Toxicity
Dr. Solomon noted that lorlatinib “does have a different toxicity profile, compared to other ALK inhibitors.” Specifically, lorlatinib is associated with hypercholesterolemia and hypertriglyceridemia, which have not been seen with other ALK inhibitors.
Lorlatinib is also associated with neurocognitive problems, including inattention, memory impairment, and mild confusion. Mood effects include emotional lability – “someone watching a movie might burst into tears when they wouldn’t have otherwise,” Dr. Solomon said – as well as anxiety and depression.
“So it’s important to tell not just the patient but their family about these things so that they identify when [the events] happen,” Dr. Solomon said. “That’s key because [the events are] completely reversible when you stop the drug. With dose interruption, those effects will resolve.”
Other adverse events that were more common with lorlatinib (a 10% or greater difference in frequency from crizotinib) included edema, weight gain, and peripheral neuropathy. Diarrhea, nausea, fatigue, vision disorders, constipation, and increased liver enzymes were more common with crizotinib. Grade 3-4 adverse events led to discontinuation in fewer than 10% of patients in each arm.
The study was funded by Pfizer, and the investigators included employees. Dr. Solomon is an adviser for Pfizer and other companies, and Dr. Lovly’s industry ties included being both an advisor and speaker for Pfizer.
SOURCE: Solomon B et al. ESMO 2020, Abstract LBA2.