Koirala, who has done many memorable films after debuting with "Saudagar" in 1991, said it was "shocking" to learn about her ailment, but she said she has learnt her lessons from her painful struggle to survive the disease.
"Earlier I used to fall apart and crumble even while facing small challenges in life. But I had no choice this time. I had to face the situation positively and be brave and have faith in myself.
The actor was attending a programme, "Hausla- Fight against Cancer" here organised by NGO Grameen Sneh Foundation.
She said she tries to motivate other patients to have hope and get the best treatment they can.
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"When I meet cancer patients, the only thing that I tell them is to get a better medical treatment. Every decade is a change of experience and mindset. In today's world there are many examples of cancer survivors. So one must have hope," she said.
Under the programme, she is also promoting a mobile application, Sneh Cancer App, for easy interactions between cancer patients and their doctors.
According to Sneha Routray, president of Grameen Sneh Foundation, said more than 900 cancer patients have benefitted from the programme.
"We have been running this programme in rural areas where we screen people and make them aware about the disease. Lack of information is one of the main reasons behind the increase in number of cancer patients," she said.