How would you show your concern towards a cancer patient?

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A few weeks ago my father gave me the bad news that my 55 year old aunt has been diagnosed with a cancer. She is currently undergoing chemotherapy. As a family we do care about each other but we are not the type of calling each other or visit each other houses often. But we are always there for each other in times of need. I found it difficult to pick up the phone and give them a call them to let them know that I heard the news. I was speechless and ended up by not calling since I found it really difficult what to say. Last week I was shopping at a supermarket when I met my aunt and uncle coming out from a lift. We stayed talking for half an hour, and my aunt who seemed in good spirit tried to explain what she is going through. If you heard that a close relative is suffering from an illness would you call? What would you say? How would you show your concern?