- All forms of prior local therapy are allowed as long as patients have either a target lesion, which has not been treated with local therapy and/or the target lesion(s) within the field of the local-regional therapy has shown an increase of ≥ 20% in size. Local-regional therapy must be completed at least 4 weeks prior to the baseline CT scan. Local therapies including chemoembolization do not count as prior systemic therapy.