Hi, Thanks for writing in. Sorry to hear about your husband who is having hepatocellular cancer. There is probably a blood clot which has developed in the IVC which is a great vein transporting blood to the right chamber of the heart. This is a serious concern and I hope you have discussed the matter with allopathy doctors and treatment might have been started to dissolve the clot. The problem happens when such a clot reaches the lung through the heart and causes complete occlusion of pulmonary artery leading to lungs not receiving blood for oxygenation. If your husband develops breathlessness then please take him to the hospital immediately. Ayurveda does not have any confirmed research on the treatment of hepatiocellular carcinoma in my knowledge. It is important to keep in mind that the blood clot in IVC should be dissolved to extend his life using allopathy medicine and prevent sudden complications. Please do not worry.