Good morning, @anitasharma
It sounds like your husband is receiving Venetoclax and Vidaza (azacitidine) injections. According to a quick search in American Society of Hematology, this combination of drugs has been an effective salvage regimen for people with relapsing T-ALL. https://ashpublications.org/blood/article/142/Supplement%201/1501/501396/Venetoclax-Combined-with-Azacitidine-Was-Effective

I’ve been looking for a few more possible clinical trials for you. I did come up with this link from the Leukemia Research Foundation. They have a great deal of information on searching for clinical trials, financial aid, etc.
Here’s the website…there are several links included it their article:
Leukemia research foundation.
https://leukemiarf.org/clinical-trials/find-a-clinical-trial/
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Another article that may be helpful?
Developing Targeted Therapies for T Cell Acute Lymphoblastic Leukemia/Lymphoma
https://pmc.ncbi.nlm.nih.gov/articles/PMC11748120/
Dearheart, I’m sure this is feeling so overwhelming and surreal…hoping this had all been behind your family now. But these relapses can happen and your husband’s doctors are meeting the challenges. I’m sending prayers for continued success in your husband’s treatments and for you to remain strong and positive! Your husband has a powerful support system. ☺️