AACR moderator Marina Garassino, MD, of the University of Chicago, commented on the potential utility of sintilimab and tislelizumab, another checkpoint inhibitor that was evaluated in NSCLC in the RATIONALE 303 trial (AACR 2021, Abstract CT039). Dr. Garassino observed that both drugs have demonstrated superiority to docetaxel as second-line therapy in NSCLC.
Although there have been no head-to-head trials, sintilimab and tislelizumab appear to be very similar to the already approved immune checkpoint inhibitors, which are currently being used as first-line treatment.
“That similarity would make them inappropriate for second-line treatment, except in countries where immune checkpoint inhibitors are not yet approved for first-line therapy,” Dr. Garassino noted.
When asked to comment on the higher treatment-related death rate observed with sintilimab, Dr. Garassino said, “We need to remember that these drugs were developed in China with a population that may have a side effect profile differing from that of a Western population. Also, we are very familiar with this class of drugs and know how to treat their side effects. Similar drugs but different populations and different trials, so it’s very hard to judge.”
Dr. Garassino speculated that with the “super expensive” price tags on the new checkpoint inhibitors, having additional agents that could provide choice and drive prices down would be welcome.
ORIENT-3 was funded by Innovent Biologics and Eli Lilly. Dr. Shi disclosed consultancy for Innovent Biologics. Dr. Garassino disclosed relationships with Eli Lilly, AstraZeneca, Novartis, and several other companies, not including Innovent Biologics.