125I粒子近距离植入治疗结直肠癌肝转移的研究进展

Brachytherapy with iodine-125 seeds for hepatocellular carcinoma

¹²⁵I seeds have good physical and radiobiological characteristics. Interstitial brachytherapy has advantages of minimal invasive, precise stereotactic treatment and high local control rate and plays an important role in the treatment of hepatocellular carcinoma (HCC). Brachytherapy with ¹²⁵I seeds has been used in unresectable HCC, HCC with portal vein tumor thrombus, intrahepatic cholangiocarcinoma, hepatic metastases, and some other tumors, providing encouraging survival rates. Radiation-related complications are rare in highly selected patients. In a word, ¹²⁵I brachytherapy is a safe and effective treatment for newly diagnosed or recurrent unresectable intrahepatic malignancies and can provide better survival rates and decent quality of life.

125I radioactive seed interstitial brachytherapy for liver metastases

AIM: To detect the efficacy of ¹²⁵I radioactive seed interstitial brachytherapy for liver metastases.

METHODS: Thirty-two tumors in 24 patients with liver metastases were treated by ¹²⁵I radioactivity seed interstitial brachytherapy. The tumor diameter ranged from 4.5 to 12.8 cm, with an average value of 7.8 cm. The treatment response, local control rate and survival rate were evaluated and adverse events observed.

RESULTS: Complete remission (CR) was achieved in 7 tumors, and partial remission (PR) was achieved in 16 tumors. Five tumors had no remission (NR), and 4 tumors had progressive deterioration (PD). The response rate was 71.9%. The patients were followed up for 7 to 22months (median 16 mo). The local control rate was 65.9%, and total survival rate 70.1%. No serious side effects were observed.

CONCLUSION: Radioactive seed interstitial brachytherapy is an effective form of treatment for patients with liver metastases.

Interstitial implantation of iodine-125 seeds induces apoptosis but inhibits cell proliferation in HCT-116-xenografted tumors in nude mice

AIM: To investigate the effect of interstitial implantation of iodine-125 on the growth of adenocarcinoma of the large intestine and to explore potential mechanisms involved.

METHODS: Nude mice bearing HCT-116-xenografted tumors were randomly divided into two groups (n = 24 each): control group and experimental group. The control group underwent implantation of empty seeds, while the experiment group underwent implantation of iodine-125 seeds (14.8 MBq). On days 7, 14, 21 and 28 after implantation, mice were killed to calculate tumor growth, detect the expression of proliferating cell nuclear antigen (PCNA) in tumor tissue by immunohistochemistry, determine the apoptosis of tumor cells by terminal deoxynucleotidyl transferase dUTP nick-end labeling (TUNEL) assay, and observe the ultrastructural changes of tumor cells by transmission electron microscopy (TEM).

RESULTS: On days 7, 14, 21 and 28 after implantation, both tumor volume and weight were significantly lower in the experiment group than in the control group (tumor volume on day 28: 497.3 mm3 ± 7.8 mm3 vs 947.2 mm3 ± 40.4 mm3, P < 0.01; tumor weight on day 28: 1.131 g ± 0.079 g vs 2.139 g ± 0.094 g, P < 0.01). The reduced rate of tumor growth in the experimental group was higher than that in the control group (on day 28: 47.12% vs 25.77%). The expression of PCNA in the experiment group decreased with time and was significantly lower on day 28 than that in the control group. On day 14, apoptotic bodies began to appear and then gradually increased in number, reaching the peak on day 28.

CONCLUSION: Interstitial implantation of iodine-125 seeds induces apoptosis but inhibits cell proliferation in HCT-116-xenografted tumors in nude mice.