Question: is this a 2) strong advice, 1) weak advice 0) no advice?

Although NP is not uncommon in cancer patients, only a small number of clinical research trials have specifically assessed analgesic drugs for cancer patients with NP (Caraceni et al., 2004; Mercadante, Arcuri, Tirelli, Villari, & Casuccio, 2002). 
user
This is no advice
assistant