Overall survival (OS) is defined as the time from the study entry until the date of death irrespective of cause. Patients who have not died at the time of end of the whole study , and patients who are lost to follow up , will be censored at the date of the last contact.

Event Free Survival (EFS) is measured from the time from study entry to any treatment failure including disease progression, or discontinuation of treatment for any reason (eg, disease progression, toxicity, patient preference, initiation of new treatment without documented progression) or death from any cause.

Remission rate (RR) is defined as the number of complete and partial remission (CR and PR) after the completion of the first line of treatment.

Will be collected the risk factors potentially associated to the outcome of indolent non follicular lymphomas (clinical status, biochemistry, hemochrome, HCV, HBV and autoimmnity markers). Will be collected the risk factors potentially associated to the outcome of indolent non follicular lymphoma (clinical status, biochemistry, hemochrome, HCV, HBV and autoimmunity markers). Those risk factors will be utilized to obtain a prognostic model (prognostic index) from the Cox proportional hazard regression and, finally, a prognostic score grouping the prognostic index in at least three group of risk (low, intermediate, high risk).

In WW group the start of treatment will be treated as a time-varying covariate in Cox proportional hazard regression.

Remission rate (RR) is defined as the number of CR and PR after the second and subsequent lines of therapy, due to progression disease.