Raven, I think there are degrees of depression. If the meds don't work he certainly needs to push it with the therapist. I don't know if severe depression is a normal part of this cancer diagnosis/treatment process. There's usually great anxiety and some depression but if the depression is deep and lasting, appropriate measures need to be taken. I have taken anti-depressants for some time but they don't work when things get extreme. That is when you need extra help.

1996, ovarian cancer surgery + cisplatin and taxol.
September, 2007, SCC of left lateral tongue. Excision.
October, 2009 recurrence in scar tissue, T1NOMO. Free flap surgery from left wrist - neck dissection. 63 year old New Zealander. No chemo, no RT.
February, 2014. New primary in left buccal mucosa. Marginal mandibulectomy, neck dissection, right arm free forearm flap. T1N0M0 but third occurrence and some areas of concern: RT started 8 April and finished 19 May.