NL-201 Monotherapy and in Combination With Pembrolizumab in Patients With Relapsed or Refractory Cancer

Patients will have tests and exams to see if they are eligible for the clinical trial. Parts 1 and 2 If eligible, the patient will receive NL-201 treatment by vein. Tumor response to treatment will be assessed every 6 weeks for 12 weeks, and every 12 weeks thereafter until disease progression. Patients will be able to receive study treatment as long as it is tolerated and there is evidence of clinical benefit. Safety follow-up will occur within 7 days after the last dose of NL-201. Patients will then enter long-term follow-up until starting a subsequent therapy. In Part 1, there will be backfill cohorts at certain DMC-cleared dose levels and schedules to collect PK, PD and response data in certain tumor types or to explore additional pre-medication regimens. Parts 3 and 4 If eligible, the patient will receive NL-201 and pembrolizumab treatment by vein. Tumor response to treatment will be assessed every 6 weeks for 12 weeks, and every 12 weeks thereafter until disease progression. Patients will be able to receive study treatments as long as they are tolerated and there is evidence of clinical benefit. Safety follow-up will occur within 7 days after the last dose of investigational product. Patients will then enter long-term follow-up until starting a subsequent therapy.