Bloc Québécois MP Francine Lalonde, seen here during Question Period in the House of Commons in March 2009. The veteran MP has bone cancer and is planning to leave politics. ((Adrian Wyld/Canadian Press))

Veteran Bloc Québécois MP Francine Lalonde has announced she won't run in the next federal election because she has bone cancer.

The 70-year-old said the cancer she battled a few years ago has returned and is progressing rapidly.

Lalonde fought back tears as she made the announcement at a press conference in Montreal on Monday after a Bloc caucus meeting. 

She represents the Pointe-de-l'Île riding in Montreal's east end and was first elected to the House of Commons in 1993.

Lalonde made a name for herself in politics after introducing a private member's bill that would allow euthanasia and assisted suicide under strict conditions.

Bill C-384 was defeated 228-59 in a vote earlier this year.

Lalonde said she will stay on until the next federal elections.