Dasatinib and leg pain

Hi! My son has been on Dasatinib 70mg for the 5 months. His Q-PCR reading after 3 months was 0.43% (it had gone up marginally to 1.8% with imatinib which is why we shifted to Dasa). Over the last few days he has been complaining of pain in his left leg (calf and shin). Have any of you come across this? I wonder if this is Dasa. side effect or something totally unrelated. We might suspend Dasa for a few days to check but looking for some feedback here