MRD Conversion Rate

Lenalidomide Plus GM-CSF Vaccine (Arm A)

Patients will continue on a standard dose of lenalidomide as a single agent until progression, or treatment limiting toxicity, following enrollment. Patients assigned to vaccine therapy will receive injections on day 14 (+/-3 days) of cycles 1, 2, 3 and 6 from enrollment, and then annually thereafter. Patients will also be administered a placebo prevnar13 vaccination. Placebo will be saline. GM-CSF vaccine: Each vaccination will consist of three total intra-dermal injections, on day 14 of cycles 1, 2, 3, 6 and annually for a minimum of 36 months in the right and left anterior upper thighs, and one in the non-dominant upper arm (unless contraindicated). In the event that the specified limb is contraindicated, the dominant arm may be used. Vaccine injection sites shall be at least 5 cm at needle entry from the nearest neighbor. The approximate volume of each vaccination injection is approximately 0.7-0.8ml. Lenalidomide: Patients will be continued on the same dose of lenalidomide as they were prior to being enrolled in the study. Doses of lenalidomide for investigation can vary from 5-25 mg/day, orally on days 1 - 21 followed by 7 days rest (28 day cycle). Placebo Prevnar13: Saline will be used for placebo. Placebo prevnar will be administered at the same time points as the GM-CSF vaccine or Placebo GM-CSF Vaccine (day 14 of cycles 1, 2, 3, 6 and annually for a minimum of 36 months), but on the opposite arm from GM-CSF vaccine or placebo GM-CSF vaccine.

Lenalidomide Plus GM-CSF Vaccine Plus Prevnar13 (Arm B)

Patients will continue on a standard dose of lenalidomide as a single agent until progression, or treatment limiting toxicity, following enrollment. Patients assigned to vaccine therapy will receive injections on day 14 (+/-3 days) of cycles 1, 2, 3 and 6 from enrollment, and then annually thereafter. Prevnar vaccine will be administered with the GM-CSF vaccine administration. GM-CSF vaccine: Each vaccination will consist of three total intra-dermal injections, on day 14 of cycles 1, 2, 3, 6 and annually for a minimum of 36 months in the right and left anterior upper thighs, and one in the non-dominant upper arm (unless contraindicated). In the event that the specified limb is contraindicated, the dominant arm may be used. Vaccine injection sites shall be at least 5 cm at needle entry from the nearest neighbor. The approximate volume of each vaccination injection is approximately 0.7-0.8ml. Lenalidomide: Patients will be continued on the same dose of lenalidomide as they were prior to being enrolled in the study. Doses of lenalidomide for investigation can vary from 5-25 mg/day, orally on days 1 - 21 followed by 7 days rest (28 day cycle). Prevnar13: Prevnar will be administered at the same time points as the GM-CSF vaccine (day 14 of cycles 1, 2, 3, 6 and annually for a minimum of 36 months), but on the opposite arm from GM-CSF vaccine.

Lenalidomide Only (Arm C)

Patients will continue on a standard dose of lenalidomide as a single agent until progression, or treatment limiting toxicity, following enrollment. Patients will also get placebo GM-CSF vaccine and placebo prevnar13. Placebo will be saline. Lenalidomide: Patients will be continued on the same dose of lenalidomide as they were prior to being enrolled in the study. Doses of lenalidomide for investigation can vary from 5-25 mg/day, orally on days 1 - 21 followed by 7 days rest (28 day cycle). Placebo Prevnar13: Saline will be used for placebo. Placebo prevnar will be administered at the same time points as the GM-CSF vaccine or Placebo GM-CSF Vaccine (day 14 of cycles 1, 2, 3, 6 and annually for a minimum of 36 months), but on the opposite arm from GM-CSF vaccine or placebo GM-CSF vaccine. Placebo GM-CSF Vaccine: Saline will be used for placebo. Each placebo vaccine will consist of three total intra-dermal injections on day 14 of cycles 1, 2, 3, 6 and annually for a minimum of 36 months in the right and left anterior upper thighs, and one in the non-dominant upper arm (unless contraindicated). In the event that the specified limb is contraindicated, the dominant arm may be used. Placebo injection sites shall be at least 5 cm at needle entry from the nearest neighbor. The approximate volume of each injection is approximately 0.7-0.8ml.

Analysis denominator · Participants