Children's National

Participants must meet all of the inclusion criteria below. Additional criteria are specified in the protocol amendment (individual addenda) to which the participant will enroll. - Have either measurable or evaluable disease using standard techniques by the Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST 1.1). - The participant has a Lansky (<16 years of age) or Karnofsky (≥16 years of age) performance score of at least 50. - Participants must have discontinued all previous treatments for cancer or investigational agents greater than or equal to (≥)7 days after the last dose and must have recovered from clinically significant side effects. - The participant has adequate hematologic and organ function. - Female participants of childbearing potential must have a negative urine or serum pregnancy test within 7 days prior to first dose. - Both female and male participants of childbearing potential must agree to use highly effective contraceptive precautions during the trial and for at least 3 months following the last dose of study drug. Participants will be ineligible if they meet any of the

below. Additional criteria are specified in the protocol amendment to which the participant will enroll. - Participants with severe and/or uncontrolled concurrent medical disease or psychiatric illness/social situation that, in the opinion of the investigator, could cause unacceptable safety risks or compromise compliance with the protocol. - Participants who have active infections requiring therapy. - Participants who have had allogeneic bone marrow or solid organ transplant. - Participants who have had, or are planning to have, certain invasive procedures. - Female participants who are pregnant or breastfeeding.