Hi @nhlbob “I'm so confused, bewildered and terrified at the moment…” Well of course you, are after getting diagnosed with a blood cancer and having differing opinions for treatment. It pulls the rug right out from under you! I’ve been there so I can truly appreciate what you’re going through.

From what I’m been reading about your disease, immunotherapy, in a combination with chemo, seems to be the predominant treatment along with a Stem Cell Transplant and in some cases, Cart T therapy.
Searching further I did find information that validates what you were told by the MD Anderson doctor regarding Chemo for Mantel Cell Lymphoma. It’s not used as a solo treatment anymore but generally in conjunction with an immunosuppressant targeted to the suppression of B-cells. Which, your cancer is recognized as a subtype of B-cell non-Hodgkin’s Lymphoma. So you’ll most likely be given a drug called Rituximab or Rituxin along with some forms of chemo drugs.

The Lymphoma organization website gives a good overview of lymphoma and treatments. Make sure you look at the menu on the right side of their site as it gives options for areas of interest.
https://lymphoma.org/aboutlymphoma/nhl/mcl/
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I found a little more reading for you in case you’re interested. We have a number of discussions, some older but still germane, regarding mantle cell lymphoma. The last site is a blogpost from Dr Grzegorz Nowakowski, a hematologist at Mayo Clinic.
https://connect.mayoclinic.org/discussion/my-son-was-treated-for-mantle-cell-lymphoma-ending-122014-so-far/
https://connect.mayoclinic.org/discussion/mantle-cell-lymphoma/
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https://connect.mayoclinic.org/blog/hematology/newsfeed-post/putting-the-precision-in-precision-medicine-care-for-non-hodgkins-lymphoma-1/
You mentioned being not being in the US. Will you staying for treatment where you’re currently living?