Hmm, not sure about retroactive claims, although I'm sure you can find that out easily enough. Bear in mind also, that just going back an forth to the radiation center, back-ups and delays can keep you away from work as well as wear you out, let alone the side effects! I think you should definitely ask your medical team what they think since they can factor in the type of job you have, your overall health and how they anticipate the treatment will go.

Stage IV SCC lt lateral tongue, surgery 5/19/08 (partial gloss/upper neck dissection left side/radial free flap reconstruction) IMRT w/weekly Cisplatin & Erbitux 6/30/08, PEG 1 6/12/08 - out 7/14 (in abdominal wall, not stomach), PEG 2 7/23/08 - out 11/20/08, Tx done 8/18/08
Second SCC tumor, Stage 1, rt mobile tongue, removed 10/18/2016, right neck dissection 12/9/2016
Third SCC tumor, diagnosed, 4/19/2108, rt submandibular mass, HPV-, IMRT w/ weekly Cisplatin, 5/9 - 6/25/2018, PEG 3 5/31/2018