I personally if it were my child would go to a hematologist and I would do the bone marrow biopsy to rule out leukemias and lymphomas and check for any genetic mutations (which there are many they can find...
I've done a little research on your behalf and I am not seeing anything that links the two diseases. They have different genetic markers all together. The only ways I see that they might be connecte d...
If you believe you may have Polycythemia Vera you need to see a hematologist and numerous tests need to be ran to confirm because there is also a conditioned called secondary polycythemia which is cau sed...