Wellingborough MP Peter Bone pleaded for help for a five-year-old constituent suffering from a rare form of cancer.
Mr Bone highlighted the case of Zac Knighton-Smith, who has been diagnosed with neuroblastoma, a cancer of the nervous system that spreads rapidly through the body.
Mr Bone said the five-year-old was one of six children in the country that had just missed out on being included in a major clinical trial of antibody therapy.
His family are trying to raise £250,000 so Zac can be treated in the US.
Mr Bone said: "The government spends £100bn on the NHS a year - funding for these half a dozen children would be a drop in the ocean."
Health Minister Ann Keen said a formal application should be made to Zac's local PCT to see if funding could be found.