The answer to this depends on what treatments are in place, and how your father responds to the treatments. Without this information as well as his labs, it's impossible to speculate.
However, I sense you are aware that what you've described is a very grave diagnosis, and that a "cure" is highly unlikley. At this time, I would advise my own family to start considering the patient's quality of life, finalizing any plans, and discussing at what point the suffering should be allowed to find it's natural end.
I'm so sorry to hear about this -- you have my deep sympathies.
How long stage 3 multiple myeloma patients survive??
I am not a doctor. However, I found this answer while talking with a doctor who is treating a relative of mine with MM stage 3. He is 69 years old and had gone a bypass surgery recently. I have asked the DOC about the life expectancy of my patient.
The formula of life expectancy of my patient as per DOC is-
only aid and considering of the time available of an oncological patient. It multiplies the remaining days according to the age of the person, by each one of the 5 important risk factors, this mathematically would be:
Time of Life = F1 * F2 * F3 * F4 * F5.
F1 = Age
1 - 19 = 25000
20 - 39 = 15000
40 - 59 = 5000
60 - 79 = 3000
80 - 99 = 1000
F2 = Cancer Estage
0 = 1
A or 1 = 0.80
B or 2 = 0.70
C or 3= 0.60
D or 4 = 0.50
F3 = Life style
EXERCISE + GOOD NUTRITION + HEALTHY LIFE = 1
EXERCISE + GOOD NUTRITION = 0.80
SEDENTARY = 0.70
SEDENTARY + STRESS = 0.60
SEDENTARY + STRESS + BAD NUTRITION = 0.50
F4 = SANGUINEOUS GROUP
B (RH + Ó -) = 0.80
O (RH + Ó -) = 0.70
AB (RH + Ó -) = 0.60
A (RH + Ó -) = 0.50
F5 = FAMILIAR RISKS
0 FAMILIAR CASES (FATHER - MOTHER) = 1
1 FAMILIAR CASES (FATHER - MOTHER) = 0.80
BOTH FAMILIAR CASES (FATHER - MOTHER) = 0.70
BOTH FAMILIAR CASES (FATHER - MOTHER) TO DRINK ALCOHOL = 0.60
BOTH FAMILIAR CASES (FATHER - MOTHER) TO DRINK ALCOHOL And TO SMOKE = 0.50