We performed a prospective immunohistochemical analysis of lymphocyte activation gene 3 (LAG3) for 430 consecutive patients with advanced gastrointestinal, genitourinary, or rare cancers between June 2012 and March 2016. Most patients (428/430, 99.5%) were evaluable for LAG3 expression by immunohistochemistry. In total, 18.5% (79/428) of the evaluated cancers expressed LAG3, including pancreatic cancer (33.3%, 2/6), gastric cancer (24.7%, 21/85), colorectal cancer (23.6%, 48/203), melanoma (12.5%, 1/8), genitourinary cancer (9.5%, 4/46), biliary tract cancer (6.3%, 1/16), and sarcoma (5.4%, 2/37), but not miscellaneous (0.0%, 0/14) or hepatocellular (0.0%, 0/15) cancer. Among 149 metastatic colorectal cancer patients, there was no statistically significant difference in sex, age, primary tumor site, pathologic differentiation, KRAS and NRAS status, BRAF status, and microsatellite instability according to LAG3 status (expressed vs. nonexpressed). Among 53 metastatic gastric cancer patients, LAG3 was only significantly associated with Epstein Barr virus status (P=0.042). Our results add to the emerging literature on LAG3 expression in various cancer types and support the need for extended clinical exploration of this target for immunotherapy.
Bibliographical noteFunding Information:
grant from the 20 by 20 Project of Samsung Medical Center (GF01140111).
Supported by funding from the Korean Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea (HI16C1990, HI14C2188). Support was also provided by a
Supported by funding from the Korean Health Technology R and D Project, Ministry of Health &Welfare, Republic of Korea (HI16C1990, HI14C2188). Support was also provided by a grant from the 20 by 20 Project of Samsung Medical Center (GF01140111). All authors have declared that there are no financial conflicts of interest with regard to this work.
© 2019 Lippincott Williams and Wilkins. All rights reserved.
- solid cancer