Thanks for writing to us.
Given the history, it is likely that the tumor
in the stomach is a lymphoma/MALToma. Since there are 2 coexisting tumors, the prognosis definitely is poor.
As far as the Myeloma
is concerned, the prognosis can be ascertained by several lab parameters like chromosomal abnormalities, beta 2 microglobulin levels, increased calcium levels etc but also by other issues like age, her medical condition and the grade of her myeloma.
On an average, survival for myeloma patients will vary from 11 months to 3 years. Given that your mom has 2 tumours, at this stage, it would be best if we take a endoscopic guided biopsy
to know the nature of the 2nd tumor and decide which drugs /treatment would be best for her.
Hope that helps