Clinical Trial of Radiotherapy in Treating Primary Hepatocellular Carcinoma

Primary hepatocellular carcinoma (HCC) is the sixth most malignant tumor in the world. In 2015, 466,000 people had been diagnosed as HCC in China, accounting more than half of the total incidence in the world; and 422,000 people died, making the HCC as the second reason for cancer related deaths in this country. Although many advances have been made in recent years in treatments such as Radiofrequency Ablation (RFA) and transarterial chemoembolization (TACE), the prognosis of patients with HCC is still poor. As a result, the prevention and treatments of HCC in China are still urgently needed to improve.

Being one of the three major treatments of cancer, radiotherapy has been used for HCC in very early times. In the pioneering days, however; whole-liver radiation was impossible to give lethal dose for cancer tissue due to the high risk of radiation induced liver disease (RILD) and even liver failure, which might lead to death of patients. Consequently, radiotherapy has long failed to play a major role in the treatment of liver cancer. But things are likely to be changed. In recent years, many research teams have applied precise external radiotherapy, such as intensity modulated radiation therapy (IMRT) and stereotactic body radiation therapy (SBRT), to the treatment of liver cancer, and has achieved good results. Despite of this, many guidelines still do not recommend radiotherapy as a first-line treatment for early and mid-term liver cancer due to the lack of high level of evidence from good clinical trials proving the effectiveness of SBRT/IMRT and other new radiotherapy techniques in the treatment of HCC.

In the investigator's previous clinical work, the investigators found that precise external radiotherapy such as SBRT and IMRT is effective in treating primary liver cancer. For example, patients with early stage HCC could achieve complete response (CR) after SBRT, and patients with local advanced HCC could be observed a significant reduction in the size of lesions and obvious improvement in the symptoms. Considering the poor prognosis of HCC and the shortcomings of surgery, RFA and TACE, the investigators then decided to carry out this multi-centered clinical trial of radiotherapy in HCC with the purpose of obtaining true and reliable clinical data and evidence, and focused on the following two questions: (1) whether radiotherapy, combined or not combined with TACE, could be a radical and first-line treatment for inoperable patients with early stage HCC; (2) what is the optimal sequence and timing of the combination of radiotherapy and TACE for patients with lesions adjacent to organs at risk and radical doses cannot be given. It is foreseeable that this clinical trial will change clinicians' understanding of the value of radiotherapy in the treatment of liver cancer, improve its status and even lead to revision of related guidelines/norms, and exert a far-reaching impact on the prognosis of patients with HCC.

The subjects who were pathologically or clinically diagnosed as primary liver cancer were grouped according to physical status, size/location/number of tumor, vascular invasion, extrahepatic metastasis, the relationship with organ at risk (OAR), and liver function. Then the subjects received IMRT, SBRT, TACE or surgery, and were followed up until the completion of treatment, the emergence of intolerance of toxicity, or the withdrawal of the trial.

Treatment methods: