Dec 22 (Reuters) - Helix Biopharma Corp HBP.TO :
* Helix Biopharma Corp announces the signing of a non-binding letter of intent with Promab Biotechnologies to develop cell based therapies
* Helix Biopharma - LOI calls for both cos to complete a due diligence and establish a collaboration to develop chimeric antigen receptor t cell therapy Source text for Eikon: ID:nMKW5wFpPa Further company coverage: HBP.TO