Actor Vivek Oberoi says he lost his childhood sweetheart to cancer when he was 18.

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"When I was just 18, I lost my first love. My childhood sweetheart since the age of 13 died of cancer," he wrote on his Twitter page.

The actor, who is the brand ambassador of Cancer Patients Aid Association (CPAA), says by helping those who cannot afford treatments he feels he's honouring his late girlfriend.