Snoopy - Arsenicum would only be correct if it is homeopathic to the WHOLE person!! We don't give a remedy by the disease name but for the person.
Commonsense says that in an official proving situation a person would only come up with leukeamia if they were susceptible to it anyway. I do realise that Murphy does have this rubric but I would always prefer to use a more general one.
From the Millenium Edition of the Complete
Unassigned - Generals
LEUKEMIA (45)
1 acet-ac, 1 acon, 2 aran, 1 ars, 2 ars-i, 1 bar-i, 1 bar-m, 1 benz, 1 bry, 2 calc, 2 calc-p, 1 carb-v, 2 carbn-s, 1 cean, 2 chin, 1 chin-s, 1 coca, 1 con, 1 cortiso, 1 crot-h, 2 ferr-pic, 1 ip, 1 kali-hp, 2 kali-p, 1 merc, 3 NAT-AR, 2 nat-m, 2 nat-p, 3 NAT-S, 1 nux-v, 1 op, 1 phos, 2 pic-ac, 1 querc, 1 rad-br, 1 rib-ac, 1 saroth, 1 succ, 1 sul-ac, 1 sulfa, 1 sulph, 1 syph, 1 thuj, 1 tub, 2 x-ray

Re potenising the blood, this is isopathy rather than homeopathy and is only done in a last resort situation when homeopathy has failed.

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RSHom - Registered Homeopath