RADIOLABELED LIPOSOMES AND METHODS OF USE THEREOF

1 . A method of treating a disease or disorder in a subject in need thereof, comprising administering a therapeutically effective amount of a radiolabeled liposome comprising a liposome and a compound of Formula I:

or a pharmaceutically acceptable salt thereof, wherein:

M is 99m Tc, 186 Re, 188 Re, or a combination thereof;

X is NR 1 ;

R 1 is CH 2 CH 2 NEt 2 or CH 2 CH 2 CH 2 CH 3 ; and

R 2 is CH 2 CH 2 N(CH 2 CH 2 SH)(CH 2 CH 2 NEt 2 ) or CH 2 CH 2 N(CH 2 CH 2 SH)(CH 2 CH 2 CH 2 CH 3 ).

2 . The method of claim 1 , wherein R 1 is CH 2 CH 2 NEt 2 and R 2 is CH 2 CH 2 N(CH 2 CH 2 SH)(CH 2 CH 2 NEt 2 ).

3 . The method of claim 1 , wherein R 1 is CH 2 CH 2 CH 2 CH 3 and R 2 is CH 2 CH 2 N(CH 2 CH 2 SH)(CH 2 CH 2 CH 2 CH 3 ).

4 . The method of claim 1 wherein M is 186 Re.

5 . The method of claim 1 wherein the compound is incorporated or attached to the liposome.

6 . The method of claim 1 , wherein the liposome comprises a lipid.

7 . The method of claim 1 , wherein the liposome comprises a phospholipid.

8 . The method of claim 1 , wherein the liposome comprises a cholesterol or a cholesterol analogue.

9 . The method of claim 8 , wherein the liposome comprises distearoyl phosphatidylcholine.

10 . The method of claim 1 wherein the radiolabeled liposome comprises from about 0.01 mCi to about 400 mCi of the compound per 50 mg of lipid used to prepare the liposome.

11 . The method of claim 1 wherein the liposome further comprises a chemotherapeutic agent, an antibiotic agent, or a treatment molecule, wherein the chemotherapeutic agent, the antibiotic agent, or the treatment molecule is incorporated or attached to the liposome.

12 . The method of claim 1 wherein the disease or disorder is cancer.

13 . The method of claim 12 , wherein the cancer is selected from lung cancer, breast cancer, colorectal cancer, prostate cancer, skin cancer, stomach cancer, bladder cancer, liver cancer, leukemia, lymphoma, ovarian cancer, pancreatic cancer, hepatocellular carcinoma, melanoma, sarcoma, head and neck cancer, glioma, glioblastoma, medulloblastoma, ependymoma, diffuse intrinsic pontine glioma, leptomeningeal metastases, and pediatric high-grade glioma.

14 . The method of claim 13 , wherein the cancer is glioblastoma.

15 . The method of claim 13 , wherein the cancer is leptomeningeal metastases.

16 . The method of claim 1 wherein the radiolabeled liposome is administered via infusion of an infusate comprising the radiolabeled liposome.

17 . The method of claim 1 wherein the radiolabeled liposome is administered via convection-enhanced delivery.

18 . The method of claim 17 , wherein the convection-enhanced delivery comprises administration of the radiolabeled liposome via one or more catheters.

19 . The method of claim 16 wherein the infusate is administered with a maximum flow rate of from about 1 μL min −1 to about 50 μL min −1 .

20 . The method of claim 1 , wherein the amount of radioactivity delivered by the radiolabeled liposome is from about 0.1 mCi to about 50 mCi.

21 . The method of claim 16 , wherein the volume of infusate is from about 0.1 mL to about 25 mL.

22 . The method of claim 16 , wherein the amount of radioactivity delivered by the radiolabeled liposome per volume of infusate is from about 0.1 mCi mL −1 to about 50 mCi mL −1 .

23 . The method of claim 1 wherein the method further comprises imaging the radiolabeled liposome concomitant with administration.

24 . The method of claim 1 wherein the method further comprises imaging the radiolabeled liposome subsequent to administration.