Hepatitis C virus (HCV) is a major public medical condition. A quarter of infected patients have cirrhosis and associated complications, such as hepatocellular carcinoma. Treatment aims to remove the virus and prevent the development of cirrhosis and its complications. The treatment target for HCV has been identified in terms of a sustained virologic response (SVR), which is the absence of detectable levels of viral RNA in the blood 24 weeks after the end of the drug course. ¹

The prevalence of hepatitis C virus (HCV) infection is the highest in the world in Egypt. It became clear that HCV infection was widespread among Egyptians and that it was the main cause of liver disease in the region. Before the HCV epidemic became evident, schistosomiasis was Egypt’s most significant public health issue. ²

Worldwide, 180 million people develop chronic HCV infections. While genotype 1 accounts for approximately 48% of HCV infections, the distribution of the seven genotypes varies geographically. Genotype 4 infections are around 20% of all HCV infections worldwide but accounts for nearly 93% of all HCV cases in Egypt. ³

Globally, hepatocellular carcinoma (HCC) is known to be a severe malignancy with an approximate incidence of 5.6%. The second most common cause of all cancer-related deaths is also considered. Infection with HCV, studies have indicated that in approximately 30%of patients with chronic hepatitis C, the liver progresses towards cirrhosis of the liver. HCV functions as carcinogenic by many causes, direct viral oncogenic effects, or chronic inflammation and fibrosis. ⁴

The pegylated interferon routine has long been a lonely potent regulation of chronic hepatitis C with moderate efficacy. The first appearance of boceprevir and telaprevir protease inhibitors was considered a significant breakthrough, but the potency of both drugs was limited to genotype 1. Currently, direct antiviral drugs have started a new era to effective control of HCV, undoubtedly following the approval by the FDA of medication that have further lead to a complete removal of HCV. ⁵

Evaluation of HCC prevalence and hazard factors following a sustained virological response (SVR) is necessary to give priority to HCC surveillance patients during the DAA period. Evidence is especially restricted on the HCC risk of presenting SVR among people with superior fibrosis to support the most effective SVR follow-up for HCC. ⁶

Patients with HCV-associated cirrhosis who have been treated with DAAs do not tend to minimize the occurrence of HCC over a limited time. Cirrhotic patients must also be closely monitored during and after antiviral therapy by applying or persevering with HCC monitoring, regardless of HCV infection treatment. ⁷

Berge et al. reported one of the above-mentioned mechanisms of HCC induced by DAAs. As they cause a rapid decrease in HCV RNA levels leading to a fast decline in natural killer cells (NK) activity. ⁸

The study aimed to examine new-onset or relapse of HCC in patients receiving Sofosbuvir and Daclatasvir both with and without Ribavirin.

The study protocol was accepted by the Ethics Committee of the National Hepatology and Tropical Medicine Research Institute [NHTMRI 6-2017], approval date:18/2/2017 in Cairo, Egypt. This research was reported on ClinicalTrials.gov with ID number: NCT03247296. This research was performed following the criteria set out in the Norms of Good Clinical Practice and the Helsinki Declaration. Before enrollment, all patients have been informed of the study methodology and they signed detailed written consent.

This observational study was a six-month observational Prospective study that included 150 adults to detect HCC occurrence in HCV patients treated with SOF, DAC with or without RIB. Patients were recruited from the outpatient clinic of the National Hepatology and Tropical Medicine Research Institute (NHTMRI), Cairo, Egypt.

The study was performed on those who implemented the criteria of inclusion of the National Committee for Control of Viral Hepatitis, Ministry of Health and Population (MOHP), Egypt, and included male and female patients aged 18 to 75 years old, easy to treat group [treatment-naïve patients with PCR positive serum HCV RNA, total serum [bilirubin ≤1.2 mg/dL, albumin ≥3.5 g/dL, INR ≤1.2, and platelet count ≥150,000/mm ³]. And difficult-to-treat group [interferon treatment-experienced, total serum bilirubin <1.2mg/dL, serum albumin <3.5 g/dL, INR >1.2, and/or platelet count <150,000/mm ³]. For an ethical reason, there was no control group for this study because it was immoral to allocate an infected group without care. Also excluded were individuals with inadequately managed diabetes mellitus (HbA1c >9 %), total serum bilirubin, serum albumin, INR, platelet count> 3 mg/dL, >2.8 g/dL, ≥1.7, and <50,000/mm ³ respectively. co-infection with HIV, HBV, any chronic liver disease other than hepatitis C, poorly controlled hypothyroidism, hepatocellular carcinoma with exception of 4 weeks after treatment with no proof of dynamic imaging activity (CT or MRI), extra-hepatic malignancy except after two years of disease-free interval, patients with Child's Paugh C.

Patients’ demographics, laboratory test results, and abdominal ultrasounds reports were collected. Verbally communicated information, via phone or directly from the patients, about the drug side effects were included. Medical records were screened for evidence of medication error and interaction occurrence taking into consideration that all the medication orders were handwritten. 150 patients were allocated into two groups according to their physical examination and lab parameters: difficult-to-treat group taking sofosbuvir/daclatasvir/ribavirin(S/D/R) and easy-to-treat group taking sofosbuvir/daclatasvir (S/D). Figure 1 shows the methodology and primary results in a graphical image.

Lab parameters of the study participants were tested three times. At baseline, all participants were subjected to medical assessment, lab tests as well as quantitative HCV-RNA, fasting blood sugar levels or HbA1C if diabetes present as comorbidity, serum creatinine, CBC, AST, ALT, concentration of prothrombin or INR, total bilirubin, serum albumin, a test of pregnancy (childbearing aged females), alfa fetoprotein (AFP) as an HCC biomarker. Any participants who were men >40 years old, or women >50 years old underwent abdominal ultrasonography and electrocardiogram before start of the treatment.

Virological response to treatment was evaluated using quantitative HCV RNA assessment, by PCR. Laboratory tests for the participants including, serum creatinine, ALT, AST, CBC, HbA1C if diabetic, INR, serum total bilirubin, albumin, AFP. Abdominal ultrasonography was repeated and any suspected focal lesion of the liver was examined with a triphasic CT scan or MRI to investigate the occurrence or the recurrence of HCC at the antiviral treatment end (12 weeks from the start) and SVR 12 (24 weeks from the start).

Direct-acting antivirals (DAA) have effectively produced a new HCV-eradication era. The involvement of DAAs in developing HCC in these patients is still questionable. ⁹ More than one study has documented different findings of the relationship between therapy by the DAAs and emerging HCC. ¹⁰ The findings of those studies were as follows, the previous one from Barcelona stated the HCC relapse in 27.6% of the studied patients after a median follow-up of 5.7 months. While they achieved sustained virological response and had a negative residual HCC before treatment. ¹¹

The rates of 28.8% of HCC recurrence and 3.16% of HCC incidence were the result of an Italian study that included 59 patients with HCC history and 295 patients negative for HCC. ⁷ Another research from France ¹² which included 6000 patients who were treated with interferon (IFN)-free regimens had rebutted both Spanish ¹¹ and Italian reports. Researchers found no raise in the development of HCC and an approximately low risk of recurrence of HCC. ¹³

Concerning HCC incidence in the current study, six patients out of 71 from the SOF/DAC/RIB group had developed HCC with an incidence rate of 8.5% in a mean time 18 weeks from starting the DAAs treatment. These results came in agreement with those reported by Conti et al. who reported HCC incidence of 7.6% in DAA-treated patients. ⁷

On the other hand, Calvaruso et al. found that the incidence of HCC was only 3.5% and this contrary can be attributed to different DAAs regimens used in both studies. ¹⁴

In the present study, the explanation of different outcomes in developing hepatocellular carcinoma between the two groups is that patients in the S/D/R group had more advanced liver disease as shown by their biochemical data. The mean age of patients in the S/D/R group was 53 years old, which was significantly different from those in the S/D group. It is confirmed by the statistical analysis of this study results that the cirrhosis of the six patients is the main cause of their HCC development. This study's point of strength is the regimen detailing in the two groups and accurately illustrating the HCC development in the difficult-to-treat group patients, not the easy-to-treat group which can be a unique finding in Egyptian genotype 4 patients.

Upon studying the follow-up parameters of the patients who developed HCC in the current study it was found that there was an increase in Child scores, ALT, AST, bilirubin, WBCs, INR, and AFP values while there was a decrease in albumin, hemoglobin, and platelets levels, those results came in agreement with those detected by Rewisha et al. ¹³

Concerning the virological response, patients in this study achieved 100% SVR which is greater than the percentages of both Mann et al. (84.9%) and Pariente et al. (91.1%); this difference in results may be attributed to the genotype difference of the patients and their response to the Sof/Dac regimen. ^{15 , 16}

Concerning the biochemical parameters of the patients in the two groups, the comparison resulted in significantly lower values in SOF/DAC group than SOF/DAC/RIB group in child score, bilirubin, INR, and AFP with P values <0.05. On the contrary, the SOF/DAC/RIB group showed significantly lower values than the SOF/DAC group in albumin, WBCs, hemoglobin, platelet, and glycated hemoglobin levels with P values <0.05. Those biochemical values were comparable to those reported by Welzel et al. but, the bilirubin values between the two groups were equal. The drop in hemoglobin levels can be attributed to the fact that Ribavirin resulted in hemolytic anemia through direct oxidative damage followed by a decreased lifespan of the RBC. ^{17 , 18}

A significant outcome of this research was the discovery of reduced AFP levels following treatment with DAAs; similar to those observed by Stine et al. and, as a result of their findings, they proposed a future study that AFP could be considered as a biomarker for the probability of SVR and indicated that AFP should be collected earlier than planned during therapy ( e.g. week 4) rather than a viral load. ¹⁸

Serum creatinine didn’t show any significant change between groups which confirming the safe use of sofosbuvir-based regimens on kidney function and consequently their use in patients with chronic kidney disease patients as mentioned by Sise et al. ¹⁹

It’s worth mentioning a case reported by Ahmed M. who reported that harvoni (which also contains sofosbuvir) induced kidney function deterioration in a patient with normal kidney function, which keeps monitoring kidney functions while treating HCV patients an important issue. ²⁰

After analyzing the data resulted in this study, we concluded that DAAs don’t raise the risk of developing new incidence or recurrence HCC. The developing HCC risk is increased with cirrhosis, So close monitoring of cirrhotic patients receiving DAAs is required. Other different studies from different geographical areas reported conflicting conclusions about the relation of incidence or recurrence of HCC after DAAs treatment although the SVR achievement in some of those patients. So the close monitoring of patients who will be assigned to the difficult-to-treat group is becoming mandatory.

This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.