Can vitamin a derivative revive immune therapy for breast cancer?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * ECOG Performance Status of 0, 1, or 2 * Metastatic or locally advanced, histologically confirmed luminal breast cancer (defined as: ER positive when immunohistochemistry shows \>1% positive tumor cells, PR positive when \>1% tumor cells are positive, and HER2 negative when scored as 0-1+ or when HER2 2+ shows no amplification by FISH or CISH) or triple negative breast cancer (defined as: ER negative when immunohistochemistry shows \<1% positive tumor cells, PR negative when \<1% tumor cells are positive, and HER2 negative when scored as 0-1+ or when HER2 2+ shows no amplification by FISH or CISH). * Radiologic/objective evidence of recurrence or disease progression after immunotherapy (combined with targeted therapy or chemo ) for metastatic breast cancer (MBC) * Adequate hematologic and end-organ function, laboratory test results, obtained within 14 days prior to initiation of study treatment. For women of childbearing potential: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraceptive measures as outlined for each specific treatment arm * Measurable disease according to Response Evaluation Criteria in Solid Tumors v1.1 (RECIST v1.1) * have the cognitive ability to understand the protocol and be willing to participate and to be followed up. Exclusion Criteria: * Symptomatic, untreated, or actively progressing CNS metastases * Active or history of autoimmune disease or immune deficiency * Significant cardiovascular disease * History of malignancy other than breast cancer within 5 years prior to screening, with the exception of those with a negligible risk of metastasis or death * Treatment with chemotherapy, radiotherapy, immunotherapy or surgery (outpatient clinic surgery excluded) within 3 weeks prior to initiation of study treatment. * Pregnancy or breastfeeding, or intention of becoming pregnant during the study * History of allergies to the drug components of this trial * History of eosinophilosis or mastocytosis * Patients who have been using oral steroid hormones for a long time will need to stop for 4 weeks if they have used them occasionally in the past