Does histology (e.g., lobular vs ductal) impact your decision to offer omission of RT to women with breast cancer who are otherwise candidates?

Histology doesn't influence me as long as IHC is favorable (although with 5 fraction RT, it is easier for patients to get to treatment than to observe).

LCIS in specimen doesn't influence my decision as well.

Although no tumor on ink is adequate for patients getting RT, that may not be true for the om...