Method of inhibiting constitutively active phosphorylated FLT3 kinase

1. A method of inhibiting or reducing deregulated FLT3 tyrosine kinase activity or expression in a subject with a proliferative disease which comprises administering to the subject having or suspected to have the proliferative disease, a therapeutically or prophylactically effective amount of the compound of Formula I:

or a pharmaceutically acceptable salt or solvate thereof, wherein the proliferative disease is selected from at least one of a leukemia, myeloma, myeloproliferative disease, myelodysplastic syndrome, idiopathic hypereosinophilic syndrome (HES), bladder cancer, breast cancer, cervical cancer, CNS cancer, colon cancer, esophageal cancer, head and neck cancer, liver cancer, lung cancer, nasopharyngeal cancer, neuroendocrine cancer, ovarian cancer, pancreatic cancer, prostate cancer, renal cancer, salivary gland cancer, small cell lung cancer, skin cancer, stomach cancer, testicular cancer, thyroid cancer, uterine cancer, and hematologic malignancy.

2. The method of claim 1 , wherein the therapeutically or prophylactically effective amounts are from about 15 to 500, 25 to 450, 50 to 400, 100 to 350, 150 to 300, 200 to 250, 15, 25, 50, 75, 100, 150, 200, 250, 300, 400, 450, or 500 mg per day.

3. The method of claim 1 , wherein the compound is administered at least one of continuously, intermittently, systemically, or locally.

4. The method of claim 1 , wherein deregulated FLT3 is defined further as a mutated FLT3 is constitutively active, or is at least one of FLT3-ITD or FLT3-TKD.

5. The method of claim 1 , wherein the compound is administered orally, intravenously, or intraperitoneally.

6. The method of claim 1 , wherein the Crenolanib is at least one of Crenolanib Besylate, Crenolanib Phosphate, Crenolanib Lactate, Crenolanib Hydrochloride, Crenolanib Citrate, Crenolanib Acetate, Crenolanib Toluenesulphonate and Crenolanib Succinate Crenolanib Besylate.

7. The method of claim 1 , wherein the therapeutically or prophylactically effective amount of compound is administered daily for as long as the subject is in need of treatment for the proliferative disease.

8. The method of claim 1 , wherein the compound is provided at least one of: (1) sequentially or concomitantly, with another pharmaceutical agent in a newly diagnosed proliferative disease subject, to maintain remission of an existing subject, or a relapsed/refractory proliferative disease subject; (2) as a single agent or in combination with another pharmaceutical agent in a newly diagnosed proliferative disease subject, to maintain remission, or a relapsed/refractory proliferative disease subject; (3) as a single agent or in combination with another pharmaceutical agent in a newly diagnosed proliferative disease pediatric subject, to maintain remission, or a relapsed/refractory proliferative disease pediatric.

9. The method of claim 1 , further comprising the step of determining if the subject is relapsed/refractory to a prior FLT3 tyrosine kinase inhibitor.

10. A method for treating a subject with a proliferative disease comprising:

administering to the subject in need of such treatment a therapeutically effective amount of Crenolanib or a salt thereof, wherein the cell proliferative disorder is characterized by deregulated FLT3 receptor tyrosine kinase activity, proliferative disease is selected from at least one of a leukemia, myeloma, myeloproliferative disease, myelodysplastic syndrome, idiopathic hypereosinophilic syndrome (HES), bladder cancer, breast cancer, cervical cancer, CNS cancer, colon cancer, esophageal cancer, head and neck cancer, liver cancer, lung cancer, nasopharyngeal cancer, neuroendocrine cancer, ovarian cancer, pancreatic cancer, prostate cancer, renal cancer, salivary gland cancer, small cell lung cancer, skin cancer, stomach cancer, testicular cancer, thyroid cancer, uterine cancer, and hematologic malignancy, and wherein the subject is refractory to at least one other tyrosine kinase inhibitor.

11. The method of claim 10 , wherein the compound is administered orally, intravenously, or intraperitoneally.

12. The method of claim 10 , wherein the Crenolanib is at least one of Crenolanib Besylate, Crenolanib Phosphate, Crenolanib Lactate, Crenolanib Hydrochloride, Crenolanib Citrate, Crenolanib Acetate, Crenolanib Touluenesulphonate and Crenolanib Succinate Crenolanib Besylate.

13. The method of claim 10 , wherein the Crenolanib is provided at least one of: (1) sequentially or concomitantly, with chemotherapy, radiotherapy, or surgery in a newly diagnosed proliferative disease, to maintain remission, or a relapsed/refractory proliferative disease; (2) as a single agent or in combination with chemotherapy, radiotherapy or surgery for treatment of pediatric subject with the proliferative disease; (3) as a single agent to at least one of post standard induction therapy, or high dose induction therapy, in newly diagnosed proliferative disease; or (4) as a single agent in treatment of subjects with the proliferative disease that is either refractory to, or has relapsed after, standard or high dose chemotherapy, radiotherapy or surgery.

14. The method of claim 10 , wherein the method further comprises the step of identifying a subject in need of treatment for a proliferative disease prior to treatment.

15. A method for specifically inhibiting a deregulated receptor tyrosine kinase comprising:

obtaining a subject sample and determining which receptor tyrosine kinases are deregulated; and

administering to a mammal in need of such treatment a therapeutically effective amount of Crenolanib or a salt thereof, wherein the deregulated receptor tyrosine kinase is a FLT3 receptor tyrosine kinase, wherein the proliferative disease is selected from at least one of a leukemia, myeloma, myeloproliferative disease, myelodysplastic syndrome, idiopathic hypereosinophilic syndrome (HES), bladder cancer, breast cancer, cervical cancer, CNS cancer, colon cancer, esophageal cancer, head and neck cancer, liver cancer, lung cancer, nasopharyngeal cancer, neuroendocrine cancer, ovarian cancer, pancreatic cancer, prostate cancer, renal cancer, salivary gland cancer, small cell lung cancer, skin cancer, stomach cancer, testicular cancer, thyroid cancer, uterine cancer, and hematologic malignancy.

16. The method of claim 15 , wherein the therapeutically and prophylactically effective amounts are from about 15 to 500 mg per day.

17. The method of claim 15 , wherein the compound is administered at least one of continuously, intermittently, systemically, or locally.

18. The method of claim 15 , wherein deregulated FLT3 is defined further as a mutated FLT3 is constitutively active or is at least one of FLT3-ITD or FLT3-TKD.

19. The method of claim 15 , wherein the compound is administered orally, intravenously, or intraperitoneally.

20. The method of claim 15 , wherein the Crenolanib is at least one of Crenolanib Besylate, Crenolanib Phosphate, Crenolanib Lactate, Crenolanib Hydrochloride, Crenolanib Citrate, Crenolanib Acetate, Crenolanib Touluenesulphonate and Crenolanib Succinate Crenolanib Besylate.

21. A method for treating a subject with a hematological malignancy comprising:

obtaining a sample suspected of having cancer from the subject;

determining if the subject that has become resistant to prior FLT3 protein tyrosine kinase inhibition; and

administering a therapeutically effective amount of Crenolanib or a salt thereof to overcome the resistance to the prior FLT 3 protein tyrosine kinase inhibition.