy, and PD-L1 expression in tumor or stroma cells (assessed by immunohistochemistry). Pembrolizumab 10 mg/kg was administered every 2 weeks up to 24 months or until confirmed progression or intolerable toxicity. The primary endpoint was objective response rate (ORR) per Response Evaluation Criteria in Solid Tumors, version 1.1.

Results

Twenty-two patients were enrolled: median age was 61 years; 59% were women; and 68% had papillary carcinoma. Median follow-up was 31 months (range, 7–34 months). Treatment-related adverse events were observed in 18 (82%) patients; those occurring in ≥15% of patients were diarrhea (n = 7) and fatigue (n = 4). One grade ≥ 3 treatment-related adverse event occurred (colitis, grade 3); no treatment-related discontinuations or deaths occurred. Two patients had confirmed partial response, for an ORR of 9% (95% confidence interval [CI], 1–29%); response duration was 8 and 20 months. Median progression-free survival was 7 months (95% CI, 2–14 months); median overall survival was not reached (95% CI, 22 months to not reached).

Conclusions

Results of this phase Ib proof-of-concept study suggest that pembrolizumab has a manageable safety profile and demonstrate evidence of antitumor activity in advanced differentiated thyroid cancer in a minority of patients treated. Further analyses are necessary to confirm these findings.