Research has shown that early palliative care in cancer care is associated with improved symptom management, better prognostic understanding, improved quality of life for patients and family caregivers, and even improved survival. Yet, in spite of the proven benefits of integration of palliative care in oncology, it has been well established that patients with hematologic malignancies and those undergoing cellular therapy (hematopoietic stem cell transplantation (HSCT) and chimeric antigen receptor (CAR) T-cell therapy) do not routinely receive palliative care. Most of the published research on the early integration of palliative care in oncology describes studies that have involved patients with solid tumours. To date, only one randomized trial examining the impact of integrated palliative care among patients undergoing HSCT has been published and there have been no studies examining the impact of integrated palliative care for patients undergoing CAR T-cell therapy. The American Society of Clinical Oncology recommends early palliative care for patients with advanced cancers or for those with high symptom burden. Patients with blood cancers experience high symptom burden and in the last 30 days of life, compared to patients with solid tumours, patients with blood cancers are more likely to die in hospital, have more intensive care unit admissions, have prolonged hospitalizations (\>14 days), and pass away in an acute care facility. There is an urgent need to proactively address suffering throughout cellular therapy trajectories, even before treatment starts, so that patients and caregivers are not inevitably waiting for symptoms to arise before they can be addressed and to optimize quality of life for patients undergoing transplant as well as their family caregivers. PALS\_CT will compare early palliative care to standard care for patients and their family caregivers undergoing HSCT or CAR T-cell therapy for blood cancers.