Phase I Trial of Afatinib and Trastuzumab in HER2 Overexpressing Cancer.

Maximum Tolerated Dose (MTD) of Afatinib in combination with trastuzumab based on the number of patients with dose limiting toxicity (DLT) during the first treatment cycle (Dose escalation part). The MTD was defined as the highest dose studied at which the incidence of a DLT was less than 17% (i.e. 1/6 patients) during the first cycle. One patient in the Afa30+Trast8 cohort developed tumour lysis syndrome during the first course of treatment and was therefore not evaluable for the primary endpoint.

Number of Patients With Dose Limiting Toxicity (DLT) occurring during Cycle 1 based on the investigator assessment. One patient in the Afa30+Trast8 cohort developed tumour lysis syndrome during the first course of treatment and was therefore not evaluable for the primary endpoint.

BOR represents the best response a patient had during their time in study from start of treatment until progression, the last evaluable assessment in absence of progression or start of subsequent anticancer therapy. For patients that died, BOR was to be calculated based on data up to last evaluable RECIST,v1.1 assessment prior to death. Death did not contribute as PD for BOR. As per RECIST v1.1 for target lesions (TL) & assessed by MRI: CR: Disappearance of all TL,all non-TL, & no new lesion. Any pathological lymph nodes must have had reduction in the short axis to <10 mm. PR: At least 30% decrease in sum of the longest diameter (SLD) of TL taking as reference the baseline SLD. PD: At least a 20% increase in SLD of TL taking as reference the smallest SLD recorded since treatment started, together with an absolute increase in SLD of at least 5mm. SD: Neither sufficient shrinkage to qualify for PR, taking as reference the baseline SLD, nor sufficient increase to qualify for PD.

Objective Response (OR) was defined as best overall response of complete response (CR) or partial response (PR), where best overall response was determined according to Response Evaluation Criteria In Solid Tumors (RECIST) version 1.1 from first administration of study medication until the earliest of disease progression, death or last evaluable tumour assessment before start of subsequent anti-cancer therapy. As Per RECIST v1.1 for target lesions (TL) & assessed by MRI: CR: Disappearance of all TL,all non-TL, & no new lesion. Any pathological lymph nodes must have had reduction in the short axis to <10 mm. PR: At least 30% decrease in sum of the longest diameter (SLD) of TL taking as reference the baseline SLD.

Clinical benefit was defined as best overall response of CR or PR or stable disease (SD) where best overall response is defined according to RECIST version 1.1 from first treatment administration until the earliest of disease progression, death or last evaluable tumour assessment before start of subsequent anti-cancer therapy. As Per RECIST v1.1 for target lesions (TL) & assessed by MRI: CR: Disappearance of all TL,all non-TL, & no new lesion. Any pathological lymph nodes must have had reduction in the short axis to <10 mm. PR: At least 30% decrease in sum of the longest diameter (SLD) of TL taking as reference the baseline SLD. SD: Neither sufficient shrinkage to qualify for PR, taking as reference the baseline SLD, nor sufficient increase to qualify for PD.