Dexamethasone Valerate

The main purpose of this study is to find out whether inobrodib, when given with pomalidomide and dexamethasone, works better than standard treatment for people whose multiple myeloma has come back or has not improved after previous treatment. The study will look at how long people taking part in the study ("Participants") live without their myeloma getting worse, and how many people's myeloma improves (responds) following treatment.
The study will also look at how long participants live overall, how quickly treatment works, how long the response lasts, whether very small amounts of myeloma can still be found after a good response, quality of life, side effects, and the amount of inobrodib in the blood.
Participants receive treatment in 28-day cycles. One group receives inobrodib by mouth twice a day for 4 days, followed by 3 days without inobrodib each week; pomalidomide by mouth once a day on Days 1 to 21 of each cycle; and dexamethasone once each week.
The other group receives 1 standard treatment chosen by the study doctor from the following treatment options: daratumumab, pomalidomide, and dexamethasone; elotuzumab, pomalidomide, and dexamethasone; or carfilzomib and dexamethasone. Some standard treatments are given by injection or infusion at the study site. Other medicines, such as tablets or capsules, may be taken by mouth as instructed by the study team.
Study checks include questions about symptoms and side effects, review of other medicines, physical checks, blood pressure and other vital sign checks, heart tracing tests, blood and urine tests, scans where needed, bone marrow samples, and questionnaires about symptoms and daily life. Participants in the inobrodib group will have extra blood samples to measure the amount of inobrodib in the blood. Some participants may also have extra research blood samples at selected visits.

Background:
Secondary central nervous system lymphoma (sCNSL) is cancer that has spread to the central nervous system. Most drugs used to treat it do not cross the blood-brain barrier. This makes it hard to treat. Researchers hope that a new combination of drugs may be able to help.
Objective:
To find a better way to treat sCNSL.
Eligibility:
People ages 18 and older with sCNSL
Design:
Participants will be screened with:
* Medical history
* Physical exam
* Blood, urine, and heart tests
* Eye exam
* Tissue or tumor biopsy
* Collection of cerebrospinal fluid
* CT, PET, and MRI scans: Participants will like in a machine that takes pictures of the body.
* Bone marrow aspirations or biopsies: A needle will be inserted into the participant s hipbone. The needle will remove a small amount of marrow.
Participants will take the study drugs in 21-day cycles. They will take some drugs by mouth. They will take others through a catheter: A small tube will be inserted into a vein in the arm, neck, or chest. They may have drugs given through a catheter placed through the brain or injected into the spinal canal.
Participants will have regular visits during the study. These will include repeats of the screening test. They may also provide a saliva sample or have a cheek swab.
Participants will have up to 4 treatment cycles.
Participants will have a follow-up visit 30 days after their last treatment dose. Then they will have visits every 3-6 months for 3 years and then yearly....