Essential Thrombocythemia Kidney Stones.

Hello Team, I am seeking out an expert opinion regarding my sister-in-law’s health condition. She had asthma in past and was allergic to dust. But then in the recent past she was diagnosed with “essential thrombocythemia” wherein her platelet count reaching 14 Lakh mark. In such a condition, a doctor prescribed Imatinib 400 tablet (OD). We were fearing as this is a tablet to fight varieties of cancer. Upon asking as to why this medicine was prescribed, doctor said that he is doubting weather this increase in platelet count is related to myeloproliferative neoplasms cancer or acute leukaemia, so he prescribed this medication. Now last week she was diagnosed with stones in both kidney and we are suspecting this medicine to be the cause of that. She is getting married in April and we have no clue where to go and whom to ask for help. I am sharing all the recent reports. Kindly guide us in right direction. Do we really need to take this medication ? Is she developing cancer ?